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Bug
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Resolution: Won't Fix
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Minor
This causes trouble for scripted pipelines testing, e.g. when using jenkins-spock library:
Could not initialize class org.jenkinsci.plugins.workflow.cps.CpsThread java.lang.NoClassDefFoundError: Could not initialize class org.jenkinsci.plugins.workflow.cps.CpsThread at org.jenkinsci.plugins.workflow.cps.CpsScript.<init>(CpsScript.java:69) at org.spockframework.mock.runtime.MockInstantiator.instantiate(MockInstantiator.java:33) at org.spockframework.mock.runtime.ProxyBasedMockFactory$CglibMockFactory.createMock(ProxyBasedMockFactory.java:155) at org.spockframework.mock.runtime.ProxyBasedMockFactory.create(ProxyBasedMockFactory.java:68) at org.spockframework.mock.runtime.JavaMockFactory.createInternal(JavaMockFactory.java:59) at org.spockframework.mock.runtime.JavaMockFactory.create(JavaMockFactory.java:40) at org.spockframework.mock.runtime.CompositeMockFactory.create(CompositeMockFactory.java:44) at org.spockframework.lang.SpecInternals.createMock(SpecInternals.java:51) at org.spockframework.lang.SpecInternals.createMockImpl(SpecInternals.java:296) at org.spockframework.lang.SpecInternals.createMockImpl(SpecInternals.java:286) at org.spockframework.lang.SpecInternals.SpyImpl(SpecInternals.java:161) at com.homeaway.devtools.jenkins.testing.JenkinsPipelineSpecification.setup(JenkinsPipelineSpecification.groovy:1025)
[JENKINS-59762] Static initialization block prevents mocking CpsThread
Kamil Szymański
added a comment - The reported problem was the result of having older version of groovy-cps on the classpath that got pulled in transitively hence the issue can be closed.
Nevertheless I'd say that merging https://github.com/jenkinsci/workflow-cps-plugin/pull/328 or https://github.com/jenkinsci/workflow-cps-plugin/pull/336 would make this issue go away or be easier to debug for the ones to stumble upon it in the future.
Kamil Szymański
added a comment - The reported problem was the result of having older version of groovy-cps on the classpath that got pulled in transitively hence the issue can be closed.
Nevertheless I'd say that merging https://github.com/jenkinsci/workflow-cps-plugin/pull/328 or https://github.com/jenkinsci/workflow-cps-plugin/pull/336 would make this issue go away or be easier to debug for the ones to stumble upon it in the future. Kamil Szymański
added a comment - This issue depends on the classpath and can be fixed by managing dependencies by the build tool.
Kamil Szymański
added a comment - This issue depends on the classpath and can be fixed by managing dependencies by the build tool. 
I've submitted a PR that fixes CpsThread mocking issue: https://github.com/jenkinsci/workflow-cps-plugin/pull/328