Kafka CMAK only recognizes class file versions up to 52.0
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1. 现象
在进入 CMAK UI 界面时报如下异常：
2020-10-11 16:09:04,043 - [ERROR] a.a.ActorSystemImpl - Uncaught error from thread [application-akka.actor.default-dispatcher-8]: controllers/routes 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, shutting down JVM since \'akka.jvm-exit-on-fatal-error\' is enabled for ActorSystem[application]
java.lang.UnsupportedClassVersionError: controllers/routes 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:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
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