tomcat启动报异常：Caused by: java.lang.UnsupportedClassVersionError

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部署项目至测试环境遭遇UnsupportedClassVersionError异常，源于本地与测试环境JDK版本不一致，本地为1.8，测试环境为1.7。文章详细记录了异常堆栈信息，最终通过将测试环境JDK升级至1.8成功解决问题。

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今天，把本地开发的项目部署到测试环境。本地好好的，但是放到系统环境上不行。其中报了许多异常，其中Caused by: java.lang.UnsupportedClassVersionError是导致异常的主要原因。这个异常的意思是，不支持的类版本错误。本地是jdk1.8，检查了测试环境，配置的jdk1.7，需改成1.8后，ok了。下边是报错的一部分，希望能帮到小伙伴^-^

Caused by: java.lang.UnsupportedClassVersionError: org/springframework/web/SpringServletContainerInitializer : Unsupported major.minor version 52.0 (unable to load class [org.springframework.web.SpringServletContainerInitializer])
   at org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2404)
   at org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:859)
   at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1333)
   at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1185)
   at java.lang.Class.forName0(Native Method)
   at java.lang.Class.forName(Class.java:274)
   at org.apache.catalina.startup.WebappServiceLoader.loadServices(WebappServiceLoader.java:188)
   at org.apache.catalina.startup.WebappServiceLoader.load(WebappServiceLoader.java:159)
   at org.apache.catalina.startup.ContextConfig.processServletContainerInitializers(ContextConfig.java:1622)
   at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1129)
   at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:769)
   at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:299)
   at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:94)
   at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5134)
   at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
   ... 10 more

10-Apr-2019 12:04:42.805 SEVERE [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Error deploying web application directory [/home/work/kaowu-algorithm-service/webapps/ROOT]
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
   at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:758)
   at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:730)
   at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
   at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1135)
   at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1870)
   at java.util.concurrent.Executors$RunnableAdapter.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)