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Byte Buddy release notes

1. May 2022: version 1.12.10

  • Correctly resolve temporary folder, if custom folder is set, on Linux during emulated attach.
  • Attempt guessing if Graal automatic configuration agent for native image is run.
  • Avoid hard-coded dependencies to classes of java.management module.
  • Do not include OSGi info in Byte Buddy source module.

7. April 2022: version 1.12.9

  • Add support for Java 19.
  • Add basic support for Graal native image.
  • Add option for strongly referenced cache keys.
  • Reduce access requirements for fields from Advice.

10. February 2022: version 1.12.8

  • Make Step type in MemberSubstitution public as intended.
  • Add factory that uses ArrayDeque instead of LinkedList if the used JVM supports it (Java 6+).
  • Fix resolution of internal names for arrays in TypeReferenceAdjustment.

15. January 2022: version 1.12.7

  • Adjust warm-up API to return warmed-up byte code.
  • Check release property in Byte Buddy Maven plugin.
  • Propagate exception from Byte Buddy's class file transformer to improve wrapping behavior.
  • Avoid loading of ElementType when checking compatibility as the current VM might not provide all constants.
  • Allow for disabling stack adjustment as it might not always be possible.
  • Make stack adjustment more robust when goto targets contain stack values.

20. December 2021: version 1.12.6

  • Mark argument for equals method as @MaybeNull.
  • Mark argument for ElementMatcher as @UnknownNull.

16. December 2021: version 1.12.5

  • Add alias annotations to avoid compilation warnings for optional findbugs dependency.
  • Adjust HashCodeEqualsPlugin to allow for inclusion of custom annotation type on equals method parameter.

15. December 2021: version 1.12.4

  • Make paths in Gradle plugin relative and therewith cachable.
  • Add explicit check for empty or non-existent source folder to Maven and Gradle plugins.
  • Add support for modules when accessing system class loader for Nexus or Installer.
  • Add nullability annotations to all type members which are nullable and declare non-nullability the default.

2. December 2021: version 1.12.3

  • Move configuration for Java version to extension and avoid implicit configuration during task execution to allow for using a configuration cache.
  • Make fail last the alternative to fail fast instead of not failing the build. Enable fail fast by default in the Gradle plugin.
  • Use instrumented type in MemberSubstitution to include newly added properties in its description.

22. November 2021: version 1.12.2

  • Improve error message when class file version is not supported.
  • Avoid duplication of fields to store auxiliary objects.
  • Fix Gradle plugin to be skipped when input files are empty.
  • Resolve dynamic bootstrap constant type correctly.

9. November 2021: version 1.12.1

  • Fix binary incompatibility in BaseNameResolver for suffixing naming strategy.
  • Introduce caller sensitive base name resolver for suffixing naming strategies and use it as default if Graal native image property is discovered.

5. November 2021: version 1.12.0

  • Introduce detection for Graal native image execution.
  • Correctly resolve interface implementations in revers order when compiling method graph.
  • Adjust lambda instrumentation strategy to support Java 17.

29. October 2021: version 1.11.22

  • Remove automatic frame padding mechanism in favor of explicit NOP instruction after injected blocks.

18. October 2021: version 1.11.21

  • Allow Advice.PostProcessor to emit frames.
  • Add possibility for Advice.AssignReturned to suppress exceptions.
  • Add frame when rebasing constructors to avoid breakage if frames are assumed prior to super constructor call.

11. October 2021: version 1.11.20

  • Add option for AsScalar annotation to assign default value instead of ignoring it.
  • Add transform-runtime goal to Byte Buddy Mojo to allow for running plugins with runtime class path included.

5. October 2021: version 1.11.19

  • Add Advice.AssignReturned post processor to allow for assigning values from Advice that uses delegation rather than inlining.
  • Allow for declaring Advice.Local values from both enter and exit advice.
  • Add option for using runtime class path rather than only compile scope from Byte Buddy Maven plugin.
  • Avoid loading of annotation proxies within Byte Buddy's internal API.
  • Add plugin to add Java Repeatable annotations without requiring a JDK 8+.

23. September 2021: version 1.11.18

  • Avoid binary incompatibility due to signature change by reintroducing method overload.
  • Use plugin to add annotations for dispatcher methods to avoid breakage when using obfuscators.

22. September 2021: version 1.11.17

  • Better error message upon attachment failure due to overridden attach socket.
  • Retain label order for instructions in Advice to avoid incorrect offsets in stack map frames.
  • Change MethodGraph.Compiler API to accept generic types.
  • Add plugin to add Proxied annotations to all proxied methods of a dispatcher. This avoids problems in obfuscators.
  • Fix resolution of type initializer in a Nexus.

17. September 2021: version 1.11.16

  • Avoid naming conflicts when adding super and default method delegation for the same method using MethodDelegation.
  • Fix module visibility for Invoker to avoid breakage if Byte Buddy is shaded into another module with different package exports.

2. September 2021: version 1.11.15

  • Add net.bytebuddy prefix to Byte Buddy specific privileges.
  • Rework JavaDispatcher to require specific privilege but use Byte Buddy's protection domain for dispatchers, once acquired.

31. August 2021: version 1.11.14

  • Adjust InvocationHandlerAdapter to use null for methods without parameters as specified by contract.
  • Offer option to use null for MethodDelegation and Advice if method has no parameters.
  • Add method to seal unsealed class loaders after the fact.
  • Use correct type for resolving security manager method in ByteBuddyAgent.

18. August 2021: version 1.11.13

  • Introduce warmUp to further avoid circularities when using AgentBuilder.
  • Fix ignore matcher of AgentBuilder to include jdk.internal.reflect package by default.

6. August 2021: version 1.11.12

  • Always use reflection and not a JavaDispatcher when a method potentially checks the access context via a security manager.

5. August 2021: version 1.11.11

  • Do not pollute access context for security manager when defining classes via a method handle lookup.

4. August 2021: version 1.11.10

  • Added option for Gradle plugin to register adjustmentPostProcessor to manually add task dependencies.

27. July 2021: version 1.11.9

  • Include jdk.reflect package in default ignore matcher.
  • Retain parameter names for constructor of Java record as it is done by javac.
  • Throw NoSuchTypeException on non-resolved types rather then IllegalStateException.
  • Weaken visibility checks for fields set by MethodCall.

15. July 2021: version 1.11.8

  • Fix package exposure for JavaDispatcher class when Byte Buddy is used as a module.

14. July 2021: version 1.11.7

  • Introduce a more complex error handler for Gradle builds in favor of strict mode.
  • Include method for reading all loaded Class values of a loaded dynamic type.
  • Include Byte Buddy version in module-info.
  • Fix package list in module-info.

2. July 2021: version 1.11.6

  • Add fallback for JavaDispatcher that works on Android and other platforms that do not support dynamic class definitions.
  • Make Gradle task dependency resolution more robust and configurable.
  • Update ASM and support Java 18 without experimental configuration.

19. June 2021: version 1.11.5

  • Remove AccessController API to replace with weaved access control via AccessControllerPlugin.

19. June 2021: version 1.11.4

  • Add constant for Java 18
  • Improve constructor resolution for Plugins.
  • Add convenience method for translating TypeDescription.Generic to a builder.
  • Add convenience method for resolving an annotation property from a property name.

18. June 2021: version 1.11.3

  • Introduce AccessControllerPlugin to weave use of AccessController only if available.
  • Fix use of incorrect type when chaining InvokeDynamic.
  • Better emulate visitation order of ASM when creating types.
  • Avoid writing duplicate entries for submitted subtypes in sealed types.
  • Better encapsulate JavaDispatcher utility.
  • Add frame padding to initialization handler when redefining or rebasing a class.
  • Do not assume that TypeVariables are AnnotatedElements to support Java 7 and earlier.

11. June 2021: version 1.11.2

  • Fixes resolution of array types for Java descriptors of JavaConstant.
  • Properly process Android's version string and avoid relying on the version string where possible.
  • Allow for self-calls when creating a MethodCall and identifying a method via a matcher.

