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java.lang.NullPointerException: 	at org.apache.tomcat.loader.AdaptiveClassLoader.loadClass(AdaptiveClassLoader.java:471)	at org.apache.tomcat.loader.AdaptiveServletLoader.loadClass(AdaptiveServletLoader.java:174)	at org.apache.tomcat.core.ServletWrapper.loadServlet(ServletWrapper.java:265)	at org.apache.tomcat.core.ServletWrapper.init(ServletWrapper.java:289)	at org.apache.tomcat.core.Handler.service(Handler.java:254)	at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)	at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:812)	at org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)	at org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnection(Ajp12ConnectionHandler.java:166)	at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)	at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)	at java.lang.Thread.run(Thread.java:484)