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java.lang.UnsupportedClassVersionError: org/apache/tomcat/websocket/server/WsSci : Unsupported major.minor version 51.0	at java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)	at java.lang.ClassLoader.defineClass(ClassLoader.java:615)	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)	at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)	at java.net.URLClassLoader.access$000(URLClassLoader.java:58)	at java.net.URLClassLoader$1.run(URLClassLoader.java:197)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:249)	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1842)	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1705)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:249)	at org.apache.catalina.startup.WebappServiceLoader.loadServices(WebappServiceLoader.java:192)	at org.apache.catalina.startup.WebappServiceLoader.load(WebappServiceLoader.java:157)	at org.apache.catalina.startup.ContextConfig.processServletContainerInitializers(ContextConfig.java:1577)	at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1281)	at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:889)	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:386)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5460)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1263)	at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1975)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)	at java.lang.Thread.run(Thread.java:662)