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Bug
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Resolution: Duplicate
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Minor
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None
Git-client plugin version 3.11.2 is incompatible with Jenkins workers running Java 8, and leads to the following sort of error:
13:40:43 java.lang.UnsupportedClassVersionError: com/trilead/ssh2/ServerHostKeyVerifier has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0 13:40:43 at java.lang.ClassLoader.defineClass1(Native Method) 13:40:43 at java.lang.ClassLoader.defineClass(ClassLoader.java:756) 13:40:43 at java.lang.ClassLoader.defineClass(ClassLoader.java:635) 13:40:43 at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:458) 13:40:43 Caused: java.lang.UnsupportedClassVersionError: Failed to load com.trilead.ssh2.ServerHostKeyVerifier 13:40:43 at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:460) 13:40:43 at hudson.remoting.RemoteClassLoader.loadRemoteClass(RemoteClassLoader.java:300) 13:40:43 at hudson.remoting.RemoteClassLoader.loadWithMultiClassLoader(RemoteClassLoader.java:269) 13:40:43 at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:228) 13:40:43 at java.lang.ClassLoader.loadClass(ClassLoader.java:418) 13:40:43 at java.lang.ClassLoader.loadClass(ClassLoader.java:351) 13:40:43 at java.lang.ClassLoader.defineClass1(Native Method) 13:40:43 at java.lang.ClassLoader.defineClass(ClassLoader.java:756) 13:40:43 at java.lang.ClassLoader.defineClass(ClassLoader.java:635) 13:40:43 at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:458) 13:40:43 Also: hudson.remoting.Channel$CallSiteStackTrace: Remote call to <HOSTNAME> 13:40:43 at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1784) 13:40:43 at hudson.remoting.UserRequest$ExceptionResponse.retrieve(UserRequest.java:356) 13:40:43 at hudson.remoting.Channel.call(Channel.java:1000) 13:40:43 at hudson.FilePath.act(FilePath.java:1194) 13:40:43 at hudson.FilePath.act(FilePath.java:1183) 13:40:43 at org.jenkinsci.plugins.gitclient.Git.getClient(Git.java:140) 13:40:43 at hudson.plugins.git.GitSCM.createClient(GitSCM.java:916) 13:40:43 at hudson.plugins.git.GitSCM.createClient(GitSCM.java:847) 13:40:43 at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1297) 13:40:43 at hudson.scm.SCM.checkout(SCM.java:540) 13:40:43 at hudson.model.AbstractProject.checkout(AbstractProject.java:1217) 13:40:43 at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:647) 13:40:43 at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:85) 13:40:43 at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:519) 13:40:43 at hudson.model.Run.execute(Run.java:1897) 13:40:43 at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:44) 13:40:43 at hudson.model.ResourceController.execute(ResourceController.java:101) 13:40:43 at hudson.model.Executor.run(Executor.java:442) 13:40:43 Caused: java.lang.UnsupportedClassVersionError: Failed to load org.jenkinsci.plugins.gitclient.verifier.AbstractJGitHostKeyVerifier 13:40:43 at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:460) 13:40:43 at hudson.remoting.RemoteClassLoader.loadRemoteClass(RemoteClassLoader.java:292) 13:40:43 at hudson.remoting.RemoteClassLoader.loadWithMultiClassLoader(RemoteClassLoader.java:269) 13:40:43 at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:228) 13:40:43 at java.lang.ClassLoader.loadClass(ClassLoader.java:418) 13:40:43 at java.lang.ClassLoader.loadClass(ClassLoader.java:351) 13:40:43 at java.lang.Class.getDeclaredMethods0(Native Method) 13:40:43 at java.lang.Class.privateGetDeclaredMethods(Class.java:2729) 13:40:43 at java.lang.Class.getDeclaredMethod(Class.java:2156) 13:40:43 at java.io.ObjectStreamClass.getPrivateMethod(ObjectStreamClass.java:1643) 13:40:43 at java.io.ObjectStreamClass.access$1700(ObjectStreamClass.java:79) 13:40:43 at java.io.ObjectStreamClass$3.run(ObjectStreamClass.java:520) 13:40:43 at java.io.ObjectStreamClass$3.run(ObjectStreamClass.java:494) 13:40:43 at java.security.AccessController.doPrivileged(Native Method) 13:40:43 at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:494) 13:40:43 at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:391) 13:40:43 at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:681) 13:40:43 at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1942) 13:40:43 at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1808) 13:40:43 at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1942) 13:40:43 at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1808) 13:40:43 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2099) 13:40:43 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1625) 13:40:43 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2344) 13:40:43 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2268) 13:40:43 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2126) 13:40:43 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1625) 13:40:43 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2344) 13:40:43 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2268) 13:40:43 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2126) 13:40:43 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1625) 13:40:43 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:465) 13:40:43 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:423) 13:40:43 at hudson.remoting.UserRequest.deserialize(UserRequest.java:289) 13:40:43 at hudson.remoting.UserRequest.perform(UserRequest.java:189) 13:40:43 at hudson.remoting.UserRequest.perform(UserRequest.java:54) 13:40:43 at hudson.remoting.Request$2.run(Request.java:376) 13:40:43 at hudson.remoting.InterceptingExecutorService.lambda$wrap$0(InterceptingExecutorService.java:78) 13:40:43 at java.util.concurrent.FutureTask.run(FutureTask.java:266) 13:40:43 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 13:40:43 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 13:40:43 at java.lang.Thread.run(Thread.java:748) 13:40:43 Caused: java.io.IOException: Remote call on <HOSTNAME> failed 13:40:43 at hudson.remoting.Channel.call(Channel.java:1004) 13:40:43 at hudson.FilePath.act(FilePath.java:1194) 13:40:43 at hudson.FilePath.act(FilePath.java:1183) 13:40:43 at org.jenkinsci.plugins.gitclient.Git.getClient(Git.java:140) 13:40:43 at hudson.plugins.git.GitSCM.createClient(GitSCM.java:916) 13:40:43 at hudson.plugins.git.GitSCM.createClient(GitSCM.java:847) 13:40:43 at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1297) 13:40:43 at hudson.scm.SCM.checkout(SCM.java:540) 13:40:43 at hudson.model.AbstractProject.checkout(AbstractProject.java:1217) 13:40:43 at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:647) 13:40:43 at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:85) 13:40:43 at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:519) 13:40:43 at hudson.model.Run.execute(Run.java:1897) 13:40:43 at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:44) 13:40:43 at hudson.model.ResourceController.execute(ResourceController.java:101) 13:40:43 at hudson.model.Executor.run(Executor.java:442)
We are unable to upgrade Java on these workers (they alone are pinned to Java 8 because we still need it around for a couple of things). We solved the issue by downgrading to version 3.11.0, but of course we would like to have the security fixes. Would it be possible to recompile the plugin such that it retains compatibility with Java 8?
Thanks,
Adam Compton
- duplicates
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- Closed
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[JENKINS-69248] Recent Git-client plugin releases are incompatible with Java 8
Adam Compton
added a comment - Oh, thanks! I wasn't sure if it was a separate plugin or a part of git-client.
Adam Compton
added a comment - Oh, thanks! I wasn't sure if it was a separate plugin or a part of git-client. 
Thanks for reporting the issue. The trilead plugin is the source of the problem. Downgrade from 1.71.v9e7860a_67a_df to 1.67.vc3938a_35172f and the problem will be resolved.