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java.lang.NullPointerException: 	at org.apache.jasper.runtime.JspRuntimeLibrary.internalIntrospecthelper(JspRuntimeLibrary.java:321)	at org.apache.jasper.runtime.JspRuntimeLibrary.introspecthelper(JspRuntimeLibrary.java:307)	at org.apache.jsp.TestuseBean_jsp._jspService(TestuseBean_jsp.java:60)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)	at java.lang.Thread.run(Thread.java:619)