1. June 2021: version 1.11.1

  • Add JNA based ClassInjector for use if JNA is already available.
  • Allow HashCodeEqualsPlugin to derive hash code from instrumented type rather then lowest type in hierarchy.
  • Retain this variable name for index 0 when using advice with remapped locals.
  • Rework AnnotationDescription for TypePool to mirror JVM behavior if annotation properties are changed inconsistently.
  • Add several StackManipulations for common operations.
  • Remove unwanted dependency to Instrumentation API from JavaModule type.
  • Rework use of reflection to use JavaDispatcher API which also allows for custom generation of proxies without use of reflection.
  • Fully rework JavaConstant API to integrate with Java's ConstantDesc API and to allow for production of such descriptions.
  • Fix different bugs to properly support representation sealed classes.

19. April 2021: version 1.11.0

  • Rework resubmission strategy to allow for immediate resubmission or on error.
  • Fix type for constructor call when setting field in MethodCall.
  • Include thread in default agent logger.
  • Add compound property to InvocationHandlerAdapter.
  • Flatten conjunction and disjunction matchers.
  • Add method to get possibly known class file version of TypeDescription.
  • Correctly consider generic array type when computing erasure.

9. March 2021: version 1.10.22

  • Refactor JavaConstant API and fix handle resolution.
  • Adjust bootstrap method validation to account for possible dynamic constants.
  • Make class loaders parallel capable.
  • Correct code for attaching to Windows VMs with 32 bit.
  • Allow configuration for Gradle plugin to consider class path as incremental.

21. February 2021: version 1.10.21

  • Update ASM and add support for Java 17.
  • Make plugin discoverability configurable.
  • Add advice suppression handler for rethrowing.

3. February 2021: version 1.10.20

  • Reuse simple but commonly used matchers as constants to avoid repeated allocation.
  • Allow build plugins to be discovered from a plugin's class path.
  • Do not use cached version of classes that are currently transformed.
  • Allow using an incremental class path for build plugins in Gradle.
  • Fix filter applied to declared, non-virtual methods in MethodCall.

21. December 2020: version 1.10.19

  • Fix constructor type resolution in MethodCall.
  • Add support for incremental builds to Byte Buddy Maven plugin.
  • Correctly handle empty, primitive arrays as annotation properties in TypePool.
  • Improve matching of rebaseale methods by using signature tokens rather then full tokens.
  • Use get as prefix for getters of Boolean wrapper properties.
  • Consider types in net.bytebuddy.renamed package in Byte Buddy agent.
  • Set names for all cached variables.
  • Do not fail validation for generic properties in Java 1.4 class files since they can be legally contained due to JSR14.

1. November 2020: version 1.10.18

  • Fixes descriptor used for method handle constant of field.
  • Fixes assignability check for varargs.
  • Allow using static interface methods for bootstraping.
  • Allow providing null to setsValue for field assignment.
  • Cleans up providing of constant arguments as type description, enum or constant.
  • Support getPackage in legacy class loaders.
  • Allow method call by matcher on private method of instrumented type.

7. October 2020: version 1.10.17

  • Adjust Gradle plugin to properly consider registration order with the Java plugin.
  • Correct task adjustment when using Byte Buddy in a multimodule project.

23. September 2020: version 1.10.16

  • Update to ASM 9 for full support of sealed types.

19. September 2020: version 1.10.15

  • Rewrite of Gradle plugin, including support for incremental builds.
  • Fix MethodCall bug when loading arguments from array.
  • Mark rebased methods private final as required by the JVM when using a native method preifx.
  • Fix stack excess monitoring when using advice to discover excess stack values correctly to avoid verifier error.

31. July 2020: version 1.10.14

  • Fix build config to include Eclipse e2e file.
  • Allow for not printing a warning if no file is transformed in build plugin.
  • Fix invokability check in MethodCall validation.
  • Avoid premature validation of InstrumentType's method modifiers.
  • Use type cache by default when using loaded type class pool since class lookup showed to be rather expensive.

27. June 2020: version 1.10.13

  • Add possibility to filter class loaders before attempting to load a class using the AgentBuilder's resubmission feature.
  • Add nameOf matcher for more efficient string matching based on a hash set.

18. June 2020: version 1.10.12

  • Experimental support for Java 16.
  • Support all constant pool constant types in all APIs.
  • Adjust methods for bootstrap arguments to allow types of constantdynamic constants.
  • Correctly resolve handle type for method handles on private constructors.
  • Fix stack size computation for minimal methods in Advice.

4. June 2020: version 1.10.11

  • Emit full frame after super or auxiliary constructor call in constructors if no full frame was already issued within this constructor.
  • Support methods that start with a stack map frame before any code.
  • Pop array after @AllArguments parameter.
  • Fix source inclusion for ASM commons.
  • Avoid resolution of detached types when replacing target types in generic arrays on members of instrumented types.
  • Fix validation of member substitution.
  • Include post processor for Advice.

29. April 2020: version 1.10.10

  • Update ASM to 8.0.1
  • Close Dex files in Android class loader.
  • Add abstraction for advice dispatcher to allow for use of invokedynamic.
  • Properly handle incompatible type changes in parsed annotations.
  • Add support for Java records.

29. March 2020: version 1.10.9

  • Add validation for interface method modifiers.
  • Correct discovery of MacOs temp directory for Byte Buddy Agent VirtualMachine.
  • Add parallel processor for Byte Buddy build engine.
  • Add preprocessor for Byte Buddy build engine.
  • Explicitly load Java's Module from boot loader to avoid loading pseudo compiler target bundled with NetBeans.
  • Add convenience method for creating lookup-based class loading strategy with fallback to Unsafe for Java 8 and older.
  • Add caching for method, field and parameter description hashCode methods.

16. February 2020: version 1.10.8

  • Adjust use of types of the java.instrument module to avoid errors if the module is not present on a JVM.

21. January 2020: version 1.10.7

  • Correct discovery of old J9 VMs.
  • Correct invocation of AgentBuilder.Listener during retransformation.
  • Allow forbidding self-attachment using own artifact.
  • Add possibility to patch class file transformers.
  • Fix equality check for float and double primitives.
  • Add guards for annotation API to handle buggy reflection API with mandated parameters.
  • Update ASM.

19. December 2019: version 1.10.6

  • Add experimental support for Java 15.
  • Allow AndroidClassLoadingStrategy to work with newer API level.

11. December 2019: version 1.10.5

  • Fixes Gradle plugin release to include correct dependency.
  • Fixes source jar release for shaded byte-buddy artifact.

28. November 2019: version 1.10.4

  • Throw exception upon illegal creation of entry-only advice with local parameters to avoid verify error.
  • Remove escaping for execution path on Windows with spaces for Byte Buddy agent.
  • Fix J9 detection for older IBM-released versions of J9 in Byte Buddy agent.

8. November 2019: version 1.10.3

  • Allow overriding the name of the native library for Windows attach emulation.
  • Use correct type pool in build plugin engine for decorators.
  • Fix attach emulation for OpenJ9 on MacOS.

16. October 2019: version 1.10.2

  • Upgrade ASM to version 7.2.
  • Improve class file version detection for class files.
  • Check argument length of Windows attach emulation.

9. August 2019: version 1.10.1

  • Extend VirtualMachine API emulation.
  • Reopen socket for POSIX-HotSpot connections after each command being sent to avoid broken pipe errors.
  • Only use JNA API that is available in JNA versions 4 and 5 for better compatibility.
  • Include correct license information in artifacts.
  • Add injection API based on jdk.internal.misc.Unsafe to support agents on platforms that do not include jdk.unsupported.
  • Add AgentBuilder.InjectionStrategy to allow usage of internal injection API.
  • Open package in AgentBuilder if from and to edges are added.

3. August 2019: version 1.10.0

  • Add API for loading native agents from Byte Buddy agent.
  • Extend VirtualMachine API to include other methods.
  • Fix error handling in VirtualMachine API.
  • Fix temporary folder resolution for VirtualMachine API.
  • Add API for MemberAttributeExtension.
  • Rework of AnnotationDescription API to emulate JVM error handling for incorrect or inconsistent values.
  • Add generic type-aware Assigner.
  • Fix method handle-based injector for Java 14.

27. July 2019: version 1.9.16

  • Add support for attach emulation on Solaris.
  • Fix JNA signatures for attach emulation on POSIX.
  • Add standard call conventions for Windows JNA calls.

