java.lang.NullPointerException

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