Replace Nullable with CheckForNull

etc/checkstyle-configuration.xml

@@ -139,7 +139,7 @@
     <module name="IllegalCatch"/>
     <module name="IllegalImport">
       <property name="illegalPkgs" value="net.jcip.annotations, javax.annotation"/>
-      <property name="illegalClasses" value="edu.umd.cs.findbugs.annotations.CheckForNull"/>
+      <property name="illegalClasses" value="edu.umd.cs.findbugs.annotations.Nullable"/>
       <property name="severity" value="error"/>
     </module>
   </module>

pom.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 
   <modelVersion>4.0.0</modelVersion>
   <groupId>edu.hm.hafner</groupId>
@@ -91,7 +92,7 @@
     <pitest-junit5-plugin.version>0.12</pitest-junit5-plugin.version>
     <maven-error-prone-plugin.version>2.8.6</maven-error-prone-plugin.version>
     <error-prone.version>2.4.0</error-prone.version>
-    <nullaway.version>0.7.5</nullaway.version>
+    <nullaway.version>0.8.0</nullaway.version>
     <maven-depgraph-plugin.version>3.3.0</maven-depgraph-plugin.version>
     <versions-maven-plugin.version>2.7</versions-maven-plugin.version>
     <revapi-maven-plugin.version>0.12.1</revapi-maven-plugin.version>
@@ -105,6 +106,16 @@
 
   </properties>
 
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>com.uber.nullaway</groupId>
+        <artifactId>nullaway</artifactId>
+        <version>${nullaway.version}</version>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+
   <dependencies>
     <dependency>
       <groupId>com.github.spotbugs</groupId>
@@ -258,7 +269,7 @@
             <arg>-Xep:MethodCanBeStatic:OFF</arg>
             <arg>-Xep:WildcardImport:OFF</arg>
             <arg>-Xep:ThrowsUncheckedException:OFF</arg>
-            <arg>-Xep:NullableDereference:OFF</arg> <!-- Exception -->
+            <arg>-Xep:NullableDereference:OFF</arg>
           </compilerArgs>
           <compilerId>javac-with-errorprone</compilerId>
           <forceJavacCompilerUse>true</forceJavacCompilerUse>
@@ -461,6 +472,18 @@
             <revapi.semver.ignore>
               <enabled>true</enabled>
             </revapi.semver.ignore>
+            <revapi.ignore >
+              <item>
+                <code>java.annotation.removed</code>
+                <annotation>@edu.umd.cs.findbugs.annotations.Nullable</annotation>
+                <justification>Annotation should be save to change.</justification>
+              </item>
+              <item>
+                <code>java.annotation.added</code>
+                <annotation>@edu.umd.cs.findbugs.annotations.CheckForNull</annotation>
+                <justification>Annotation should be save to change.</justification>
+              </item>
+            </revapi.ignore>
           </analysisConfiguration>
         </configuration>
         <executions>

src/main/java/edu/hm/hafner/util/Ensure.java

@@ -8,8 +8,8 @@
 
 import com.google.errorprone.annotations.FormatMethod;
 
+import edu.umd.cs.findbugs.annotations.CheckForNull;
 import edu.umd.cs.findbugs.annotations.CheckReturnValue;
-import edu.umd.cs.findbugs.annotations.Nullable;
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 
 /**
@@ -59,8 +59,8 @@ public static BooleanCondition that(final boolean value) {
      * @return an object condition
      */
     @CheckReturnValue
-    public static ObjectCondition that(@Nullable final Object value,
-            @Nullable final Object... additionalValues) {
+    public static ObjectCondition that(@CheckForNull final Object value,
+            @CheckForNull final Object... additionalValues) {
         return new ObjectCondition(value, additionalValues);
     }
 
@@ -73,7 +73,7 @@ public static ObjectCondition that(@Nullable final Object value,
      * @return an iterable condition
      */
     @CheckReturnValue
-    public static IterableCondition that(@Nullable final Iterable<?> value) {
+    public static IterableCondition that(@CheckForNull final Iterable<?> value) {
         return new IterableCondition(value);
     }
 
@@ -86,7 +86,7 @@ public static IterableCondition that(@Nullable final Iterable<?> value) {
      * @return a collection condition
      */
     @CheckReturnValue
-    public static CollectionCondition that(@Nullable final Collection<?> value) {
+    public static CollectionCondition that(@CheckForNull final Collection<?> value) {
         return new CollectionCondition(value);
     }
 
