Run as Maven build fails with Eclipse JRE

[xazap]

Summary

When running a Maven build from Eclipse, test failures are observed due to the provides clauses in module-info.java descriptors not being honored. It appears that Eclipse is not using the module path.

Reproduction

I have created a minimal project that reproduces the issue. Please clone this repo

• Select the parent pom.xml in the project explorer and use Run as -> Maven build...
• Set goals as clean test
• Set JRE as the default Eclipse JRE (on my install this points to $ECLIPSE_HOME/plugins/org.eclipse.justj.openjdk.hotspot.jre.full.linux.x86_64_21.0.4.v20240802-1551/jre)
• Run and find that the test fails:

[ERROR] test.project.SomeServiceTest.testFindingProviderInUnitTest -- Time elapsed: 0.014 s <<< ERROR!
java.util.ServiceConfigurationError: No provider implementation found
	at project.spi.SomeService.lambda$getProvider$0(SomeService.java:24)
	at java.base/java.util.Optional.orElseThrow(Optional.java:403)
	at project.spi.SomeService.getProvider(SomeService.java:24)
	at test.project.SomeServiceTest.testFindingProviderInUnitTest(SomeServiceTest.java:13)

Observation

When performing the same reproduction steps but changing the JRE to an Oracle JDK 21 the test passes, proving that the provides clauses in the module descriptor of the test project are used. Behavior therefore appears to differ between Oracle and Eclipse runtimes.

Possibly related is #1812 where the same reproduction project cannot run with Eclipse's build in Junit5 test runner.

Tested under this environment

• OS & version
  Linux 6.8.0-49-generic 49-Ubuntu SMP PREEMPT_DYNAMIC Mon Nov 4 02:06:24 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
• Eclipse IDE/Platform version:
  Version: 2024-09 (4.33.0)
  Build id: 20240905-0614
  No additional plugins installed
• Oracle JDK:
  java version "21.0.4" 2024-07-16 LTS
  Java(TM) SE Runtime Environment (build 21.0.4+8-LTS-274)
  Java HotSpot(TM) 64-Bit Server VM (build 21.0.4+8-LTS-274, mixed mode, sharing)

[jukzi]

This JDT project is not about maven, justj, JDK or project.spi. If you think you found a bug in JDT please boil it down to a reproducer in JDT. By now i can not see the relation to jdt.

[jukzi]

Closing without enough information after months.