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java.lang.UnsupportedClassVersionError: org/dkt/javabrains/TestingSer
vlet : Unsupported major.minor version 51.0 (unable to load class org.dkt.javabr
ains.TestingServlet)	at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2893)	at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1170)	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1556)	at org.apache.catalina.startup.WebAnnotationSet.loadClass(WebAnnotationSet.java:480)	at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:130)	at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:66)	at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:381)	at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:858)	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:345)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5161)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1566)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1556)	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:885)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)	at java.lang.Thread.run(Thread.java:619)