这种情况怎么解决，是不是jdk的问题

Question

ERROR org.apache.struts2.dispatcher.DefaultDispatcherErrorHandler - Exception occurred during processing request: null
java.lang.NullPointerException
at action.LoginAction.checkLogin(LoginAction.java:12) ~[classes/:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_112]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_112]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_112]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_112]
at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:897) ~[ognl-3.0.21.jar:?]
at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1299) ~[ognl-3.0.21.jar:?]
at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68) ~[ognl-3.0.21.jar:?]
at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108) ~[xwork-core-2.3.34.jar:2.3.34]
at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1375) ~[ognl-3.0.21.jar:?]
at ognl.ASTMethod.getValueBody(ASTMethod.java:91) ~[ognl-3.0.21.jar:?]
at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212) ~[ognl-3.0.21.jar:?]
at ognl.SimpleNode.getValue(SimpleNode.java:258) ~[ognl-3.0.21.jar:?]
at ognl.Ognl.getValue(Ognl.java:470) ~[ognl-3.0.21.jar:?]
at ognl.Ognl.getValue(Ognl.java:434) ~[ognl-3.0.21.jar:?]
at com.opensymphony.xwork2.ognl.OgnlUtil$3.execute(OgnlUtil.java:362) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecuteMethod(OgnlUtil.java:414) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.ognl.OgnlUtil.callMethod(OgnlUtil.java:360) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:430) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:290) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:251) ~[xwork-core-2.3.34.jar:2.3.34]
at org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41) ~[struts2-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256) ~[struts2-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:168) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265) ~[xwork-core-2.3.34.jar:2.3.34]
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:76) ~[struts2-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73) ~[struts2-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125) ~[struts2-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91) ~[struts2-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:253) ~[struts2-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:140) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) ~[struts2-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189) ~[xwork-core-2.3.34.jar:2.3.34]
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) ~[xwork-core-2.3.34.jar:2.3.34]
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54) ~[struts2-core-2.3.34.jar:2.3.34]
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:575) [struts2-core-2.3.34.jar:2.3.34]
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81) [struts2-core-2.3.34.jar:2.3.34]
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99) [struts2-core-2.3.34.jar:2.3.34]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [catalina.jar:8.5.9]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [catalina.jar:8.5.9]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) [catalina.jar:8.5.9]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [catalina.jar:8.5.9]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474) [catalina.jar:8.5.9]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [catalina.jar:8.5.9]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [catalina.jar:8.5.9]
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624) [catalina.jar:8.5.9]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [catalina.jar:8.5.9]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349) [catalina.jar:8.5.9]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783) [tomcat-coyote.jar:8.5.9]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-coyote.jar:8.5.9]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:789) [tomcat-coyote.jar:8.5.9]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1437) [tomcat-coyote.jar:8.5.9]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-coyote.jar:8.5.9]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_112]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_112]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.5.9]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_112]
这种情况是jdk出问题了吗？要怎么解决这个问题

Answer 1

这个报错提示空指针。request:null 你可以看看你的接口 传参有没有问题，具体是LoginAction.checkLogin这个接口在LoginAction.java:12 12行