Lombok: Lombok can't invoke compiler if isFork=true in Gradle 4.6.

[soberich]

There is a issue similar to many other through the history of Lombok it seems.

compiler #tools

Now, after changing Gradle version to 4.6 if with JDK 1.8_162
if I put isFork = true in javaCompile

        withType<JavaCompile> {
            options.apply {
                // compiler deamon JVM options
                isFork = true
            }
        }

I got

warning: Can't initialize javac processor due to (most li
kely) a class loader problem: java.lang.NoClassDefFoundError: com/sun/tools/javac/processing/JavacProcessingEnvironment

        at lombok.javac.apt.LombokProcessor.init(LombokProcessor.java:85)
        at lombok.core.AnnotationProcessor$JavacDescriptor.want(AnnotationProcessor.java:87)
        at lombok.core.AnnotationProcessor.init(AnnotationProcessor.java:140)
        at lombok.launch.AnnotationProcessorHider$AnnotationProcessor.init(AnnotationProcessor.java:69)
        at com.sun.tools.javac.processing.JavacProcessingEnvironment$ProcessorState.<init>(JavacProcessingEnvironment.java:500)
        at com.sun.tools.javac.processing.JavacProcessingEnvironment$DiscoveredProcessors$ProcessorStateIterator.next(JavacProcessingEnvironment.java:597)
        at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:690)
        at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91)
        at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1035)
        at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1176)
        at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)
        at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:856)
        at com.sun.tools.javac.main.Main.compile(Main.java:523)
        at com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:129)
        at com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:138)
        at org.gradle.api.internal.tasks.compile.IncrementalAnnotationProcessingCompileTask.call(IncrementalAnnotationProcessingCompileTask.java:73)
        at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:50)
        at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:37)
        at org.gradle.api.internal.tasks.compile.daemon.AbstractDaemonCompiler$CompilerRunnable.run(AbstractDaemonCompiler.java:87)
        at org.gradle.workers.internal.DefaultWorkerServer.execute(DefaultWorkerServer.java:36)
        at org.gradle.workers.internal.WorkerDaemonServer.execute(WorkerDaemonServer.java:46)
        at org.gradle.workers.internal.WorkerDaemonServer.execute(WorkerDaemonServer.java:30)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.gradle.process.internal.worker.request.WorkerAction.run(WorkerAction.java:100)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
        at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
        at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:146)
        at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:128)
        at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:404)
        at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
        at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
        at java.lang.Thread.run(Thread.java:748)
  Caused by: java.lang.ClassNotFoundException: com.sun.tools.javac.processing.JavacProcessingEnvironment
        at java.lang.ClassLoader.findClass(ClassLoader.java:530)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at lombok.launch.ShadowClassLoader.loadClass(ShadowClassLoader.java:422)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 42 more

With Gradle 4.5.1. it is working fine
or if I simply comment out isFork = true

So, what are the options to fix this??

[victorwss]

I think that a MVCE here would be helpful.

[timtelcik]

This issue also occurs in Gradle 4.7

https://github.com/rzwitserloot/lombok/issues/1671

[victorwss]

You need to use Java9+ to compile lombok!

[soberich]

@victorwss this was not about compiling Lombok,
about using it in project. I understand that to BUILD Lombok locally u need to use 9th,
but it was not about Building. Issue present.

[timtelcik]

Hello @victorwss,

I suspect I have observed the same issue using Gradle 4.6/4.7 + Lombok 1.16.6/.16.20.

More details in related Lombok issue 1671 at

Java 8 compiler cannot compile Lombok annotations when used with Gradle 4.6 or Gradle 4.7 and java compiler fork option is true

https://github.com/rzwitserloot/lombok/issues/1671

I can prepare a test case if that will assist with the investigation.

Regards,

Tim

[oehme]

FYI this was fixed in Gradle 4.10. If there are any other such issues, please let me know, so I can improve our smoke test.