21. July 2019: version 1.9.15

  • Add emulated attach mechanism for HotSpot on Windows and for OpenJ9/J9 on POSIX and Windows (if JNA is present).
  • Reimplement POSIX attach mechanism for HotSpot to use JNA (if present).

8. July 2019: version 1.9.14

  • Add Java 14 compatibility.
  • Refactor emulated attach mechanism and use JNA in order to prepare supporting other mechanisms in the future.
  • Reinterrupt threads if interruption exceptions are catched in threads not owned by Byte Buddy.
  • Refactor class file dumping.
  • Publish Gradle plugin to Gradle plugin repository.

24. May 2019: version 1.9.13

  • Added matcher for super class hierarchy that ignores interfaces.
  • Extend API for member substitution.
  • Minor API extensions.

26. March 2019: version 1.9.12

  • Fixed stack map frame generation during constructor advice.
  • Improves frame generation for cropping-capable frames.

21. March 2019: version 1.9.11

  • Remove field reference in injected class due to possibility of loading Byte Buddy on the boot loader.
  • Updated to ASM 7.1.
  • Fix unsafe injection on Java 12/13.

11. February 2019: version 1.9.10

  • Fixed ByteArrayClassLoader when used from boot class loader.
  • Fixed shading to include ASM class required during renaming.

4. February 2019: version 1.9.9

  • Properly interrupt resubmission process in agent builder.
  • Fix visibility checks for nest mates.

24. January 2019: version 1.9.8

  • Extend MethodCall to allow for loading target from StackManipulation.
  • Allow for injection into MultipleParentClassLoader.
  • Performance improvement on array creation.
  • Allow for custom strategy for visibility bridge creation.

10. January 2019: version 1.9.7

  • Retain native modifier when defining a method without method body.
  • Allow appending class loader to multiple parent class loader with hierarchy check.
  • Add support for Java 13.
  • Extend experimental property to allow for detection of unknown versions.

13. December 2018: version 1.9.6

  • Add the JVM extension / platform class loaders to the default excludes for the AgentBuilder.
  • Refactor MethodCall to better reuse intermediates. This implies some API changes in the customization API.
  • Add hook to AgentBuilder to customize class file transformer.

22. November 2018: version 1.9.5

  • Fixed lookup injection for classes in the default package in Java 9.

13. November 2018: version 1.9.4

  • Add API for explicit field access from FieldAccessor.
  • Fix stack size adjustment for custom MemberSubstitutions.
  • Performance improvement for classes with many methods.

28. October 2018: version 1.9.3

  • Update to ASM 7.0 final
  • Improve field setting capabilities of FieldAccessor and MethodCall.

15. October 2018: version 1.9.2

  • Allow for delegation to method result for MethodDelegation.
  • Extend MemberSubstitution to allow for delegating to matched member.
  • Create multi-release jar for module-info carrying artifacts.
  • Properly handle directory elements in plugin engine with in-memory or folder target.

5. October 2018: version 1.9.1

  • Minor API change of Plugin.Engine.Source to allow for closing resources that need to be opened.
  • Reinstantiate class injection on Java 12 with new Unsafe use.
  • Allow for disabling use of Unsafe alltogether.
  • Adjust Gradle build plugin to use closure for argument instantiation.
  • Prepare method arguments on MethodCall.

29. September 2018: version 1.9.0

  • Update to ASM 7 for non-experimental Java 11 support.
  • Reduce byte code level to Java 5.
  • Add module-info.class for byte-buddy and byte-buddy-agent artifacts.
  • Extend ClassInjector API to allow supplying string to byte array mappings.
  • Add visitor to allow adjustment of inner class attribute.
  • Refactor agent builder API to use decoration by default and rather require explicit termination.
  • Add Plugin.Engine to allow simple static enhancements and rework build plugins for Maven and Gradle to use it.
  • Refactor AsmVisitorWrapper.ForDeclaredMethods to only instrument methods on .method but offer .invokable for anthing.

8. September 2018: version 1.8.22

  • Add guard to EnclosedMethod property upon redefinition to avoid error with Groovy which often gets the propery wrong.
  • Add possibility to sort fields in plugin-generated equals method.
  • Add class file locator for URL instances.

3. September 2018: version 1.8.21

  • Added caching for expensive methods of reflection API.
  • Fix treatment of inner class attributes for redefinition and rebasement.
  • Extend build plugin API to achieve better Java agent compatibility.
  • Add convenience API for creating lambda expressions.

29. August 2018: version 1.8.20

  • Fix decoration to include non-virtual methods.
  • Add build plugin for caching the return value of a method.

28. August 2018: version 1.8.19

  • Fix annotation handling in decorator strategy.
  • Several minor bug fixes for MethodCall.
  • Fix shading for signature remapper.

27. August 2018: version 1.8.18

  • Add API for defining inner types and nest mate groups.
  • Add decoration transformer for more efficient application of ASM visitors.
  • Allow chaining of MethodCalls.
  • Prohibit illegal constructor invocation from MethodCalls.

6. August 2018: version 1.8.17

  • Fix class loader injection using putBoolean.
  • Do not set timeout for Unix attach simulation if value is 0.
  • Avoid incorrect lookup of getDefinedPackage on Java 8 IBM VMs.
  • Fix type checks on constantdynamic support.

3. August 2018: version 1.8.16

  • Add support for dynamic class file constants for Java 11+.
  • Suppress lazy resolution errors within MemberSubstitution::relaxed.
  • Generalize method matcher for clone method.
  • Add toString method to ClassFileVersion.
  • Reenable ClassFileInjection.Default.INJECTION in Java 11+ via fallback onto Unsafe::putBoolean.

26. July 2018: version 1.8.15

  • Add preliminary support for Java 12.

24. July 2018: version 1.8.14

  • Query explicitly added class loaders before the instrumented class's class loader in advice transformer for an agent builder.
  • Add nullcheck for Instrumentation::getAllLoadedClasses.
  • Allow for access controller-based lookups for Method constants.
  • Use getMethod instead of getDeclaredMethod for method lookup if possible.

5. July 2018: version 1.8.13

  • Update to ASM 6.2
  • Reinstate support for latest Java 11 EA if net.bytebuddy.experimental is set.
  • Fix edge completion for AgentBuilder.
  • Dump input class file if the net.bytebuddy.dump is set.
  • Add convenience chaining methods to Implementation.Compound.
  • Fix nestmate changes in method invocation.

25. May 2018: version 1.8.12

  • Fix misrepresentation of default package as null.
  • Add Advice.Exit annotation and allow for method repetition based on exit advice value.
  • Add Advice.Local annotation to allow for stack allocation of additional variables.
  • Improve advice's method size handler.

4. May 2018: version 1.8.11

  • Avoid shading unused ASM classes with incomplete links what breaks lint on Android and JPMS module generation.

28. April 2018: version 1.8.10

  • Extended support for self-attachment by using current jar file for Java 9+.
  • Minor performance improvements.

27. April 2018: version 1.8.9

  • Several performance improvements.
  • Adjust toString implementation for parameterized types to the changed OpenJDK 8+ behavior.
  • Attempt self-attachment using the current jar file.

20. April 2018: version 1.8.8

  • Use cache for loaded TypeDescription to avoid overallocation.
  • Generalize exception handler API for Advice.

19. April 2018: version 1.8.7

  • Added ClassWriterStrategy that allows controlling how the constant pool is copied.

18. April 2018: version 1.8.6

  • Introduced concept of sealing the InjectionClassLoader to avoid abuse.
  • Avoid class loader leak by not storing exceptions thrown in class initializers which can keep references to their first loading class in their backtrace.
  • Add ClassFileBufferStrategy to agent builder.
  • Retain deprecation modifier on intercepted methods and fields on class files prior to Java 5.

15. April 2018: version 1.8.5

  • Release with equals and hashCode methods being generated based on the fixes in the previous version.

15. April 2018: version 1.8.4

  • Only open ASM if this is specified via the boolean property net.bytebuddy.experimental.
  • Fix resolution of invoking methods of Object on interfaces to not specialize on the interface type. The latter is also failing verification on Android.
  • Several performance improvements.
  • Do no longer use unsafe injection as a default class loading strategy.

