Request processing failed; nested exception is java.lang.NullPointerException] with root cause

ゞ浴缸里的玫瑰 2022-05-29 11:43 113阅读 0赞

严重: Servlet.service() for servlet \[SpringMVC\] in context with path \[/ssm\] threw exception \[Request processing failed; nested exception is java.lang.NullPointerException\] with root cause  
java.lang.NullPointerException  
at weihang.service.impl.NovelDetailIServiceImpl.selectByNovelId(NovelDetailIServiceImpl.java:21)  
at weihang.controller.UserController.novelDetail(UserController.java:98)  
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)  
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)  
at java.lang.reflect.Method.invoke(Method.java:498)  
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:175)  
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446)  
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434)  
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)  
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)  
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)  
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)  
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)  
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)  
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)  
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)  
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)  
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)  
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)  
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)  
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)  
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)  
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)  
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)  
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)  
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)  
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1100)  
at org.apache.coyote.AbstractProtocolAbstractConnectionHandler.process(AbstractProtocol.java:687)atorg.apache.tomcat.util.net.NioEndpoint  A b s t r a c t C o n n e c t i o n H a n d l e r . p r o c e s s ( A b s t r a c t P r o t o c o l . j a v a : 687 ) a t o r g . a p a c h e . t o m c a t . u t i l . n e t . N i o E n d p o i n t SocketProcessor.doRun(NioEndpoint.java:1520)  
at org.apache.tomcat.util.net.NioEndpointSocketProcessor.run(NioEndpoint.java:1476)atjava.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)atjava.util.concurrent.ThreadPoolExecutor  S o c k e t P r o c e s s o r . r u n ( N i o E n d p o i n t . j a v a : 1476 ) a t j a v a . u t i l . c o n c u r r e n t . T h r e a d P o o l E x e c u t o r . r u n W o r k e r ( T h r e a d P o o l E x e c u t o r . j a v a : 1149 ) a t j a v a . u t i l . c o n c u r r e n t . T h r e a d P o o l E x e c u t o r Worker.run(ThreadPoolExecutor.java:624)  
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)  
at java.lang.Thread.run(Thread.java:748)  
这个报错是因为在impl实现接口的时候,从mapper里面申明接口的时候没有加上@Resource注解,加上即可  
![这里写图片描述][70]

[70]: /images/20220529/50e1e4d877c740caa2e8fa79f3d7d217.png

Request processing failed; nested exception is java.lang.NullPointerException] with root cause

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