jenkins 노드 구성 실습 오류 수정

• 원인

  
  

  java 버전 불일치, 필요버전 21/설치된 버전 17

• 해결

  
  

  java 21설치 후 Agent 재실행

• 오류메시지

PM hudson.remoting.UserRequest perform
WARNING: LinkageError while performing UserRequest:hudson.slaves.SlaveComputer$SlaveVersion@f99ef2b
java.lang.UnsupportedClassVersionError: Failed to load hudson.slaves.SlaveComputer$SlaveVersion
        at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:472)
        at hudson.remoting.RemoteClassLoader.loadRemoteClass(RemoteClassLoader.java:301)
        at hudson.remoting.RemoteClassLoader.loadWithMultiClassLoader(RemoteClassLoader.java:277)
        at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:236)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:592)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)
        at java.base/java.lang.Class.forName0(Native Method)
        at java.base/java.lang.Class.forName(Class.java:469)
        at hudson.remoting.MultiClassLoaderSerializer$Input.resolveClass(MultiClassLoaderSerializer.java:133)
        at java.base/java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:2034)
        at java.base/java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1898)
        at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2224)
        at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1733)
        at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:509)
        at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:467)
        at hudson.remoting.UserRequest.deserialize(UserRequest.java:312)
        at hudson.remoting.UserRequest.perform(UserRequest.java:196)
        at hudson.remoting.UserRequest.perform(UserRequest.java:50)
        at hudson.remoting.Request$2.run(Request.java:391)
        at hudson.remoting.InterceptingExecutorService.lambda$wrap$0(InterceptingExecutorService.java:81)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
        at hudson.remoting.Engine$1.lambda$newThread$0(Engine.java:312)
        at java.base/java.lang.Thread.run(Thread.java:840)
Caused by: java.lang.UnsupportedClassVersionError: hudson/slaves/SlaveComputer$SlaveVersion has been compiled by a more recent version of the Java Runtime (class file version 65.0), this version of the Java Runtime only recognizes class file versions up to 61.0
        at java.base/java.lang.ClassLoader.defineClass1(Native Method)
        at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1017)
        at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:879)
        at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:470)