Java 21 issue with test fixtures plugin

Help/Discuss
1

Hello,

I’m currently migrating a Spring boot based java application to java 21 and gradle 8.5. I’ve been able to use java 21 in runtime with a docker, and my build process ends well but if I try to use test fixtures in my build, it breaks with the following error.

 Task :library:potato:compileTestFixturesGroovy FAILED

* What went wrong:
Execution failed for task ':library:potato:compileTestFixturesGroovy'.
> BUG! exception in phase 'semantic analysis' in source unit '/Users/tomato/code/gh/project/library/potato/src/testFixtures/groovy/com/potato/PotatoDataFactory.groovy' Unsupported class file major version 65

My project structure is composed of a main service that bundles some libraries from the same build, and those libraries often expose fixtures to help us proving test data for internal use. Those are direct project dependencies.

------------------------------------------------------------
Gradle 8.5
------------------------------------------------------------

Build time:   2023-11-29 14:08:57 UTC
Revision:     28aca86a7180baa17117e0e5ba01d8ea9feca598

Kotlin:       1.9.20
Groovy:       3.0.17
Ant:          Apache Ant(TM) version 1.10.13 compiled on January 4 2023
JVM:          21.0.2 (Azul Systems, Inc. 21.0.2+13-LTS)
OS:           Mac OS X 14.3 aarch64

It seems to me that it is possible that the java-test-fixtures plugin might not be reading properly the java toolchain configuration that I’m using to specify the language version

    java {
        toolchain {
            languageVersion = JavaLanguageVersion.of(21)
        }
    }

Can you help me? , thanks in advance.

2

You are probably using a Groovy version that is not Java 21 compatible

3

I though that but I’m using this in my code, should I add something else?

build.gradle (library potato)
testFixturesImplementation libs.groovy

(settings.gradle)
library('groovy','org.apache.groovy:groovy:4.0.4')
4

Are you sure 4.0.4 is Java 21 compatible?
Try with 4.0.18.

5

It seems that indeed that was the issue, after upgrading to 4.0.18 fixtures are working fine.

Thank you

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