java.lang.NullPointerException

Coderanch | Gustavo Siqueira | 5 years ago
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    How to access a Singleton for get connection to database ?

    Coderanch | 5 years ago | Gustavo Siqueira
    java.lang.NullPointerException

    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at myPackage.myClassHere()
    2. Unknown
      myPackage.myClassHere
      1. myPackage.myClassHere(MYCLASS.java:30)
      1 frame
    3. org.apache.jsp
      Default_jsp._jspService
      1. org.apache.jsp.Default_jsp._jspService(Default_jsp.java:226)
      1 frame
    4. GWT dev
      HttpJspBase.service
      1. org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
      1 frame
    5. JavaServlet
      HttpServlet.service
      1. javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      1 frame
    6. GWT dev
      JspServlet.service
      1. org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
      2. org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
      3. org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
      3 frames
    7. JavaServlet
      HttpServlet.service
      1. javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      1 frame
    8. Glassfish Core
      CoyoteAdapter.service
      1. org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
      2. org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      3. org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
      4. org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
      5. org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
      6. org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
      7. org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
      8. org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
      9. org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
      10. org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
      10 frames
    9. Grizzly HTTP
      JIoEndpoint$SocketProcessor.run
      1. org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1001)
      2. org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
      3. org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
      3 frames
    10. Java RT
      Thread.run
      1. java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
      2. java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
      3. java.lang.Thread.run(Thread.java:722)
      3 frames