NoClassDefFoundError java/lang/Module with 1.15 & 1.16 about jenkinspipelineunit HOT 3 CLOSED

Hi @nre-ableton !

I've just seen that I missed #552 which was merged a bit before this issue. We're not using latest LTS (first mandating JDK11), so our pipelines are still JDK8. Luckily, by using toolchains we can easily compile with JDK8 and execute the tests with JDK11, which makes this issue go away. Please feel free to label it as not a bug.

thanks & best regards

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This issue was bugging me so I dug in to figure out what was going on. Building master with JDK 11 results in InterceptingGCL referencing java.lang.Module, and building it with JDK 8 doesn't. That explains the immediate cause, but why should it matter what we build with? InterceptingGCL doesn't mention Module anywhere in the source.

The root cause is groovyc. Whenever a class makes a method call through super, groovyc generates stub methods to handle the call. This is needed to support MOP. Crucially this stub generation is name-based and creates stubs for all overloads of the called method! In this case what happened is Java 9 introduced an overload for loadClass() that has a Module parameter. Groovyc duly copies that signature to InterceptingGCL and breaks back compat.

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JDK 8 is no longer supported, you need at least JDK 11. Can you try to reproduce with JDK 11?

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