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

电玩女神 2022-12-27 14:17 140阅读 0赞

**类型** 异常报告

**消息** Request processing failed; nested exception is java.lang.NullPointerException

**描述** 服务器遇到一个意外的情况，阻止它完成请求。

## ##

### 报错原因：这种报错原因很多，主要是某一个变量为空，所以教主要的解决方法流程和例题 ###

### 报错详细信息： ###

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
    	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:986)
    	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:881)
    	javax.servlet.http.HttpServlet.service(HttpServlet.java:652)
    	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855)
    	javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
    	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
    	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    根本原因。
    
    java.lang.NullPointerException
    	com.supermarket.controller.UserController.login(UserController.java:31)
    	java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    	java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    	java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    	java.base/java.lang.reflect.Method.invoke(Method.java:564)
    	org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209)
    	org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
    	org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
    	org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:871)
    	org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:777)
    	org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
    	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)
    	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
    	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
    	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:881)
    	javax.servlet.http.HttpServlet.service(HttpServlet.java:652)
    	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855)
    	javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
    	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
    	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

# 出错的地方: #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDgxMjU2MA_size_16_color_FFFFFF_t_70][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDgxMjU2MA_size_16_color_FFFFFF_t_70]: /images/20221120/336e18502c7b4757835bac07b75d711a.png

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

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