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java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet	at java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClass(ClassLoader.java:620)	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)	at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)	at java.net.URLClassLoader.access$100(URLClassLoader.java:56)	at java.net.URLClassLoader$1.run(URLClassLoader.java:195)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)	at java.lang.ClassLoader.loadClass(ClassLoader.java:299)	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)	at java.lang.ClassLoader.loadClass(ClassLoader.java:251)	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1270)	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1201)	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1034)	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:932)	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3951)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4225)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:904)	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:867)	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:474)	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1122)	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:310)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1021)	at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)	at org.apache.catalina.core.StandardService.start(StandardService.java:450)	at org.apache.catalina.core.StandardServer.start(StandardServer.java:709)	at org.apache.catalina.startup.Catalina.start(Catalina.java:551)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)