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    Look if your classpath is correct, and check if the versions of your libraries match the version you described in your pom.xml

Solutions on the web

via GitHub by gmacario
, 1 year ago
java.lang.NoClassDefFoundError: hudson/plugins/copyartifact/BuildSelector
via GitHub by jimarasim
, 1 year ago
java.lang.NoClassDefFoundError: com/cloudbees/hudson/plugins/folder/AbstractFolderPropertyDescriptor
via Jenkins JIRA by Artur Gajowy, 1 year ago
java.lang.NoClassDefFoundError: hudson/plugins/copyartifact/BuildSelector
via Google Groups by gauthamrathinakumar@gmail.com (JIRA), 2 years ago
java.lang.NoClassDefFoundError: org/jenkinsci/plugins/workflow/steps/AbstractStepDescriptorImpl
via Jenkins JIRA by Gautham Rathina kumar, 1 year ago
java.lang.NoClassDefFoundError: org/jenkinsci/plugins/workflow/steps/AbstractStepDescriptorImpl
via jenkins-ci.org by Unknown author, 2 years ago
java.lang.NoClassDefFoundError: org/jenkinsci/plugins/workflow/steps/AbstractStepDescriptorImpl
java.lang.NoClassDefFoundError: hudson/plugins/copyartifact/BuildSelector	at java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClass(ClassLoader.java:760)	at jenkins.util.AntClassLoader.defineClassFromData(AntClassLoader.java:1139)	at hudson.ClassicPluginStrategy$AntClassLoader2.defineClassFromData(ClassicPluginStrategy.java:801)	at jenkins.util.AntClassLoader.getClassFromStream(AntClassLoader.java:1310)	at jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1366)	at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1326)	at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at jenkins.ClassLoaderReflectionToolkit.invoke(ClassLoaderReflectionToolkit.java:44)	at jenkins.ClassLoaderReflectionToolkit._findClass(ClassLoaderReflectionToolkit.java:86)	at hudson.PluginManager$UberClassLoader.findClass(PluginManager.java:1188)	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)	at net.java.sezpoz.IndexItem.element(IndexItem.java:134)	at hudson.ExtensionFinder$Sezpoz._find(ExtensionFinder.java:628)	at hudson.ExtensionFinder$Sezpoz.find(ExtensionFinder.java:617)	at hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:388)	at hudson.ExtensionList.load(ExtensionList.java:349)	at hudson.ExtensionList.ensureLoaded(ExtensionList.java:287)	at hudson.ExtensionList.iterator(ExtensionList.java:156)	at hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:381)	at hudson.ExtensionList.load(ExtensionList.java:349)	at hudson.ExtensionList.ensureLoaded(ExtensionList.java:287)	at hudson.ExtensionList.getComponents(ExtensionList.java:167)	at hudson.DescriptorExtensionList.load(DescriptorExtensionList.java:185)	at hudson.ExtensionList.ensureLoaded(ExtensionList.java:287)	at hudson.ExtensionList.iterator(ExtensionList.java:156)	at hudson.ExtensionList.get(ExtensionList.java:147)	at com.cloudbees.jenkins.GitHubPushTrigger$DescriptorImpl.get(GitHubPushTrigger.java:329)	at org.jenkinsci.plugins.github.migration.Migrator.migrate(Migrator.java:41)	at org.jenkinsci.plugins.github.GitHubPlugin.postInitialize(GitHubPlugin.java:39)	at hudson.PluginManager$2$1$2.run(PluginManager.java:403)	at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)	at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)	at jenkins.model.Jenkins$8.runTask(Jenkins.java:924)	at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)	at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)