servlets - Error on web server=====>java.lang.NullPointerException -

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I have created a simple servlet dynamic project with some html pages, ....

Clicks On the form, the button on the form should be transferred to the servlet, I do not know what the problem is, it shows an "HTTP status 500" error .... This shows the error as:

the exception appears on the browser: java.lang.NullPointerException controller.Trafcontrol.doGet (Trafcontrol.java:48) javax.servlet.http.HttpServlet.service (HttpServlet.java:690) javax.servlet.http.HttpServlet.service ( HttpServlet. Jaw : 803) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter (ReplyHeaderFilter.java:96)

Used the App server: JBOSS AS 4.2.2, Eclipse: Helios 3.6 ..

I need to pass the servlet for my control, so I can process further with my project.

I also include the "console" window content: 

  Servlet.service () Exception for servlet servname thrown at java.lang.NullPointerException controller. Kantrolkdeget (Traf contract. Jawaः 48) on JavaxkservletkhttpkHttpServletkservice (HttpServletkjava:690) JavaxkservletkhttpkHttpServletkservice on org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (HttpServlet .java: 803) (the ApplicationFilterChain.java: 290) ApplicationFilterChain.java on org.apache.catalina.core.ApplicationFilterChain.doFilter (org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter (ReplyHeaderFilter.java:96: 206)) org.apache.catalina.core at .ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.javacember35) org.apache.catalin On a.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:206) org.jboss org.apache.catalina.core.StandardContextValve.invoke on org.apache.catalina.core.StandardWrapperValve.invoke (StandardWrapperValve.java:230). On web.tomcat.security.SecurityAssociationValve.invoke (SecurityAssociationValve.java:182) (StandardContextValve.java:175) on org.jboss.web.tomcat.security. Jccontextvalve.invoke (jaccontextvalve.java:84) ve.invoke (StandardHostValve.java:127) org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:102) org on org.apache.catalina.core.StandardHostVal. on jboss.web.tomcat.service.jca.CachedConnectionValve.invoke (on CachedConnectionValve.java: 157) org.apache.catalina.core.StandardEngineValve.invoke (StandardEngineValve.java:109) on org.apache.coyote.http11.Http11Processor Org.apache.catalina.connector.CoyoteAdapter.service (CoyoteAdapter.javamore62) at .process (Http11Processor.java:844) at   
 org.apache.coyote.http11.Http11Protocol $ Http11ConnectionHandler.process (Http11Protocol.javaitter83) at org.apache.tomcat.util Net.JIoEndpoint $ Worker.run (JIoEndpoint.java:446) at java.lang.Thread.run (unknown source) ` 
 Please help any one on this, tHX .....   
 
 
 The error is very clear. You have a NullPointerException in your  Trafcontrol.java  line 48. You probably have to check out your own code, to exit your code using the Eclispe debugging feature.

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