NPE in SupportSwaggerProcessor when sources do not include a package statement

[apupier]

Bug description

• Use Camel Jbang to create a Camel Quarkus project: jbang '-Dcamel.jbang.version=4.7.0' camel@apache/camel export --runtime=quarkus --gav=com.acme:myproject:1.0-SNAPSHOT
• Use Camel JBang to create a Camel route: jbang '-Dcamel.jbang.version=4.7.0' camel@apache/camel init 'src/main/resources/camel/demo.camel.yaml'
• Start it with mvn compile quarkus:dev '-Pcamel.debug'
  there is this exception:

2024-09-04 13:44:06,601 ERROR [io.qua.dep.dev.IsolatedDevModeMain] (main) Failed to start quarkus: java.lang.RuntimeException: io.quarkus.builder.BuildException: Build failure: Build failed due to errors
        [error]: Build step org.apache.camel.quarkus.support.swagger.deployment.SupportSwaggerProcessor#reflectiveClasses threw an exception: java.lang.NullPointerException: Cannot invoke "String.startsWith(String)" because the return value of "org.jboss.jandex.DotName.packagePrefix()" is null
        at org.apache.camel.quarkus.support.swagger.deployment.SupportSwaggerProcessor.lambda$reflectiveClasses$0(SupportSwaggerProcessor.java:32)
        at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:178)
        at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1708)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
        at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
        at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
        at org.apache.camel.quarkus.support.swagger.deployment.SupportSwaggerProcessor.reflectiveClasses(SupportSwaggerProcessor.java:35)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        at java.base/java.lang.reflect.Method.invoke(Method.java:580)
        at io.quarkus.deployment.ExtensionLoader$3.execute(ExtensionLoader.java:849)
        at io.quarkus.builder.BuildContext.run(BuildContext.java:256)
        at org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18)
        at org.jboss.threads.EnhancedQueueExecutor$Task.doRunWith(EnhancedQueueExecutor.java:2516)
        at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2495)
        at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1521)
        at java.base/java.lang.Thread.run(Thread.java:1583)
        at org.jboss.threads.JBossThread.run(JBossThread.java:483)

        at io.quarkus.runner.bootstrap.AugmentActionImpl.runAugment(AugmentActionImpl.java:331)
        at io.quarkus.runner.bootstrap.AugmentActionImpl.createInitialRuntimeApplication(AugmentActionImpl.java:252)
        at io.quarkus.runner.bootstrap.AugmentActionImpl.createInitialRuntimeApplication(AugmentActionImpl.java:58)
        at io.quarkus.deployment.dev.IsolatedDevModeMain.firstStart(IsolatedDevModeMain.java:113)
        at io.quarkus.deployment.dev.IsolatedDevModeMain.accept(IsolatedDevModeMain.java:435)
        at io.quarkus.deployment.dev.IsolatedDevModeMain.accept(IsolatedDevModeMain.java:56)
        at io.quarkus.bootstrap.app.CuratedApplication.runInCl(CuratedApplication.java:138)
        at io.quarkus.bootstrap.app.CuratedApplication.runInAugmentClassLoader(CuratedApplication.java:93)
        at io.quarkus.deployment.dev.DevModeMain.start(DevModeMain.java:131)
        at io.quarkus.deployment.dev.DevModeMain.main(DevModeMain.java:62)
Caused by: io.quarkus.builder.BuildException: Build failure: Build failed due to errors
        [error]: Build step org.apache.camel.quarkus.support.swagger.deployment.SupportSwaggerProcessor#reflectiveClasses threw an exception: java.lang.NullPointerException: Cannot invoke "String.startsWith(String)" because the return value of "org.jboss.jandex.DotName.packagePrefix()" is null
        at org.apache.camel.quarkus.support.swagger.deployment.SupportSwaggerProcessor.lambda$reflectiveClasses$0(SupportSwaggerProcessor.java:32)
        at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:178)
        at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1708)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
        at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
        at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
        at org.apache.camel.quarkus.support.swagger.deployment.SupportSwaggerProcessor.reflectiveClasses(SupportSwaggerProcessor.java:35)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        at java.base/java.lang.reflect.Method.invoke(Method.java:580)
        at io.quarkus.deployment.ExtensionLoader$3.execute(ExtensionLoader.java:849)
        at io.quarkus.builder.BuildContext.run(BuildContext.java:256)
        at org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18)
        at org.jboss.threads.EnhancedQueueExecutor$Task.doRunWith(EnhancedQueueExecutor.java:2516)
        at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2495)
        at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1521)
        at java.base/java.lang.Thread.run(Thread.java:1583)
        at org.jboss.threads.JBossThread.run(JBossThread.java:483)

        at io.quarkus.builder.Execution.run(Execution.java:123)
        at io.quarkus.builder.BuildExecutionBuilder.execute(BuildExecutionBuilder.java:79)
        at io.quarkus.deployment.QuarkusAugmentor.run(QuarkusAugmentor.java:160)
        at io.quarkus.runner.bootstrap.AugmentActionImpl.runAugment(AugmentActionImpl.java:327)
        ... 9 more
Caused by: java.lang.NullPointerException: Cannot invoke "String.startsWith(String)" because the return value of "org.jboss.jandex.DotName.packagePrefix()" is null
        at org.apache.camel.quarkus.support.swagger.deployment.SupportSwaggerProcessor.lambda$reflectiveClasses$0(SupportSwaggerProcessor.java:32)
        at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:178)
        at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1708)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
        at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
        at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
        at org.apache.camel.quarkus.support.swagger.deployment.SupportSwaggerProcessor.reflectiveClasses(SupportSwaggerProcessor.java:35)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        at java.base/java.lang.reflect.Method.invoke(Method.java:580)
        at io.quarkus.deployment.ExtensionLoader$3.execute(ExtensionLoader.java:849)
        at io.quarkus.builder.BuildContext.run(BuildContext.java:256)
        at org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18)
        at org.jboss.threads.EnhancedQueueExecutor$Task.doRunWith(EnhancedQueueExecutor.java:2516)
        at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2495)
        at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1521)
        at java.base/java.lang.Thread.run(Thread.java:1583)
        at org.jboss.threads.JBossThread.run(JBossThread.java:483)

[apupier]

workaround: add the package to the created Java file

It would be nice to have a better error message

[apupier]

Note that if moved to the root, so no tusing package, there is the same error. Even if not recommended by Java practice, this is a valid configuration