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java.lang.NullPointerException: 	at java.util.Hashtable.get(Hashtable.java:336)	at org.apache.tomcat.util.http.Parameters.getParameterValues(Parameters.java:193)	at org.apache.tomcat.util.http.Parameters.getParameter(Parameters.java:238)	at org.apache.catalina.connector.Request.getParameter(Request.java:1007)	at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:353)	at com.amkor.stripmap.ControllerServlet.doPost(ControllerServlet.java:34)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)	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:210)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)	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:151)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)	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:685)	at java.lang.Thread.run(Thread.java:595)