Unsupported major.minor version 52.0 (unable to load class XXX

時間 2019-11-17

標籤 unsupported major.minor minor version 52.0 unable load class 简体版

原文原文鏈接

java項目構建從高版本JDK改成低版本JDK報錯。這是再次編譯時使用的JDK版本比你原來編譯的版本低所致使的。maven項目在服務器上構建時報錯（Unsupported major.minor version 52.0 ）：java

java.lang.UnsupportedClassVersionError: com/byron4j/listener/InitListener : Unsupported major.minor version 52.0 (unable to load class com.byron4j.listener.InitListener)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2961)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1210)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1690)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:506)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:488)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:115)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4932)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5528)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1095)
at org.apache.catalina.startup.HostConfigDeployWar.run(HostConfig.java:1930)atjava.util.concurrent.ExecutorsRunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)

部署到linux服務器上以後，啓動項目時報Unsupported major.minor version 52.0 錯誤，檢查發現是linux服務器上JDK版本太低致使的，而後將項目指定JDK版本爲1.7，再發布啓動OK了。linux

JDK版本在官方對應的版本號列表以下：apache

JDK 8.0 = 52,
JDK 7.0 = 51,
JDK 6.0 = 50,
JDK 5.0 = 49,
JDK 1.4 = 48,
JDK 1.3 = 47,
JDK 1.2 = 46,
JDK 1.1 = 45

正是指定的JDK版本爲52，可是因爲服務器是JDK 7致使引起Unsupported major.minor version 52.0服務器

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