31. March 2018: version 1.8.3

  • Allow Java 11 classes by opening ASM.
  • Remove Lombok and add methods using Byte Buddy plugin.

31. March 2018: version 1.8.2

  • Reduce log output for Gradle and Maven plugin.
  • Fix class check in EqualsMethod.

28. March 2018: version 1.8.1

  • Add implementations for HashCodeMethod, EqualsMethod and ToStringMethod including build tool plugins.
  • Refactor handling of stack map frame translation within Advice to allow for handling of methods with inconsistent stack map frames if the method arguments are copied.
  • Make argument copying the default choice if exit advice is enabled.
  • Fix a bug in parameter annotation computation within Advice.
  • Update to ASM 6.1.1.

13. March 2018: version 1.8.0

  • Refactored Advice argument handling to be controlled by a dedicated structure.
  • Added basic logic for argument copying in Advice.
  • Fix performance degradation for cached fields.
  • Add support for Java 10 and preliminary support for Java 11.

2. March 2018: version 1.7.11

  • Fix Maven and Gradle plugins to resolve correct class file version.
  • Add method to ClassReloadingStrategy to allow specification of explicit redefinition strategy. Change default redefinition strategy.
  • Improve stack map frame validation in Advice.
  • Fix type resolution for virtual calls in MemberSubstitution.

2. February 2018: version 1.7.10

  • Fixes self-attachment on Java 9+ on Windows.
  • Check for non-accessibility on MethodCall.
  • Change static proxy fields to be volatile.
  • Do not copy security-related meta-data on jar file copying.
  • Guard resolution of annotations for methods with synthetic parameters.
  • Forbid skipping code in constructors for Advice.
  • Added constructor strategy for defining a default constructor that invokes a non-default constructor.
  • Improve performance of accessor methods and cache fields by reducing use of String::format.

6. November 2017: version 1.7.9

  • Fixes RAW_TYPES mode for loaded types where properties were resolved incorrectly.
  • Adds support for Java 10 version number.

24. October 2017: version 1.7.8

  • Added property net.bytebuddy.raw to allow for suppress generic type navigation.

22. October 2017: version 1.7.7

  • Make self-attachment more robust on Windows.
  • Add M2E instructions for Maven plugin.
  • Improve hash function for members and avoid collision field names.
  • Convenience for custom target binders.

8. October 2017: version 1.7.6

  • Update ASM to version 6 final.
  • Accept null in custom bound Advice.
  • Fix fail fast in build plugins.
  • Permit repeated exception in method signature.

30. August 2017: version 1.7.5

  • Prevents premature termination of reattempting retransformation.

30. August 2017: version 1.7.4

  • Add convenience methods for defining bean properties.
  • Minor fixes to support Java 9 and allow building on JDK9.

11. August 2017: version 1.7.3

  • Allow configuring TypePool to use within Advice.

05. August 2017: version 1.7.2

  • Fixes possibility to customize binding in MethodDelegation.
  • Update to ASM 6 beta to support Java 9 fully.

15. June 2017: version 1.7.1

  • Added DiscoveryStrategy for redefinition to determine types to be redefined.
  • Changed Maven plugin to only warn of missing output directory which might be missing.
  • Added global circularity lock.
  • Removed sporadic use of Java util logging API.

14. May 2017: version 1.7.0

  • Define names for automatic modules in Java 9.
  • Introduce property net.bytebuddy.nexus.disabled to allow disabling Nexus mechanism.
  • Do not use context ProtectionDomain when using Nexus class.
  • Normalize Advice class custom bindings via opening internally used OffsetMapping API. Remove CustomValue binding which is less powerful.
  • Do not group transient with volatile modifier.
  • Introduce MemberRemoval component for removing fields and/or methods.
  • Introduce first version for MemberSubstituion class for replacing field/method access.

26. April 2017: version 1.6.14

  • Extended AgentBuilder listener API.
  • Added trivial RawMatcher.
  • Check modules for modifiability.
  • Adapt new Java 9 namespaces for modules.
  • Start external process for self-attachment if self-attachment is not allowed.

17. April 2017: version 1.6.13

  • Explicit consistency check for stack map frame information in Advice.
  • Extended InstallationListener API.
  • Fixed stack size information on variable storage.

18. March 2017: version 1.6.12

  • Add InstallationListener in favor of InstallationStrategy and allow resubmission strategy to hook into it in order to cancel submitted jobs.

12. March 2017: version 1.6.11

  • Fix modifier adjustment for visibility bridges (did not work last time)
  • Added class injector for Java 9 handle class definition.

1. March 2017: version 1.6.10

  • Allow installation of ClassFileTransformer in byte array class loader.
  • Adjust visibility for bridge methods.

20. February 2017: version 1.6.9

  • Properly add visibility bridges for default methods.
  • Added matcher for unresolvable types.
  • Improved ByteBuddyAgent API.
  • Fixed Gradle and Maven plugin path resolution.

12. February 2017: version 1.6.8

  • Avoid logging on empty resubmission.
  • Retain actual modifiers on frozen instrumented type.

26. January 2017: version 1.6.7

  • Refactored Resubmitter to a DSL-step within the redefinition configuration.
  • Added additional element matchers.

24. January 2017: version 1.6.6

  • Fixed computation of modifiers for rebased method in native state.

20. January 2017: version 1.6.5

  • Improved lazy resolution of super types in matchers.
  • Added frozen instrumented type and factory for such types when no class file format changes are desired.
  • Improved lazy resolution for generic type signatures.

19. January 2017: version 1.6.4

  • Refactored super type visitors to always be lazy until generic properties are required to be resolved.
  • Apply proper raw type resolution. Made default method graph compiler reify generic types to compute correct bridges.

13. January 2017: version 1.6.3

  • Improved Resubmitter configuration.
  • Added AgentBuilder.Transformation.ForAdvice to allow for simple creation of Advice classes from Java agents.

11. January 2017: version 1.6.2

  • Removed obsolete toString representations.
  • Start using Lombok for equals/hashCode unless explicit.
  • Add security manager check to Byte Buddy agent.
  • Added asynchronous super type loading strategies.
  • Added resubmitter.
  • Added class injection strategy for Android.
  • Fixed type initializer instrumentation for redefinitions.
  • Added loaded property for listener on agent builder.

5. January 2017: version 1.6.1

  • Added check to @Pipe for method invokability.
  • Added unsafe ClassInjector and class loading strategy.
  • Improved reflection-based class injector on Java 9.
  • Removed unnecessary class file location using modules on Java 9.
  • Improved fail-safety for type variable resolution to allow processing incorrectly declared type variables.

2. January 2017: version 1.6.0

  • Added InjectingClassLoader with class loading strategy that allows for reflection-free loading.
  • Added proper class loader locking to injection strategy.
  • Fixed method lookup to not use declared accessors unless necessary to avoid security manager check.
  • Added @SuperMethod and @DefaultMethod annotations for MethodDelegation.
  • Refactored AsmVisitorWrapper to accept a list of fields and methods that are intercepted. This allows to use the wrapper also for methods that are overridden.
  • Added a MethodGraph.Compiler.ForDeclaredMethods to avoid processing full type hierarchy if only type enhancement should be done without declaring new methods on a type. This should be used in combination with Advice instead of MethodGraph.Empty as those methods are supplied to the ASM visitor wrappers.
  • Refactored MethodDelegation to precompile records for all candidates to avoid duplicate annotation processing.

29. December 2016: version 1.5.13

  • Updates to ASM 5.2
  • Updates Android DX-maker.
  • Adds API to MultipleParentClassLoader to use other loader than bootstrap loader as a parent which is not always legal, e.g. on Android.
  • Make ClassInjector use official class loading lock if one is available.
  • Make ClassInjector use getDefinedPackage instead of getPackage if available.
  • Declare UNIX socket library as provided in Byte Buddy agent to only add the dependency on demand.

27. December 2016: version 1.5.12

  • Refactored rebasing of type initializers. Do no longer rebase into static method to pass validation for final static field assignment on Java 9.
  • Added fallback to sun.misc.Unsafe for class definition if reflective access to the protected ClassLoader methods is not available which are required for the injection strategy.
  • Added super-type-loading DescriptorStrategy for agent builder.
  • Added assignment checks for MethodCall for invocation target.