@@ -100,7 +100,7 @@ public static CollectionCondition that(@Nullable final Collection<?> value) {
      */
     @SuppressWarnings("PMD.UseVarargs")
     @CheckReturnValue
-    public static ArrayCondition that(@Nullable final Object[] value) {
+    public static ArrayCondition that(@CheckForNull final Object[] value) {
         return new ArrayCondition(value);
     }
 
@@ -113,7 +113,7 @@ public static ArrayCondition that(@Nullable final Object[] value) {
      * @return a string condition
      */
     @CheckReturnValue
-    public static StringCondition that(@Nullable final String value) {
+    public static StringCondition that(@CheckForNull final String value) {
         return new StringCondition(value);
     }
 
@@ -126,7 +126,7 @@ public static StringCondition that(@Nullable final String value) {
      * @return an exception condition
      */
     @CheckReturnValue
-    public static ExceptionCondition that(@Nullable final Throwable value) {
+    public static ExceptionCondition that(@CheckForNull final Throwable value) {
         return new ExceptionCondition(value);
     }
 
@@ -194,7 +194,7 @@ private Ensure() {
      * Assertions for iterables.
      */
     public static class IterableCondition extends ObjectCondition {
-        @Nullable
+        @CheckForNull
         private final Iterable<?> value;
 
         /**
@@ -203,7 +203,7 @@ public static class IterableCondition extends ObjectCondition {
          * @param value
          *         value of the condition
          */
-        public IterableCondition(@Nullable final Iterable<?> value) {
+        public IterableCondition(@CheckForNull final Iterable<?> value) {
             super(value);
 
             this.value = value;
@@ -255,7 +255,7 @@ public void isNotEmpty(final String explanation, final Object... args) {
      * Assertions for iterables.
      */
     public static class CollectionCondition extends IterableCondition {
-        @Nullable
+        @CheckForNull
         private final Collection<?> value;
 
         /**
@@ -265,7 +265,7 @@ public static class CollectionCondition extends IterableCondition {
          *         value of the condition
          */
         @SuppressWarnings("AssignmentToCollectionOrArrayFieldFromParameter")
-        public CollectionCondition(@Nullable final Collection<?> value) {
+        public CollectionCondition(@CheckForNull final Collection<?> value) {
             super(value);
 
             this.value = value;
@@ -350,7 +350,7 @@ public void doesNotContain(final Object element, final String explanation, final
      * Assertions for arrays.
      */
     public static class ArrayCondition extends ObjectCondition {
-        @Nullable
+        @CheckForNull
         private final Object[] values;
 
         /**
@@ -361,7 +361,7 @@ public static class ArrayCondition extends ObjectCondition {
          */
         @SuppressWarnings({"AssignmentToCollectionOrArrayFieldFromParameter", "PMD.ArrayIsStoredDirectly", "PMD.UseVarargs"})
         @SuppressFBWarnings("EI2")
-        public ArrayCondition(@Nullable final Object[] values) {
+        public ArrayCondition(@CheckForNull final Object[] values) {
             super(values);
 
             this.values = values;
@@ -413,7 +413,7 @@ public void isNotEmpty(final String explanation, final Object... args) {
      * Assertions for strings.
      */
     public static class StringCondition extends ObjectCondition {
-        @Nullable
+        @CheckForNull
         private final String value;
 
         /**
@@ -422,7 +422,7 @@ public static class StringCondition extends ObjectCondition {
          * @param value
          *         value of the condition
          */
-        public StringCondition(@Nullable final String value) {
+        public StringCondition(@CheckForNull final String value) {
             super(value);
 
             this.value = value;
@@ -509,9 +509,9 @@ private boolean isBlank() {
      * Assertions for objects.
      */
     public static class ObjectCondition {
-        @Nullable
+        @CheckForNull
         private final Object value;
-        @Nullable
+        @CheckForNull
         private final Object[] additionalValues;
 
         /**
@@ -520,7 +520,7 @@ public static class ObjectCondition {
          * @param value
          *         value of the condition
          */
-        public ObjectCondition(@Nullable final Object value) {
+        public ObjectCondition(@CheckForNull final Object value) {
             this(value, new Object[0]);
         }
 
