[GROOVY-10937] record + lombok + groovy == Cannot specify duplicate annotation on the same member : lombok.NonNull

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 4.0.9
• Fix Version/s: 4.0.10
• Component/s: Compiler
• Labels: annotations
• Assignee: Eric Milles
• Reporter: Marcin Zajaczkowski
• Created: 15/Feb/23 00:20
• Updated: 13/Mar/23 12:15
• Resolved: 24/Feb/23 00:02

Description

I've bumped into a strange looking compilation error in a project using JDK 17 record, Lombok's @NotNull and Groovy for tests. It took me a while to find a construction which causes that, as:

1. Compilation error occurs in a Groovy class not related to the problematic Java record.
2. Groovy class must have (non related) inner interface or class.
3. Record has must have two (or more) fields with @NotNull annotation from Lombok.
4. Some (other) Groovy class has to refer to that record.

For example:

// Java
public record SampleRecordWithNonNullFromLombok(
        @NonNull
        String nonNullField,
        @NonNull        //Two or more @NulNull annotated fields are required to trigger the problem
        String nonNullField2
) {}

//Groovy
class ClassWithReferenceToRecord {
    private SampleRecordWithNonNullFromLombok sampleRecord
}

class ReproducerClass {  //it fails to compile

    interface RequiredToReproduceProblem {
    }
}

The error is:

[ERROR] Failed to execute goal org.codehaus.gmavenplus:gmavenplus-plugin:1.13.1:compileTests (default) on project record-lombok-groovy: Error occurred while calling a method on a Groovy class from classpath.: InvocationTargetException: startup failed:
[ERROR] .../ReproducerClass.groovy: -1: Cannot specify duplicate annotation on the same member : lombok.NonNull
[ERROR]  @ line -1, column -1.
[ERROR] 1 error

I created a shrank version of a reproducer:

https://github.com/szpak/code-examples-and-poc/tree/master/record-lombok-groovy

 

It might be a problem with the way how Lombok generates .class for Java record, however, I start here as Groovy compilation is the final reason.

I have observed that error occasionally with Groovy 3(.0.14), but it occurs every time with 4(0.9).