20. December 2016: version 1.5.11

  • Resolved compound components to linearize nested collections for vastly improved performance with large structures.
  • Added TypeCache.
  • Added fallback to assign null to SuperCall and DefaultCall if assignment is impossible.
  • Deprecated Forwarding in favor of MethodCall.
  • Fixed matcher for interfaces in type builder DSL.
  • Fixed resolution of field type in MethodCall.

16. December 2016: version 1.5.10

  • Added possibility for readding types after a failed retransformation batch.
  • Added partitioning batch allocator.

13. December 2016: version 1.5.9

  • Allow specifying TargetType in Advice.FieldValue.
  • Allow array value explosion in MethodCall.
  • Extended FieldAccessor to allow reading FieldDescriptions directly.
  • Fixed class name resolution in Maven and Gradle plugins.

5. December 2016: version 1.5.8

  • Added implementation for attachment on Linux and HotSpot using a non-JDK VM.
  • Fixed argument resolution for ByteBuddyAgent.
  • Fixed field resolution for MethodCall to allow custom definition of fields.
  • Fixed visibility checks.
  • Do not override default method for proxies for Pipe.

25. November 2016: version 1.5.7

  • Fixed type discovery for custom advice annotation bindings.

18. November 2016: version 1.5.6

  • Added possibility to configure suppression handler in Advice classes.

17. November 2016: version 1.5.5

  • Refactored Advice to use stack manipulations and Assigner.
  • Refactored Advice to use Return instead of BoxedReturn and added AllArguments instead of BoxedArguments in conjunction with allowing to use dynamic typing for assignments via the annotation.
  • Added fixed value instrumentation for method parameters.
  • Added weak class loader referencing for Nexus and allow registration of a ReferenceQueue.

11. November 2016: version 1.5.4

  • Extended MethodCall API.
  • Added additional element matchers.
  • Extended AsmVisitorWrapper API.

3. November 2016: version 1.5.3

  • Refactored Advice to allow usage as a wrapper for an Implementation. This allows chaining of such advices.
  • Allow to dynamically locate a FieldDescription or ParameterDescription from a custom Advice annotation which binds the field or parameter value.
  • Added invokeSelf option to MethodCall instrumentation.

31. October 2016: version 1.5.2

  • Refactored FieldAccessor to allow more flexible creation of getters and setters of particular parameters.
  • Create string-based hashes for random fields that depend on a value's hash value.

27. October 2016: version 1.5.1

  • Fixed stack size computation when using @Advice.Origin.

25. October 2016: version 1.5.0

  • Refactor Instrumentations to only delegate to fields instead of requiring their definition. The defineField API should be generally preferred for defining fields as it is much richer and therefore easier to extend.
  • Made type annotation reader more robust towards older versions of Java 8.
  • Refactored lazy type resolution for generic types to no longer eagerly load generic types when navigating through a type hierarchy.
  • Unified several implementation APIs and added better abstractions.
  • Fixed some missing bits of validation of implementations.
  • Do not replicate incompatible bridge methods.

17. October 2016: version 1.4.33

  • Use IMITATE_SUPER_CLASS_OPENING as a default constructor strategy.
  • Extract method visibility during method graph compilation.
  • Apply a type variable's erasure if a type variable is out of scope instead of throwing an exception. This can happen when subclassing an inner type outside of its outer type or when a compiler such as scalac adds inconsistent generic type information.
  • Optimize the application of the ignore matcher within an agent builder to only be applied once.

11. October 2016: version 1.4.32

  • Added ConstructorStrategy for inheriting constructors but make them public.
  • Do not instrument anonymously loaded types during redefinition unless the lambda strategy is enabled.

6. October 2016: version 1.4.31

  • Reuse CircularityLock on all AgentBuilders by default to avoid that Byte Buddy agents introduce circularities to different agents.
  • Also allow using Advice as Implementation.
  • Added FixedValue.self() and added FieldPersistence for describing volatile fields.

4. October 2016: version 1.4.30

  • Also acquire circularity lock during class file retransformation.
  • Added slicing BatchAllocator.

3. October 2016: version 1.4.29

  • Explicitly check for recursive transformation of types used during a transformation causing a ClassCircularityError from an AgentBuilder by adding thread-local locking.

30. September 2016: version 1.4.28

  • Additional refactoring of the AgentBuilder to fix a regression of 1.4.27.
  • Unified the error listener and the regular listener that were added in the previous version.

29. September 2016: version 1.4.27

  • Refactored AgentBuilder retransformation mechanism to allow for custom recovery and batch strategies.
  • Fixed Gradle plugin build which did not contain files.
  • Supply no argument to agent attachment by default instead of empty string argument.

Note: Currently, it seems like the new retransformation mechanism introduces a racing condition in class loading resulting in some classes not being instrumented

21. September 2016: version 1.4.26

  • Refactored skipOn property of Advice component.
  • Allow reading a Method/Constructor property from Advice.
  • Fixed bug that duplicated added parameter annotations on a DynamicType builder.

20. September 2016: version 1.4.25

  • Added overloaded versions for byte-buddy-agent to allow agent attachment with explicit argument.
  • Made Advice more flexible to allow skipping of instrumented method for complex advice method return types.

15. September 2016: version 1.4.24

  • Make AgentBuilder produce ResettableClassFileTransformers which can undo their transformation.

14. September 2016: version 1.4.23

  • Made TypeDescription.ForLoadedType serializable for better alignment with reflection API.
  • Adapted changes in Instrumentation API for Java 9.
  • Refactored AnnotationValue to apply Java 9 specific string rendering on Java 9 VMs.
  • Adapted new toString representation of parameterized types on Java 9 VMs.

02. September 2016: version 1.4.22

  • Added Byte Buddy plugin for Gradle.
  • Improved Byte Buddy plugin for Maven.

28. August 2016: version 1.4.21

  • Fixed modifier resolution for anonymous classes to preserve a shadowed final modifier.
  • Added Byte Buddy plugin for Maven.

21. August 2016: version 1.4.20

  • Fixed stack size adjustment for accessing double-sized primitive access array elements.
  • Fixed Advice adjustment of local variable index for debugging information (improves Java agent compatibility).
  • Renamed TypeLocator to PoolStrategy to avoid confusion with the names.
  • Removed DescriptionStrategys that rely on fallback-description as those do not properly fallback for meta data.
  • Added FallbackStrategy as a replacement which allows to reattempt a transformation without using loaded type information.

14. August 2016: version 1.4.19

  • Added @StubValue and @Unused annotations to Advice component.
  • Added possibility to retain line number information for entryAdvice
  • Removed class loader dependency when querying loaded annotation values.
  • Made annotation values more type-safe.

9. August 2016: version 1.4.18

  • Added automatic support for Java 9 class file location for boot modules.
  • Improved FieldProxy.Binder to allow for a single accessor interface.
  • Fixed counting problem in Advice component.

1. August 2016: version 1.4.17

  • Fixed annotation resolution for Java 9 to exclude the jdk.internal namespace by default.
  • Do not copy annotations for default constructor strategies but allow configuring annotation strategy.
  • Added file-system class file locators for modules in Java 9.
  • Added convenience methods to default location strategies.
  • Exclude sun.reflect namespace by default from AgentBuilder to avoid error messages.
  • Fixed resolution of type variables for transformed methods and fields.
  • Fixed stack-aware method visitor when encountering exchanging duplication instructions.

28. July 2016: version 1.4.16

  • Added POOL_LAST_DEFERRED and POOL_LAST_FALLBACK description strategy.
  • Fixed resolution of bridge methods for diamond inheritance.
  • Refactored modifier API to only expose named modifier checks for an element that apply to it.
  • Fixed resolution for type variables for transformed methods.

25. July 2016: version 1.4.15

  • Fixed frame generation for void methods without regular return in Advice.
  • Fixed TypeValidation for Java 8 interfaces not allowing private methods.
  • Simplified and documented AccessController usage.

