| Annotation processing type element look-up problem with Java 9 or later [message #1835434] |
Thu, 03 December 2020 05:30  |
Eclipse User |
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Hello,
I have an annotation processor that uses the javax.lang.model classes to do its thing. This works perfectly up to Java 8, but when I try to run my build with Java 9 or later I get AbortCompilation exceptions when I call javax.lang.model.util.Elements.getTypeElement. (See the full call stack below [1]).
Debugging a bit into the JDT, it looks like the element look-up code behaves quite differently in module-based JDK versions (v9 or greater), which makes sense. I think modules is somehow the key to my problem, but I'm a little bit lost about what I need to do to my code to get this to work.
One interesting observation is that my build works fine under Maven using either JDK 1.8 or JDK 9+. This seems to be a problem specific to the JDT annotation processor.
I tried declaring a module-info.java file containing an empty "open module" declaration. This seems to get me a little bit further but it breaks a bunch of other things. Specifically, it seems that doing this brings me into the world of modules where I now need to explicitly declare my module requirements for it to work. This is a lot of overhead and isn't something I want to impose on consumers of my library. I would like to find a solution that "just works" without requiring changes across the various code bases using my utility.
Is there any guidance for getting annotation processors to work with Java 9+ ? Any ideas you might have would be appreciated as I'm a little bit stuck at the moment.
Thanks in advance!
Scott
[1] Full call stack from error:
java.lang.Exception: org.eclipse.jdt.internal.compiler.problem.AbortCompilation:
at org.eclipse.jdt.internal.compiler.apt.dispatch.RoundDispatcher.handleProcessor(RoundDispatcher.java:172)
at org.eclipse.jdt.internal.compiler.apt.dispatch.RoundDispatcher.round(RoundDispatcher.java:124)
at org.eclipse.jdt.internal.compiler.apt.dispatch.BaseAnnotationProcessorManager.processAnnotations(BaseAnnotationProcessorManager.java:171)
at org.eclipse.jdt.internal.apt.pluggable.core.dispatch.IdeAnnotationProcessorManager.processAnnotations(IdeAnnotationProcessorManager.java:138)
at org.eclipse.jdt.internal.compiler.Compiler.processAnnotationsInternal(Compiler.java:958)
at org.eclipse.jdt.internal.compiler.Compiler.processAnnotations(Compiler.java:932)
at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:450)
at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:426)
at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:386)
at org.eclipse.jdt.internal.core.builder.BatchImageBuilder.compile(BatchImageBuilder.java:214)
at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:318)
at org.eclipse.jdt.internal.core.builder.BatchImageBuilder.build(BatchImageBuilder.java:79)
at org.eclipse.jdt.internal.core.builder.JavaBuilder.buildAll(JavaBuilder.java:278)
at org.eclipse.jdt.internal.core.builder.JavaBuilder.build(JavaBuilder.java:187)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:832)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:220)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:263)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:316)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:319)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:371)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:392)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:154)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:244)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)
Caused by: org.eclipse.jdt.internal.compiler.problem.AbortCompilation:
at org.eclipse.jdt.internal.core.builder.NameEnvironment.findClass(NameEnvironment.java:476)
at org.eclipse.jdt.internal.core.builder.NameEnvironment.findType(NameEnvironment.java:546)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.lambda$0(LookupEnvironment.java:237)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForTypeFromModules(LookupEnvironment.java:372)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType(LookupEnvironment.java:236)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.getType(LookupEnvironment.java:1703)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.getType(LookupEnvironment.java:1672)
at org.eclipse.jdt.internal.compiler.apt.model.ElementsImpl9.getTypeElement(ElementsImpl9.java:81)
at org.eclipse.jdt.internal.compiler.apt.model.ElementsImpl9.getTypeElement(ElementsImpl9.java:53)
at com.scott.toolkit.common.lang.model.element.SkeletonGenerator.findClass(SkeletonGenerator.java:134)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
at com.scott.toolkit.common.lang.model.element.SkeletonGenerator.loadClass(SkeletonGenerator.java:107)
at com.scott.toolkit.common.bean.codegen.source.BaseValueClassGenerator.generateFiles(BaseValueClassGenerator.java:141)
at com.scott.toolkit.common.bean.codegen.source.BaseValueClassGenerator.generateFiles(BaseValueClassGenerator.java:38)
at com.scott.toolkit.common.annotation.processing.SkeletonBasedGenerator$2.eval(SkeletonBasedGenerator.java:68)
at com.scott.toolkit.common.annotation.processing.SkeletonBasedGenerator$2.eval(SkeletonBasedGenerator.java:65)
at com.scott.toolkit.common.util.Iterables$11$1.eval(Iterables.java:778)
at com.scott.toolkit.common.util.Iterables$11$1.eval(Iterables.java:774)
at com.scott.toolkit.common.util.Iterators$FlatMapIterator.internalNext(Iterators.java:1551)
at com.scott.toolkit.common.util.Iterators$IteratorWithLookahead.nextElement(Iterators.java:1238)
at com.scott.toolkit.common.util.Iterators$IteratorWithLookahead.hasNext(Iterators.java:1202)
at com.scott.toolkit.common.annotation.processing.GeneratorBase.process(GeneratorBase.java:130)
at org.eclipse.jdt.internal.compiler.apt.dispatch.RoundDispatcher.handleProcessor(RoundDispatcher.java:142)
... 25 more
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