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Pease check, Thanks   root@ubuntu:/opt/machineagent# ./bin/machine-agent Using java executable at /usr/bin/java Using Java Version [11.0.7] for Agent Using Agent Version [Machine Agent v20.5.1-2635 GA compatible with 4.4.1.0 Build Date 2020-05-27 21:53:51] ERROR StatusLogger Reconfiguration failed: No configuration found for '8bcc55f' at 'null' in 'null' [INFO] Agent logging directory set to: [/opt/machineagent/logs] Could not start up the machine agent due to: javax/annotation/PreDestroy Please see startup.log in the current working directory for details.   root@ubuntu:/opt/machineagent# cat startup.log Thu Jun 11 09:30:03 UTC 2020 java.lang.NoClassDefFoundError: javax/annotation/PreDestroy at com.appdynamics.voltron.AppLifecycleModule.<clinit>(AppLifecycleModule.java:53) at com.appdynamics.voltron.FrameworkBootstrap.start(FrameworkBootstrap.java:157) at com.appdynamics.voltron.FrameworkBootstrap.startAndRun(FrameworkBootstrap.java:120) at com.appdynamics.voltron.FrameworkApplication.start(FrameworkApplication.java:31) at com.appdynamics.agent.sim.Main.startSafe(Main.java:62) at com.appdynamics.agent.sim.bootstrap.Bootstrap.main(Bootstrap.java:45) Caused by: java.lang.ClassNotFoundException: javax.annotation.PreDestroy at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522) ... 6 more ... View more