@@ -534,7 +534,7 @@ public ObjectCondition(@Nullable final Object value) {
          */
         @SuppressFBWarnings("EI2")
         @SuppressWarnings({"AssignmentToCollectionOrArrayFieldFromParameter", "PMD.ArrayIsStoredDirectly"})
-        public ObjectCondition(@Nullable final Object value, @Nullable final Object... additionalValues) {
+        public ObjectCondition(@CheckForNull final Object value, @CheckForNull final Object... additionalValues) {
             this.value = value;
             this.additionalValues = additionalValues;
         }
@@ -740,7 +740,7 @@ public void isTrue() {
      * Assertions for exceptions.
      */
     public static class ExceptionCondition {
-        @Nullable
+        @CheckForNull
         private final Throwable value;
 
         /**
@@ -749,7 +749,7 @@ public static class ExceptionCondition {
          * @param value
          *         value of the condition
          */
-        public ExceptionCondition(@Nullable final Throwable value) {
+        public ExceptionCondition(@CheckForNull final Throwable value) {
             this.value = value;
         }
 

src/main/java/edu/hm/hafner/util/PathUtil.java

@@ -10,7 +10,7 @@
 import org.apache.commons.io.FilenameUtils;
 import org.apache.commons.lang3.StringUtils;
 
-import edu.umd.cs.findbugs.annotations.Nullable;
+import edu.umd.cs.findbugs.annotations.CheckForNull;
 
 /**
  * Utilities for {@link Path} instances.
@@ -228,7 +228,7 @@ public String getRelativePath(final String relative) {
      *
      * @return the absolute path
      */
-    public String createAbsolutePath(final @Nullable String directory, final String fileName) {
+    public String createAbsolutePath(final @CheckForNull String directory, final String fileName) {
         if (isAbsolute(fileName) || StringUtils.isBlank(directory)) {
             return makeUnixPath(fileName);
         }

src/main/java/edu/hm/hafner/util/StringContainsUtils.java

@@ -2,7 +2,7 @@
 
 import org.apache.commons.lang3.StringUtils;
 
-import edu.umd.cs.findbugs.annotations.Nullable;
+import edu.umd.cs.findbugs.annotations.CheckForNull;
 
 /**
  * A simple helper class in the style of {@link StringUtils} that provides methods to check if strings contain
@@ -38,8 +38,8 @@ public final class StringContainsUtils {
      *
      * @return {@code true} if any of the search CharSequences are found, {@code false} otherwise
      */
-    public static boolean containsAnyIgnoreCase(@Nullable final CharSequence input,
-            @Nullable final String... searchTexts) {
+    public static boolean containsAnyIgnoreCase(@CheckForNull final CharSequence input,
+            @CheckForNull final String... searchTexts) {
         if (StringUtils.isEmpty(input)) {
             return false;
         }

src/main/java/edu/hm/hafner/util/TreeString.java

@@ -5,7 +5,7 @@
 
 import org.apache.commons.lang3.StringUtils;
 
-import edu.umd.cs.findbugs.annotations.Nullable;
+import edu.umd.cs.findbugs.annotations.CheckForNull;
 
 /**
  * {@link TreeString} is an alternative string representation that saves the memory when you have a large number of
@@ -19,7 +19,7 @@ public final class TreeString implements Serializable {
     private static final long serialVersionUID = 3621959682117480904L;
 
     /** Parent node that represents the prefix. */
-    @Nullable
+    @CheckForNull
     private TreeString parent;
 
     /** {@link #parent} + {@code label} is the string value of this node. */
@@ -41,7 +41,7 @@ public final class TreeString implements Serializable {
      *         the suffix
      */
     @SuppressWarnings("NullAway")
-    TreeString(@Nullable final TreeString parent, final String label) {
+    TreeString(@CheckForNull final TreeString parent, final String label) {
         Ensure.that(parent == null || !label.isEmpty())
                 .isTrue("if there's a parent '%s', label '%s' can't be empty", parent, label);
 
@@ -77,7 +77,7 @@ TreeString split(final String prefix) {
     }
 
     @VisibleForTesting
-    @Nullable
+    @CheckForNull
     TreeString getParent() {
         return parent;
     }

src/test/java/edu/hm/hafner/util/ArchitectureRules.java

@@ -50,7 +50,7 @@ public final class ArchitectureRules {
     /** Prevents that classes use visible but forbidden API. */
     public static final ArchRule NO_FORBIDDEN_ANNOTATION_USED =
             noClasses().should().dependOnClassesThat(
-                    have(type(edu.umd.cs.findbugs.annotations.CheckForNull.class)));
+                    have(type(edu.umd.cs.findbugs.annotations.Nullable.class)));
 
     /** Prevents that classes use visible but forbidden API. */
     public static final ArchRule NO_FORBIDDEN_CLASSES_CALLED