运行Tomcat时报java.lang.UnsupportedClassVersionError: oracle/demo/oow/bd/ui/IsUserLogued

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错误详情：

java.lang.UnsupportedClassVersionError: oracle/demo/oow/bd/ui/IsUserLogued : Unsupported major.minor version 52.0 (unable to load class oracle.demo.oow.bd .ui.IsUserLogued)at org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2570)at org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:859)at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1302)at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1167)at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:509)at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:490)at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:118)at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:258)at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:105)at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4700)at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5340)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:753)at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:729)at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:976)at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1853)at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:473)at java.util.concurrent.FutureTask.run(FutureTask.java:262)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1152)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:622)at java.lang.Thread.run(Thread.java:748)

问题产生原因：

因为虚拟机会自带jdk 1.7.0而我们本地是jdk 1.8.0，两个版本不匹配，所以会导致这个问题。

解决方案：

①删除当前的jdk 1.7.0（在root权限下，运行shell命令）

yum remove java

②将下载到虚拟机上并配置好的jdk 1.8.0生效

source /etc/java

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