Tomcat].[localhost] : Exception Processing ErrorPage[errorCode=0, location=/error]

Spring MVC NullPointerException错误解析
本文详细分析了一个在Spring MVC框架中出现的NullPointerException错误,该错误发生在处理请求的过程中,具体涉及到了主键为空的问题。文章深入探讨了错误的根本原因,并提供了可能的解决方案。

错误

2018-12-30 17:07:07.088 ERROR 6268 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost]           : Exception Processing ErrorPage[errorCode=0, location=/error]

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1013) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.13.jar:9.0.13]

原因

组成主键是有一为空了,

     Locale locale = Locale.getDefault();
[ERROR] 2025-06-12 21:43:10.104 org.apache.catalina.core.ContainerBase.[Tomcat].[localhost] log 175 [http-nio-80-exec-9] Exception Processing ErrorPage[errorCode=0, location=/error] org.apache.catalina.connector.ClientAbortException: java.io.IOException: Connection reset by peer at org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:310) at org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:273) at org.apache.catalina.connector.CoyoteOutputStream.flush(CoyoteOutputStream.java:118) at java.base/java.io.FilterOutputStream.flush(FilterOutputStream.java:153) at com.fasterxml.jackson.core.json.UTF8JsonGenerator.flush(UTF8JsonGenerator.java:1178) at com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:1008) at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:346) at org.springframework.http.converter.AbstractGenericHttpMessageConverter.write(AbstractGenericHttpMessageConverter.java:104) at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:277) at org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:219) at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:82) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:123) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(Reques
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06-17
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