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Author

getting Nullpointer exception what to do,

Ravii Bhai
Greenhorn

Joined: Dec 13, 2008
Posts: 10
First time its executing after deployment... but second or 3rd time i am getting exception by say... what to do.......???











came to DBConnection package111111111111
java.lang.NullPointerException
at SalcalMain.processRequest(SalcalMain.java:40)
at SalcalMain.doPost(SalcalMain.java:74)
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:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:595)
Build Salary values Starts from here.............
came to DBConnection package111111111111
came to DBConnection package111111111111
came to DBConnection package111111111111
came to DBConnection package111111111111
came to DBConnection package111111111111
came to DBConnection package111111111111
came to DBConnection package111111111111
Build Salary values Starts from here.............
came to DBConnection package111111111111
java.lang.NullPointerException
at SalcalMain.processRequest(SalcalMain.java:40)
at SalcalMain.doPost(SalcalMain.java:74)
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:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:595)
Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 41630
    
  55
I suggest you find out which object is null in line 40 of class SalcalMain.


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sudhir nim
Ranch Hand

Joined: Aug 29, 2007
Posts: 212

Can you post the code of SalcalMain.java file? It will help in identifying the root cause of the NPE.


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It is sorta covered in the JavaRanch Style Guide.
 
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