21. July 2016: version 1.4.14

  • Fixed bug with handling of legacy byte code instructions in Advice component.
  • Cleaned up and refactored usage of AccessController. Added privileged handling to AgentBuilder.
  • Added proper buffering to non-buffered interaction with file streams.
  • Make ByteBuddy creation more robust by adding a default fallback for unknown VMs.
  • Improved support for Java 9.

19. July 2016: version 1.4.13

  • Lazily compute Implementation.Target and Implementation.Context in case of a type inlining to provide correct feature set. Added validation if this constraint is broken.
  • Make TypePool using an eager TypeDescription more robust towards errors.

15. July 2016: version 1.4.12

  • Monitor advice code for inconsistent stack heights at return statements to clean the stack during instrumentation to not trigger verifier errors if such atypical but legal code is encountered.
  • Do not generate handlers for return values if an instrumented method or an advice method only throws exceptions but never returns regularly.

15. July 2016: version 1.4.11

  • Added tracer for the state of the operand stack for the Advice component to clear the stack upon a return. Without this, if code would return without leaving the stack empty, a verifier error would be thrown. This typically is only a problem when processing code that was produced by other code generation libraries.

15. July 2016: version 1.4.10

  • Fixed resolution of modifiers and local type properties from a default type pool.
  • Improved key for caching TypeLocator to share a key for the system and bootstrap class loader.

11. July 2016: version 1.4.9

  • Added additional implementations of a DescriptionStrategy for POOL_LAST and POOL_FIRST resolution.

6. July 2016: version 1.4.8

  • Allow to skip execution of instrumented method from Advice via entry advice indicated by return value.
  • Added API to transform predefined type variables on a dynamic type.
  • Refactored Transformer API to be shared for methods, fields and type variables.
  • Allow to spread Advice methods over multiple classes.
  • Added convenience methods to AsmVisitorWrappers for declared fields and methods.
  • Performance improvements in Advice class for byte code parsing.

6. July 2016: version 1.4.7

  • Added default TypePool that allows for lazy resolution of referenced types. This can both be a performance improvement and allows working with optional types as long as they are not directly required within a transformation. This type pool is now used by default.
  • Make interfaces public by default when creating them via ByteBuddy::makeInterface.
  • Added TypeResolutionStrategy to allow for active resolution via the Nexus also from outside the AgentBuilder.
  • Make best effort from a ClassLoadingStrategy to not resolve types during loading.
  • Added convenience method for loading a dynamic type with an implicit ClassLoadingStrategy.

30. June 2016: version 1.4.6

  • Added a ClassFileLocator for a class loader that only references it weakly.
  • Allow to supply TypePool and ClassFileLocator separately within an AgentBuilder.
  • Made MethodPool sensitive to bridge methods which should only be added to classes of a version older than Java 4.
  • Fixed creation of Java 9 aware ClassFileTransformer to only apply on Java 9 VMs.
  • Added matcher for the type of a class loader.
  • Fixed name resolution of anonymously-loaded types.

24. June 2016: version 1.4.5

  • Added InstallationStrategy to AgentBuilder that allows customization of error handling.
  • Added chunked redefinition and retransformation strategies.

23. June 2016: version 1.4.4

  • Added net.bytebuddy qualifier when logging.
  • Added net.bytebuddy.dump system property for specifying a location for writing all created class files.

17. June 2016: version 1.4.3

  • Fixed bug in MultipleParentClassLoader where class loaders were no longer filtered properly.
  • Added support for major.minor version 53 (Java 9).
  • Made DescriptionStrategy customizable.

16. June 2016: version 1.4.2

  • Changed storage order of return values in Advice methods to avoid polluting the local variable array when dealing with nested exception handlers.
  • Added caching ElementMatcher as a wrapping matcher.
  • Exclude Byte Buddy types by default from an AgentBuilder.
  • Added DescriptionStrategy that allows not using reflection in case that a class references non-available classes.

7. June 2016: version 1.4.1

  • Fixed validation by MethodCall instrumentation for number of arguments provided to a method.
  • Added further support for module system.
  • Allow automatic adding of read-edges to specified classes/modules when instrumenting module classes.
  • Implicitly skip methods without byte code from advice component.

2. June 2016: version 1.4.0

  • Added initial support for Jigsaw modules.
  • Adjusted agent builder API to expose modules of instrumented classes.
  • Added additional matchers.
  • Simplified BinaryLocator and changed its name to TypeLocator.

30. May 2016: version 1.3.20

  • Fixed MultipleParentClassLoader to support usage as being a parent itself.
  • Fixed default ignore matcher for AgentBuilder to ignore synthetic types.

29. April 2016: version 1.3.19

  • Added convenience method to MethodCall to add all arguments of the instrumented method.
  • Added optional attribute to Advice.This.

25. April 2016: version 1.3.18

  • The Owner type of a parameterized type created by a TypePool is no longer parameterized for a static inner type.
  • The receiver type of a executingTransformer is no longer considered parameterized for a static inner type.

23. April 2016: version 1.3.17

  • Removed overvalidation of default values for non-static fields.

21. April 2016: version 1.3.16

  • Better support for Java 1 to Java 4 by automatically resolving type references from a type pool to forName lookups.
  • Better support for dealing with package-private types by doing the same for invisible types.
  • Simplified MethodHandle and MethodType handling as JavaInstance.

19. April 2016: version 1.3.15

  • Extended the AgentBuilder to allow for transformations that apply fall-through semantics, i.e. work as a decorator.
  • Added map-based BinaryLocator.

19. April 2016: version 1.3.14

  • Only add frames in Advice components if class file version is above 1.5.
  • Allow to specify exception type for exit advice to be named. This implies a default change where exit advice is no longer invoked by default when an exception is thrown from the instrumented method.
  • Added possibility to assign a value to a @BoxedReturn value to change the returned value.

16. April 2016: version 1.3.13

  • Extended the Advice component storing serializable values that cannot be represented in the constant pool as encodings in the constant pool.
  • Added support for non-inlined Advice method.
  • Mask modifiers of ASM to not longer leak internal flags beyond the second byte.
  • Added support for suppressing an exception of the instrumented method from within exit advice.

13. April 2016: version 1.3.12

  • Fixed error during computation of frames for the Advice computation.
  • Avoid reusing labels during the computations of exception tables of the Advice component.

12. April 2016: version 1.3.11

  • Byte Buddy Advice now appends handlers to an existing exception handler instead of prepending them. Before, existing exception handlers were shadowed when applying suppression or exit advice on an exception.
  • Added additional annotations for Advice such as @Advice.BoxedReturn and @Advice.BoxedArguments for more generic advice. Added possibility to write to fields from advice.
  • Added mechanism for adding custom annotations to Advice that map compile-time constants.
  • Implemented a canonical binder for adding custom compile-time constants to a MethodDelegation mapping.

8. April 2016: version 1.3.10

  • Fixed another bug during frame translation of the Advice component when suppression were not catched for an exit advice.
  • Improved unit tests to automatically build Byte Buddy with Java 7 and Java 8 byte code targets in integration.

7. April 2016: version 1.3.9

  • Optimized method size for Advice when exception is not catched.
  • Improved convenience method disableClassFormatChanges for AgentBuilder.

6. April 2016: version 1.3.8

  • Fixed frame computation for the Advice.
  • Optimized frame computation to emit frames of the minimal, possible size when using Advice.
  • Only add exit Advice once to reduce amount of added bytes to avoid size explosion when a method supplied several exits.
  • Optimized Advice injection to only add advice infrastructure if entry/exit advice is supplied.
  • Optimized exception handling infrastructure for exit Advice to only be applied when exceptions are catched.
  • Added mapping for the IINC instruction which was missing from before.
  • Added possibility to propagate AMS reader and writer flags for AsmVisitorWrapper.
  • Made Advice method parser respect ASM reader flags for expanding frames.

3. April 2016: version 1.3.7

  • Fixed bug when returning from an Advice exit method without return value and accessing @Advice.Thrown.
  • Added additional annotations for advice @Advice.Ignored and @Advice.Origin.
  • Implemented frame translator for Advice method to reuse existing frame information instead of recomputing it.

1. April 2016: version 1.3.6

  • Implemented universal FieldLocator.
  • Extended AgentBuilder API to allow for more flexible matching and ignoring types.

18. Match 2016: version 1.3.5

  • Added Advice.FieldValue annotation for reading fields from advice.

