Unable to load class 'com.palantir.javapoet.AnnotationSpec'.

[kevinm416]

What happened?

I switched from square.javapoet 1.13.0 to palantir.javapoet 0.5.0 according to the migration instructions.

dependencies {
  compileOnly 'com.squareup:javapoet:1.13.0'
  compileOnly group: 'com.google.auto.service', name: 'auto-service', version: '1.1.1'
  annotationProcessor group: 'com.google.auto.service', name: 'auto-service', version: '1.1.1'
}

Became:

dependencies {
  compileOnly 'com.palantir.javapoet:javapoet:0.5.0'
  compileOnly group: 'com.google.auto.service', name: 'auto-service', version: '1.1.1'
  annotationProcessor group: 'com.google.auto.service', name: 'auto-service', version: '1.1.1'
}

After fixing the fields -> getters as mentioned in the migration instructions, I tried to build the project with Palantir's version of the library, and I got the error:

Unable to load class 'com.palantir.javapoet.AnnotationSpec'.
This is an unexpected error. Please file a bug containing the idea.log file.

This is the contents of idea.log:

2024-10-16 21:44:35,694 [906222664]   INFO - #o.j.p.g.GradleManager - Instructing gradle to use java from /Users/kevin/Library/Java/JavaVirtualMachines/corretto-21.0.1/Contents/Home
2024-10-16 21:44:35,695 [906222665]   INFO - #o.j.p.g.GradleManager - Instructing gradle to use java from /Users/kevin/Library/Java/JavaVirtualMachines/corretto-21.0.1/Contents/Home
2024-10-16 21:44:35,699 [906222669]   INFO - #o.j.p.g.s.e.GradleExecutionHelper - Passing command-line to Gradle Tooling API: [projects] :buildSrc:classes :buildSrc:testClasses --init-script /private/var/folders/7j/8y7kchxj02b2xs5qfdqsk8t00000gn/T/ijMapper1.gradle --init-script /private/var/folders/7j/8y7kchxj02b2xs5qfdqsk8t00000gn/T/ijresolvers1.gradle -Didea.active=true -Didea.version=2024.2.2 -Didea.vendor.name=JetBrains
2024-10-16 21:44:39,531 [906226501]   INFO - #c.i.w.i.i.j.s.JpsGlobalModelSynchronizerImpl - Saving global entities com.intellij.platform.workspace.jps.entities.SdkEntity to files
2024-10-16 21:44:39,532 [906226502]   INFO - #c.i.w.i.i.j.s.JpsGlobalModelSynchronizerImpl - Saving global entities com.intellij.platform.workspace.jps.entities.LibraryEntity to files

And building directly with gradle:

$ gw spotA build

> Configure project :

> Task :project-processor:compileJava FAILED
/Users/kevin/.../RecordBuilderAnnotationProcessor.java:4: error: package com.palantir.javapoet does not exist
import com.palantir.javapoet.AnnotationSpec;
                            ^
/Users/kevin/.../RecordBuilderAnnotationProcessor.java:5: error: package com.palantir.javapoet does not exist
import com.palantir.javapoet.JavaFile;

I can work around this by using the implementation configuration, but that packages the jar into the application. Since this library is meant to be used at compile time, I just want to use it to generate code at compile time and not have it on the classpath at runtime. I was able to accomplish that with the compileOnly configuration of com.squareup:javapoet.

What did you want to happen?

To get the exact same output as I was getting from square.javapoet.

[skku-daniilkim]

This does not seem like an issue with "javapoet" imo. Have you tried reimporting the project and fully cleaning the build directory?

[kevinm416]

I get the same behavior using gradle directly, so It's not an intellij issue.

[skku-daniilkim]

Could you try version 0.3.0. Perhaps something went wrong after adding the JPMS compatibility.

[kevinm416]

It looks like the same issue as in 0.3.0, but the error is slightly different:

dependencies {
  compileOnly 'com.palantir.javapoet:javapoet:0.3.0'
  compileOnly group: 'com.google.auto.service', name: 'auto-service', version: '1.1.1'
  annotationProcessor group: 'com.google.auto.service', name: 'auto-service', version: '1.1.1'
}

$ ./gradlew build

> Configure project :
Version: 0.7.0-812b668

> Task :model:compileJava FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':model:compileJava'.
> com/palantir/javapoet/AnnotationSpec

Error from inside intellij is the same:

Unable to load class 'com.palantir.javapoet.AnnotationSpec'.
This is an unexpected error. Please file a bug containing the idea.log file.