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 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:756) at java.lang.ClassLoader.defineClass(ClassLoader.java:635) at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:458) Caused: java.lang.UnsupportedClassVersionError: Failed to load com.trilead.ssh2.ServerHostKeyVerifier at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:460) at hudson.remoting.RemoteClassLoader.loadRemoteClass(RemoteClassLoader.java:292) at hudson.remoting.RemoteClassLoader.loadWithMultiClassLoader(RemoteClassLoader.java:269) at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:228) at java.lang.ClassLoader.loadClass(ClassLoader.java:418) at java.lang.ClassLoader.loadClass(ClassLoader.java:351) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:756) at java.lang.ClassLoader.defineClass(ClassLoader.java:635) at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:458) Also: hudson.remoting.Channel$CallSiteStackTrace: Remote call to DockerServer at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1784) at hudson.remoting.UserRequest$ExceptionResponse.retrieve(UserRequest.java:356) at hudson.remoting.Channel.call(Channel.java:1000) at hudson.FilePath.act(FilePath.java:1194) at hudson.FilePath.act(FilePath.java:1183) at org.jenkinsci.plugins.gitclient.Git.getClient(Git.java:140) at hudson.plugins.git.GitSCM.createClient(GitSCM.java:916) at hudson.plugins.git.GitSCM.createClient(GitSCM.java:847) at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1297) at org.jenkinsci.plugins.workflow.steps.scm.SCMStep.checkout(SCMStep.java:129) at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:97) at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:84) at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution.lambda$start$0(SynchronousNonBlockingStepExecution.java:47) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:834) Caused: java.lang.UnsupportedClassVersionError: Failed to load org.jenkinsci.plugins.gitclient.verifier.AbstractJGitHostKeyVerifier at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:460) at hudson.remoting.RemoteClassLoader.loadRemoteClass(RemoteClassLoader.java:292) at hudson.remoting.RemoteClassLoader.loadWithMultiClassLoader(RemoteClassLoader.java:269) at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:228) at java.lang.ClassLoader.loadClass(ClassLoader.java:418) at java.lang.ClassLoader.loadClass(ClassLoader.java:351) at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) at java.lang.Class.getDeclaredMethod(Class.java:2128) at java.io.ObjectStreamClass.getPrivateMethod(ObjectStreamClass.java:1643) at java.io.ObjectStreamClass.access$1700(ObjectStreamClass.java:79) at java.io.ObjectStreamClass$3.run(ObjectStreamClass.java:520) at java.io.ObjectStreamClass$3.run(ObjectStreamClass.java:494) at java.security.AccessController.doPrivileged(Native Method) at java.io.ObjectStreamClass.(ObjectStreamClass.java:494) at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:391) at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:681) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:2003) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1850) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:2003) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1850) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2160) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1667) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2405) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2329) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2187) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1667) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2405) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2329) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2187) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1667) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:503) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:461) at hudson.remoting.UserRequest.deserialize(UserRequest.java:289) at hudson.remoting.UserRequest.perform(UserRequest.java:189) at hudson.remoting.UserRequest.perform(UserRequest.java:54) at hudson.remoting.Request$2.run(Request.java:376) at hudson.remoting.InterceptingExecutorService.lambda$wrap$0(InterceptingExecutorService.java:78) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Also: org.jenkinsci.plugins.workflow.steps.FlowInterruptedException at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.interrupt(CpsFlowExecution.java:1150) at org.jenkinsci.plugins.workflow.job.WorkflowRun$2.lambda$interrupt$0(WorkflowRun.java:397) at jenkins.security.ImpersonatingScheduledExecutorService$1.run(ImpersonatingScheduledExecutorService.java:67) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304) Caused: java.io.IOException: Remote call on DockerServer failed at hudson.remoting.Channel.call(Channel.java:1004) at hudson.FilePath.act(FilePath.java:1194) at hudson.FilePath.act(FilePath.java:1183) at org.jenkinsci.plugins.gitclient.Git.getClient(Git.java:140) at hudson.plugins.git.GitSCM.createClient(GitSCM.java:916) at hudson.plugins.git.GitSCM.createClient(GitSCM.java:847) at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1297) at org.jenkinsci.plugins.workflow.steps.scm.SCMStep.checkout(SCMStep.java:129) at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:97) at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:84) at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution.lambda$start$0(SynchronousNonBlockingStepExecution.java:47) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:834)