13. March 2016: version 1.3.4

  • Added support for new Java 9 version scheme.

10. March 2016: version 1.3.3

  • Added hierarchical notation to default TypePool.

10. March 2016: version 1.3.2

  • Added possibility to suppress Throwable from advice methods when using the Advice instrumentation.

9. March 2016: version 1.3.1

  • Added possibility to use contravariant parameters within the Advice adapter for ASM.

8. March 2016: version 1.3.0

  • Added Advice adapter for ASM.
  • Fixed AsmVisitorWrapper registration to be stacked instead of replacing a previous value.
  • Added validation for setting field default values what can only be done for static fields. Clarified javadoc.
  • Fixed attach functionality to work properly on IBM's J9.

22. February 2016: version 1.2.3

  • Fixed return type resolution for overloaded bridge method.

16. February 2016: version 1.2.2

  • Fixed redefinition strategy for AgentBuilder where transformations were applied twice.
  • Added ClassLoader as a third argument for the AgentBuilder.Transformer.

6. February 2016: version 1.2.1

  • Added validation for receiver types.
  • Set receiver types to be implicit when extracting constructors of a super type.

5. February 2016: version 1.2.0

  • Added support for receiver type retention during type redefinition and rebasement.
  • Added support for receiver type definitions.

5. February 2016: version 1.1.1

  • Fixed interface assertion of the custom binder types to accept default methods.
  • Improved documentation.

26. January 2016: version 1.1.0

  • Refactored AgentBuilder API to be more streamlined with the general API and improved documentation.
  • Added possibility to instrument classes that implement lambda expressions.
  • Added possibility to explicitly ignore types from an AgentBuilder. By default, synthetic types are ignored.
  • Proper treatment of deprecation which is now written into the class file as part of the resolved modifier and filtered on reading.
  • Added support for Java 9 APIs for process id retrieval.

21. January 2016: version 1.0.3

  • Added support for Java 9 owner type annotations.
  • Fixed bug in type builder validation that prohibited annotations on owner types for non-generic types.
  • Added additional element matchers for matching an index parameter type.

20. January 2016: version 1.0.2

  • Fixed resolution of type paths for inner classes.
  • Added preliminary support for receiver types.
  • Fixed resolution of type variables from a static context.

18. January 2016: version 1.0.1

  • Refactored type variable bindings for generic super types: Always retain variables that are defined by methods.
  • Retain type annotations that are defined on a TargetType.

15. January 2016: version 1.0.0

  • Added support for type annotations.
  • Refactored public API to support type annotations and parameter meta information.
  • Several renamings in preparation of the 1.0.0 release.
  • Refactored type representation to represent raw types as TypeDescriptions. This allows for resolution of variables on these types as erasures rather than their unresolved form. Refactored naming of generic types to the common naming scheme with nested classes.
  • Replaced generalized token representation to define tokens, type tokens and signature tokens.
  • General API improvements and minor bug fixes.

4. January 2016: version 0.7.8

  • Implemented all type lists of class file-rooted files to fallback to type erasures in case that the length of generic types and raw types does not match. This makes Byte Buddy more robust when dealing with illegally defined class files.
  • Fixed rule on a default method's invokeability.
  • Extended MethodCall implementation to include shortcuts for executing Runnable and Callable instances.
  • Added failSafe matcher that returns false for types that throw exceptions during navigation.

14. December 2015: version 0.7.7

  • Fixed type resolution for anonymously loaded classes by the ClassReloadingStrategy.
  • Added additional InitiailizationStrategys for self-injection where the new default strategy loads types that are independent of the instrumented type before completing the instrumentation. This way, the resolution does not fail for types that are accessed via reflection before initializing the types if a executingTransformer is rebased.

11. December 2015: version 0.7.6

  • Fixed resolution of @Origin for constructors and added possibility to use the Executable type.
  • Fixed name resolution of types loaded by anonymous class loading.
  • Allowed alternative lookup for redefinitions to support types loaded by anonymous class loading.

7. December 2015: version 0.7.5

  • Fixed generic type resolution optimization for proxies for @Super.

2. December 2015: version 0.7.4

  • Added TypePool that returns precomputed TypeDescriptions for given types.
  • Fixed agent and nexus attachment and the corresponding value access.

30. November 2015: version 0.7.3

  • Added visibility substitution for @Super when the instrumented type is instrumented to see changed state on a redefinition.
  • Added patch for modifier information of inner classes on a redefinition.
  • Added fallback for Nexus injection to attempt lookup of already loaded class if resource cannot be located.

26. November 2015: version 0.7.2

  • Added TypePool that falls back to class loading if a class cannot be located.
  • Added binary locator for agent builder that uses the above class pool and only parses the class file of the instrumented type.
  • Added methods for reading inner classes of a TypeDescription.
  • Fixed random naming based on random numbers to avoid signed numbers.
  • Moved Nexus and Installer types to a package-level to avoid illegal outer and inner class references which could be resolved eagerly.
  • Added validation for illegal constant pool entries.
  • Added a Premature initialization strategy for optimistically loading auxiliary types.
  • Added a ClassVisitorWrapper for translating Java class files prior to Java 5 to use explicit class loading rather than class pool constants.

16. November 2015: version 0.7.1

  • Fixed injection order for types to avoid premature loading by dependent auxiliary types.
  • Added additional ClassFileLocators and refactored class file lookup to always use these locators.

11. November 2015: version 0.7

  • Refactored injection strategy to always inject and load the instrumented type first to avoid premature loading by reference from auxiliary types.
  • Refactored AgentBuilder.Default to delay auxiliary type injection until load time to avoid premature loading by reference from auxiliary types.
  • Added API to add additional code to type initializers while building a type.
  • Refactored agent Nexus to allow for multiple registrations of self initializers if multiple agents are registered via Byte Buddy.
  • Fixed resolution of interface methods that were represented in the type hierarchy multiple times.
  • Implemented custom ASM class writer to allow for frame computation via Byte Buddy's type pool when this is required by a user.
  • Fallback to no allowing for instrumenting type initializers for rebased or redefined interfaces before Java 8.

28. October 2015: version 0.7 (release candidate 6)

  • Refactored AgentBuilder.Default to delegate exceptions during redefinitions to listener instead of throwing them.
  • Fixed bug where instrumented type would count to auxiliary types and trigger injection strategy.
  • Fixed bug where interface types would resolve to a non-generic type signature.
  • Added strategy to use redefinition or retransformation of the Instrumentation API when building agents.
  • Added lazy facade to be used by agent builder to improve performance for name-based matchers.

15. October 2015: version 0.7 (release candidate 5)

  • Fixed parser to suppress exceptions from generic signatures which are not supposed to be included in the class file if no array type is generic.
  • Fixed class validator which did not allow <clinit> blocks in interface types.
  • Added restriction to retransformation to not attempt a retransformation at all if no class should be retransformed.
  • Added a factory for creating an Implementation.Context that is configurable. This way, it is possible to avoid a rebase of a type initializer which is not always possible.
  • Added a possibility to specify for an AgentBuilder how it should redefine or rebase a class that is intercepted.

13. October 2015: version 0.7 (release candidate 4)

  • Fixed naming strategy for fields that cache values which chose duplicate names.
  • Fixed resolution of raw types within the type hierarchy which were represented as non-generic TypeDescription instances where type variables of members were not resolved.
  • Added possibility to specify hints for ClassReader and ClassWriter instances.
  • Fixed resolution for modifiers of members that are defined by Byte Buddy. Previously, Byte Buddy would sometimes attempt to define private synthetic methods on generated interfaces.
  • Fixed assignability resolution for arrays.
  • Fixed class file parser which would not recognize outer classes for version 1.3 byte code.

6. October 2015: version 0.7 (release candidate 3)

  • Read Nexus instances of the Byte Buddy agents from the enclosing class loader rather than from the system class loader. This allows for their usage from OSGi environments and for user with other custom class loaders.
  • Changed modifiers for accessor methods and rebased methods to be public when rebasing or accessing methods of a Java 8 interface. For interfaces, all modifiers must be public, even for such synthetic members.
  • Support absolute path names for accessing class file resources of the ByteArrayClassLoader.
  • Added random suffix to the names of rebased methods to avoid naming conflicts.

