java.lang.NullPointerException

Coderanch | Cathy Valdez | 1 decade ago
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  1. 0

    cannot activate a web application with database

    Coderanch | 1 decade ago | Cathy Valdez
    java.lang.NullPointerException
  2. 0

    cannot activate a web application with database

    Coderanch | 1 decade ago | Cathy Valdez
    java.lang.NullPointerException
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  4. 0

    cannot activate servlet in the Web browser

    Coderanch | 1 decade ago | Cathy Valdez
    java.lang.NullPointerException

    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at sl314.domain.WordCategoryDAO.selectAllCategories()
    2. sl314.domain
      WordCategoryService.getCategories
      1. sl314.domain.WordCategoryDAO.selectAllCategories(WordCategoryDAO.java:38)
      2. sl314.domain.WordCategoryService.getCategories(WordCategoryService.java:16)
      2 frames
    3. sl314.web
      ScrambleGameServlet.doGet
      1. sl314.web.ScrambleGameServlet.showCategories(ScrambleGameServlet.java:43)
      2. sl314.web.ScrambleGameServlet.doGet(ScrambleGameServlet.java:29)
      2 frames
    4. JavaServlet
      HttpServlet.service
      1. javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
      2. javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
      2 frames
    5. Glassfish Core
      ContainerBase.invoke
      1. org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
      2. org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
      3. org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
      4. org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
      5. org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
      6. org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
      7. org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
      8. org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
      9. org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
      10. org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
      11. org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2416)
      12. org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
      13. org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
      14. org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
      15. org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
      16. org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
      17. org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
      18. org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
      19. org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
      20. org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
      21. org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
      22. org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
      23. org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
      23 frames
    6. org.apache.coyote
      CoyoteAdapter.service
      1. org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
      1 frame
    7. Grizzly HTTP
      TcpWorkerThread.runIt
      1. org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:601)
      2. org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)
      3. org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
      3 frames
    8. Tomcat Util
      ThreadPool$ControlRunnable.run
      1. org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
      1 frame
    9. Java RT
      Thread.run
      1. java.lang.Thread.run(Thread.java:484)
      1 frame