mapstruct/mapstruct-spring-extensions

Error when compiling with Eclipse

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#57 opened on Oct 1, 2022

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Description

    With following environment  `compiler: Eclipse JDT (IDE) 1.4.200.v20220802-0458, environment: Java 17.0.4.1 (Eclipse Adoptium)`, adapter class will NOT be generating method for all of the converters, but it only generate the class.

[Error - 4:53:17 AM] Sep 30, 2022, 4:53:17 AM Exception thrown by Java annotation processor org.mapstruct.extensions.spring.converter.ConverterMapperProcessor@67b39ba
java.lang.ClassCastException: class org.eclipse.jdt.internal.compiler.apt.model.AnnotationValueImpl cannot be cast to class javax.lang.model.element.AnnotationMirror (org.eclipse.jdt.internal.compiler.apt.model.AnnotationValueImpl is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @6f270916; javax.lang.model.element.AnnotationMirror is in module java.compiler of loader 'platform')
java.lang.Exception: java.lang.ClassCastException: class org.eclipse.jdt.internal.compiler.apt.model.AnnotationValueImpl cannot be cast to class javax.lang.model.element.AnnotationMirror (org.eclipse.jdt.internal.compiler.apt.model.AnnotationValueImpl is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @6f270916; javax.lang.model.element.AnnotationMirror is in module java.compiler of loader 'platform')
	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:172)
	at org.eclipse.jdt.internal.apt.pluggable.core.dispatch.IdeAnnotationProcessorManager.processAnnotations(IdeAnnotationProcessorManager.java:138)
	at org.eclipse.jdt.internal.compiler.Compiler.processAnnotations(Compiler.java:953)
	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:379)
	at org.eclipse.jdt.internal.core.builder.BatchImageBuilder.compile(BatchImageBuilder.java:214)
	at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:311)
	at org.eclipse.jdt.internal.core.builder.BatchImageBuilder.build(BatchImageBuilder.java:79)
	at org.eclipse.jdt.internal.core.builder.JavaBuilder.buildAll(JavaBuilder.java:273)
	at org.eclipse.jdt.internal.core.builder.JavaBuilder.build(JavaBuilder.java:188)
	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:1024)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:254)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:311)
	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:400)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:403)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:514)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:462)
	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:544)
	at org.eclipse.core.internal.resources.Workspace.buildInternal(Workspace.java:524)
	at org.eclipse.core.internal.resources.Workspace.build(Workspace.java:420)
	at org.eclipse.jdt.ls.core.internal.handlers.BuildWorkspaceHandler.buildProjects(BuildWorkspaceHandler.java:112)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$28(JDTLanguageServer.java:885)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$55(JDTLanguageServer.java:1070)
	at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$Completion.exec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool.scan(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)
Caused by: java.lang.ClassCastException: class org.eclipse.jdt.internal.compiler.apt.model.AnnotationValueImpl cannot be cast to class javax.lang.model.element.AnnotationMirror (org.eclipse.jdt.internal.compiler.apt.model.AnnotationValueImpl is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @6f270916; javax.lang.model.element.AnnotationMirror is in module java.compiler of loader 'platform')
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
	at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown Source)
	at java.base/java.util.stream.AbstractPipeline.copyInto(Unknown Source)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source)
	at java.base/java.util.stream.AbstractPipeline.evaluate(Unknown Source)
	at java.base/java.util.stream.ReferencePipeline.collect(Unknown Source)
	at org.mapstruct.extensions.spring.converter.ConverterMapperProcessor.toSourceTargetTypeNamePairs(ConverterMapperProcessor.java:104)
	at java.base/java.util.Optional.map(Unknown Source)
	at org.mapstruct.extensions.spring.converter.ConverterMapperProcessor.getExternalConversionMappings(ConverterMapperProcessor.java:95)
	at org.mapstruct.extensions.spring.converter.ConverterMapperProcessor.buildDescriptor(ConverterMapperProcessor.java:77)
	at org.mapstruct.extensions.spring.converter.ConverterMapperProcessor.process(ConverterMapperProcessor.java:63)
	at org.eclipse.jdt.internal.compiler.apt.dispatch.RoundDispatcher.handleProcessor(RoundDispatcher.java:142)
	... 34 more

Originally posted by @myatmin in https://github.com/mapstruct/mapstruct-spring-extensions/issues/53#issuecomment-1263110178

Contributor guide

Research direction
Investigate the ClassCastException in ConverterMapperProcessor.toSourceTargetTypeNamePairs when processing annotations in Eclipse JDT. The error occurs when casting an AnnotationValueImpl to AnnotationMirror. Determine the correct way to retrieve annotation mirrors from annotation values in the Eclipse compiler and update the code accordingly.
Tech stack
java
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaEclipseAnnotation Processing
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20