16. September 2015: version 0.7 (release candidate 2)

  • Refactored runtime attachment of Java agents to support Java 9 and additional legacy VM (version 8-).
  • Refactored MethodGraph to only represent virtual methods.
  • Changed notion of visibility to not longer consider the declaring type as part of the visibility.
  • Increased flexibility of defining proxy types for @Super and @Default annotations.
  • Added directional AmbigouityResolver.
  • Fixed detection of methods that can be rebased to not include methods that did not previously exist.

11. August 2015: version 0.7 (release candidate 1)

  • Added support for generic types.
  • Replaced MethodLookupEngine with MethodGraph.Compiler to provide a richer data structure.
  • Added support for bridge methods (type and visibility bridges).
  • Refactored the predefined ElementMatchers to allow for matching generic types.
  • Replaced the ModifierResolver with a more general MethodTransformer.

11. August 2015: version 0.6.15

  • Added support for discovery and handling of Java 9 VMs.
  • Fixed class loading for Android 5 (Lollipop) API.

20. July 2015: version 0.6.14

  • Fixed resolution of ignored methods. Previously, additional ignored methods were not appended but added as an additional criteria for ignoring a method.

17. July 2015: version 0.6.13

  • Fixed resolution of field accessors to not attempt reading of non-static fields from static methods.
  • Fixed renaming strategy for type redefinitions to work around a constraint of ASM where stack map frames required to be expanded even though this was not strictly necessary.

10. July 2015: version 0.6.12

  • Added API for altering a method's modifiers when intercepting it.
  • Added API for allowing to filter default values when writing annotations.

22. June 2015: version 0.6.11

  • Added additional ClassFileLocators for locating jar files in folders and jar files.
  • Added explicit check for invalid access of instance fields from static methods in field accessing interceptors.
  • Added the @StubValue and @FieldValue annotations.

18. June 2015: version 0.6.10 (and 0.6.9)

  • Corrected the resolution of a type's visibility to another type to determine if a method can be legally overridden.
  • Previous version 0.6.9 contained another bug when attempting to fix this problem.

Corrected incorrect deployment of version 0.6.7 which does not use a dependency reduced POM for the byte-buddy module.

1. June 2015: version 0.6.8 (and 0.6.7)

  • Upgraded ASM dependency to 5.0.4.
  • Fixed OSGi headers in all relevant artifacts.

Warning: The byte-buddy artifact of version 0.6.7 is accidentally deployed with a defect POM file which does not exclude the shaded resources.

28. May 2015: version 0.6.6

  • Fixed error in resolution of the TargetType pseudo-variable when used as component type of an array.

7. May 2015: version 0.6.5

  • Extended public API with convenience methods.

6. May 2015: version 0.6.4

  • Extended public API to accept more general argument types when appropriate.
  • Extended @Origin annotation to allow for accepting modifiers.

29. April 2015: version 0.6.3

  • Made the TypeDescription.ForLoadedType class loader agnostic. Before, a class that was loaded by multiple class loaders would have been considered inequal what is not true for the byte code level.

23. April 2015: version 0.6.2

  • Added additional class validation such that it becomes impossible to define members on classes that do not fit the class's structure, i.e. default methods on Java interfaces in version seven.
  • Added default Assigner singleton.

21. April 2015: version 0.6.1

  • Added AnnotationDescription.Builder to allow easy definition of annotation values without loading any values.
  • Added possibility to define enumerations at runtime.
  • Added possibility to dynamically read enumerations for the MethodCall and InvokeDynamic implementations.
  • Further API clean-up.

15. April 2015: version 0.6

  • Renamed the Instrumentation interface to Implementation to avoid naming conflicts with Java types.
  • Renamed the Field annotation to FieldProxy to avoid naming conflicts with Java types.
  • Refactored package structure to make the implementation more readable.
  • Added possibility to define annotation default values.
  • Avoid creation of an auxiliary placeholder type for method rebasements if it is not required.
  • Avoid rebasing of methods if they are not instrumented.
  • Reimplemented TypeWriter, MethodRegistry and other supporting infrastructure to make the code simpler.
  • Refactored testing that is related to the previous infrastructure.

21. March 2015: version 0.5.6

  • Added possibility to write parameter meta information to created classes if it is fully available for a method.

20. March 2015: version 0.5.5

  • Retrofitted method parameters to be represented by ParameterDescriptions and added possibility to extract names and modifiers for these parameters, either by using the Java 8 API (if available) or by reading this information from the underlying class file.
  • Fixed a NullPointerException being thrown due to accidental return of a null value from a method.

15. March 2015: version 0.5.4

  • Fixed missing retention of method annotations of instrumented types.
  • Allowed dynamic lookup of methods for the MethodCall instrumentation.

24. February 2015: version 0.5.3

  • Changed the SuperMethodCall instrumentation to fall back to a default method call if required. A different behavior was found to surprise users and would introduce subtle bugs in user code as the super method instrumentation would always work with subclassing due to Java super method call semantics.
  • Added a MethodCall instrumentation that allows hard-coding a method call.
  • Added an InvokeDynamic instrumentation that allows runtime dispatching by bootstrap methods.
  • Fixed the default TypePool to retain generic signatures in order to avoid that agents delete such signatures.
  • Fixed a bug in all of the the default ConstructorStrategy that effectively prevented intercepting of constructors.

18. January 2015: version 0.5.2

  • Fixed a bug where interface generation would result in a NullPointerException.
  • Added additional ElementMatchers that allow to identify class loaders.

5. December 2014: version 0.5.1

Added the andThen method to the SuperMethodCall instrumentation in order to allow for a more convenient executingTransformer interception where a hard-coded super method call is required by the Java verifier.

3. December 2014: version 0.5

  • Added the DeclaringTypeResolver as a component in the default chain which selects the most specific method out of two. This is mainly meant to avoid the accidental matching of the methods that are declared by the Object type.
  • Added TypeInitializers in order to allow Instrumentations to define type initializer blocks.
  • Replaced the MethodMatcher API with the ElementMatcher API which allows for a more sophisticated matching DSL.
  • Added a ClassLoadingStrategy for Android in its own module.
  • Introduced an AgentBuilder API and implementation.

26. November 2014: version 0.4.1

  • Refactored the implementation of the VoidAwareAssigner which would otherwise cause unexpected behavior in its default state.
  • Added a missing boxing instruction to the InvocationHandlerAdapter.

18. November 2014: version 0.4

  • Extended Instrumentation.Context to support field accessors.
  • Added the TypePool abstraction and added a default implementation.
  • Refactored annotations to have an intermediate form as AnnotationDescription which does not need to represent loaded values.
  • Refactored several built-in Instrumentation, among others, all implementations now support TypeDescription in addition to loaded Class as their arguments
  • Added several annotations that apply to the MethodDelegation.

19. September 2014: version 0.3.1

  • Added support for optionally specifying a ProtectionDomain for the built-in ClassLoadingStrategy implementations.
  • Fixed a bug in the resolution of resources of the ByteArrayClassLoader and its child-first implementation.

15. September 2014: version 0.3

  • Added basic support for Java 7 types MethodHandle and MethodType which are available from Java 7 for injection.
  • Added support for type redefinition and type rebasing.
  • Added support for accessing a JVM's HotSwap features and a Java agent.
  • Added latent a child-first ClassLoadingStrategy and manifest versions of the WRAPPER and CHILD_FIRST default class loading strategies.

20. June 2014: version 0.2.1

  • Added proper support for defining class initializers. Added support for field caching from method instrumentations, mainly for allowing the reuse of Method instances for the @Origin annotation and the InvocationHandlerAdapter.

16. June 2014: version 0.2

  • Changed the semantics of the @SuperCall to be only bindable, if a super method can be invoked. Before, an exception was thrown if only a non-existent or abstract super method was found.
  • Added features for the interaction with Java 8 default methods. Refactored method lookup to extract invokable default methods.
  • Refactored the invocation of super methods to be created by an Instrumentation.Target. For a future release, this hopefully allows for class redefinitions using today's API for creating subclasses.
  • Upgraded to ASM 5.0.3.

02. May 2014: version 0.1

  • First general release.