HTTP Status 500 - Request processing failed; nested exception is java.lang.NullPointerException

type Exception report

message Request processing failed; nested exception is java.lang.NullPointerException

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:973)
	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	com.zhishang.class_could.filter.FrontLoginFilter.doFilter(FrontLoginFilter.java:65)
	com.zhishang.class_could.filter.InjectionFilter.doFilter(InjectionFilter.java:35)
	com.thetransactioncompany.cors.CORSFilter.doFilter(CORSFilter.java:208)
	com.thetransactioncompany.cors.CORSFilter.doFilter(CORSFilter.java:274)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
	org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:164)
	org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:80)
	org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
	org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)

root cause

java.lang.NullPointerException
	com.zhishang.class_could.controller.front.classesgroup.ClassesGroupController.classesGroupDetail(ClassesGroupController.java:142)
	sun.reflect.GeneratedMethodAccessor1016.invoke(Unknown Source)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.lang.reflect.Method.invoke(Method.java:498)
	org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
	org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
	org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
	org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
	org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:690)
	org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	com.zhishang.class_could.filter.FrontLoginFilter.doFilter(FrontLoginFilter.java:65)
	com.zhishang.class_could.filter.InjectionFilter.doFilter(InjectionFilter.java:35)
	com.thetransactioncompany.cors.CORSFilter.doFilter(CORSFilter.java:208)
	com.thetransactioncompany.cors.CORSFilter.doFilter(CORSFilter.java:274)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
	org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:164)
	org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:80)
	org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
	org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)

note The full stack trace of the root cause is available in the Apache Tomcat/8.0.15 logs.


Apache Tomcat/8.0.15