I had the unfortunate luck of upgrading said plug-in. Now any job fails with the error below. The upgrade warning does say: Warning: the new version of this plugin claims to use a different settings format than the installed version. Jobs using this plugin may need to be reconfigured, and/or you may not be able to cleanly revert to the prior version without manually restoring old settings. Consult the plugin release notes for details.
However it is not mentioned how one _can_ resolve this issue once it happened... I downgraded back to 2.0.8 which didn't help. java.lang.AbstractMethodError: org.jenkinsci.plugins.pipeline.modeldefinition.validator.ModelValidatorImpl.validateElement(Lorg/jenkinsci/plugins/pipeline/modeldefinition/ast/ModelASTStage;Z)Z at org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTStage.validate(ModelASTStage.java:78) at org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTStages.validate(ModelASTStages.java:41) at org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTStages.validate(ModelASTStages.java:35) at org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTPipelineDef.validate(ModelASTPipelineDef.java:64) at org.jenkinsci.plugins.pipeline.modeldefinition.ast.ModelASTPipelineDef$validate.call(Unknown Source) at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125) at org.jenkinsci.plugins.pipeline.modeldefinition.parser.ModelParser.parse(ModelParser.groovy:204) at org.jenkinsci.plugins.pipeline.modeldefinition.parser.ModelParser$parse.callCurrent(Unknown Source) at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:166) at org.jenkinsci.plugins.pipeline.modeldefinition.parser.ModelParser.parse(ModelParser.groovy:91) at org.jenkinsci.plugins.pipeline.modeldefinition.parser.GroovyShellDecoratorImpl$1.call(GroovyShellDecoratorImpl.java:46) at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:1053) at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:591) at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:569) at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:546) at groovy.lang.GroovyClassLoader.doParseClass(GroovyClassLoader.java:298) at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:268) at groovy.lang.GroovyShell.parseClass(GroovyShell.java:688) at groovy.lang.GroovyShell.parse(GroovyShell.java:700) at org.jenkinsci.plugins.workflow.cps.CpsGroovyShell.doParse(CpsGroovyShell.java:129) at org.jenkinsci.plugins.workflow.cps.CpsGroovyShell.reparse(CpsGroovyShell.java:123) at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.parseScript(CpsFlowExecution.java:517) at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.start(CpsFlowExecution.java:480) at org.jenkinsci.plugins.workflow.job.WorkflowRun.run(WorkflowRun.java:253) at hudson.model.ResourceController.execute(ResourceController.java:98) at hudson.model.Executor.run(Executor.java:405) Finished: FAILURE -- You received this message because you are subscribed to the Google Groups "Jenkins Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to jenkinsci-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/jenkinsci-users/2d57f4bc-39b8-400a-8d0a-e3f01a5b6fcf%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.