Lombok: [BUG] Lombok disables itself when building with JDK 14

[friendlyanon]

Describe the bug
Building with JDK 14 shows the following error:

warning: You aren't using a compiler supported by lombok, so lombok will not work and has been disabled.
  Your processor is: org.gradle.api.internal.tasks.compile.processing.IncrementalProcessingEnvironment
  Lombok supports: OpenJDK javac, ECJ

To Reproduce

1. Use AdoptOpenJDK 14
2. Generate a brand new project with Spring Initializr that uses Lombok
3. gradlew bootRun

Expected behavior
Build without errors.

Version info (please complete the following information):

• Lombok latest
• javac 14.0.1

Additional context
I have attached a demo project that reproduces the error in JDK 14 but not in JDK 11.
demo.zip

[Rawi01]

I can not reproduce the issue. I also tried different java versions, including the latest AdoptOpenJDK version and verified that lombok works by adding some annotations. Can you provide some more details for example a full log of the build or an docker image that can be used to reproduce it?

Disclaimer: I'm not a project owner.

[mschaaf]

@Rawi01 have you tried the attached demo project in the demo.zip file? I can reproduce it with this project.

[Rawi01]

@mschaaf Yes, I tried the demo project and also create a new project using Spring Initializr. I tried AdoptOpenJDK 14.0.1+7 and AdoptOpenJDK 14.0.2+12.

[mschaaf]

My steps to reproduce:

1. unpack the demo.zip to a folder called demo
2. change into that folder
3. install sdk install java 14.0.1.j9-adpt
4. use sdk use java 14.0.1.j9-adpt
5. call ./gradlew clean
6. call ./gradlew bootRun

Or with openjdk

1. unpack the demo.zip to a folder called demo
2. change into that folder
3. install sdk install java 14.0.2-open
4. use sdk use java 14.0.2-open
5. call ./gradlew clean
6. call ./gradlew bootRun

• sdk referes to sdkman.io

[Rawi01]

I tried to run this in a new ubuntu docker container but it requires two changes:

• 14.0.1.j9-adpt is no longer available, I had to use 14.0.2.j9-adpt
• I had to add chmod +x gradlew to run it

After that both JDKs work without any problems.

[FrogDevelopper]

I have exactly the same issue when using

• java version _14.0.2.j9-adpt_ (installed via sdkman too)
• gradle version _6.5.1_
• gradle plugin io.freefair.lombok version _5.1.0_

building by IntelliJ or command line lead to the same error message:

> Task :compileJava FAILED
warning: You aren't using a compiler supported by lombok, so lombok will not work and has been disabled.
Your processor is: org.gradle.api.internal.tasks.compile.processing.IncrementalProcessingEnvironment
Lombok supports: OpenJDK javac, ECJ

But I don't have any issue when using hotspot variant 14.0.2.j9-hs

[Rawi01]

I finally managed to reproduce this one in a docker container. On my normal machine the build crashes which is a OpenJ9 related bug and fixed in the latest edge version. Adding the edge version fixed both builds. Can you confirm that this solves the problem?

[friendlyanon]

I can confirm that the edge version builds on AdoptOpenJDK 14.0.2 with the attached project.

[doublefx]

Note that it happens to me with AdoptOpenJDK 11.0.8

I'm using IntellIJ 2020.3 EAP

java: You aren't using a compiler supported by lombok, so lombok will not work and has been disabled.
Your processor is: com.sun.proxy.$Proxy27
Lombok supports: OpenJDK javac, ECJ

And also with Maven 3.6.3, same JDK

[Vyacheslav-Lapin]

Same problem

[mplushnikov]

@doublefx IntelliJ issue is handled by #2592

[mschaaf]

Is it possible to close this as with the latest AdoptOpenJDK and version Lombok v1.18.16 this is fixed for me?

[rzwitserloot]

Thanks to @Rawi01 for doing a lot of the work on this one. The error has multiple causes; As per @mplushnikov 's suggestion, let's discuss the one caused by the Processor type being com.sun.proxy.$Proxy27 in issue #2592, and leave this one for the gradlew issue. We've fixed that in .16, and from what I read here, that fix is working. Let me know if 1.18.16 and/or edge causes this issue __and__ org.gradle.api.internal.tasks.compile.processing.IncrementalProcessingEnvironment is reported as the processor, so that I can re-open.