java.lang.NullPointerException: null

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    Root Cause Analysis

    1. java.lang.NullPointerException

      null

      at controller.TaskController.showMain()
    2. controller
      TaskController.showMain
      1. controller.TaskController.showMain(TaskController.java:24)[main/:na]
      1 frame
    3. Java RT
      Method.invoke
      1. sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[na:1.8.0_92]
      2. sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)[na:1.8.0_92]
      3. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[na:1.8.0_92]
      4. java.lang.reflect.Method.invoke(Method.java:498)[na:1.8.0_92]
      4 frames
    4. Spring
      HandlerMethodInvoker.invokeHandlerMethod
      1. org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:180)[spring-web-4.3.2.RELEASE.jar:4.3.2.RELEASE]
      1 frame
    5. Spring MVC
      FrameworkServlet.doGet
      1. org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:440)[spring-webmvc-4.3.2.RELEASE.jar:4.3.2.RELEASE]
      2. org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:428)[spring-webmvc-4.3.2.RELEASE.jar:4.3.2.RELEASE]
      3. org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)[spring-webmvc-4.3.2.RELEASE.jar:4.3.2.RELEASE]
      4. org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)[spring-webmvc-4.3.2.RELEASE.jar:4.3.2.RELEASE]
      5. org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)[spring-webmvc-4.3.2.RELEASE.jar:4.3.2.RELEASE]
      6. org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)[spring-webmvc-4.3.2.RELEASE.jar:4.3.2.RELEASE]
      6 frames
    6. JavaServlet
      HttpServlet.service
      1. javax.servlet.http.HttpServlet.service(HttpServlet.java:622)[tomcat-embed-core-8.0.33.jar:8.0.33]
      1 frame
    7. Spring MVC
      FrameworkServlet.service
      1. org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)[spring-webmvc-4.3.2.RELEASE.jar:4.3.2.RELEASE]
      1 frame
    8. JavaServlet
      HttpServlet.service
      1. javax.servlet.http.HttpServlet.service(HttpServlet.java:729)[tomcat-embed-core-8.0.33.jar:8.0.33]
      1 frame
    9. Glassfish Core
      ApplicationFilterChain.doFilter
      1. org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)[tomcat-embed-core-8.0.33.jar:8.0.33]
      2. org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)[tomcat-embed-core-8.0.33.jar:8.0.33]
      2 frames
    10. Tomcat WS
      WsFilter.doFilter
      1. org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)[tomcat-embed-websocket-8.0.33.jar:8.0.33]
      1 frame
    11. Glassfish Core
      CoyoteAdapter.service
      1. org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)[tomcat-embed-core-8.0.33.jar:8.0.33]
      2. org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)[tomcat-embed-core-8.0.33.jar:8.0.33]
      3. org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)[tomcat-embed-core-8.0.33.jar:8.0.33]
      4. org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)[tomcat-embed-core-8.0.33.jar:8.0.33]
      5. org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)[tomcat-embed-core-8.0.33.jar:8.0.33]
      6. org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)[tomcat-embed-core-8.0.33.jar:8.0.33]
      7. org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)[tomcat-embed-core-8.0.33.jar:8.0.33]
      8. org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)[tomcat-embed-core-8.0.33.jar:8.0.33]
      9. org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)[tomcat-embed-core-8.0.33.jar:8.0.33]
      9 frames
    12. Grizzly HTTP
      NioEndpoint$SocketProcessor.run
      1. org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)[tomcat-embed-core-8.0.33.jar:8.0.33]
      2. org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)[tomcat-embed-core-8.0.33.jar:8.0.33]
      3. org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1502)[tomcat-embed-core-8.0.33.jar:8.0.33]
      4. org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1458)[tomcat-embed-core-8.0.33.jar:8.0.33]
      4 frames
    13. Java RT
      ThreadPoolExecutor$Worker.run
      1. java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[na:1.8.0_92]
      2. java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[na:1.8.0_92]
      2 frames
    14. Tomcat Util
      TaskThread$WrappingRunnable.run
      1. org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)[tomcat-embed-core-8.0.33.jar:8.0.33]
      1 frame
    15. Java RT
      Thread.run
      1. java.lang.Thread.run(Thread.java:745)[na:1.8.0_92]
      1 frame