java.lang.NullPointerException

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问问大神,错误在哪,这是一个登录操作。。

5个回答

55行是什么
该不会是userService=null吧

a87b01c14
sanxiaochengyu 回复EricaCHU: 应该是userService=null,你判断下
4 年多之前 回复
EricaCHU
EricaCHU 就是那句userService.validateUser
4 年多之前 回复

只能是validateUser()的错了,看一下你这个方法里面是否有空指针出现,例如把null值(userName||userPwd)传了进去,或者是里面某个对象是null,那些你没有贴出来,不造在哪

EricaCHU
EricaCHU 在validateUser方法里有个条件,有一个return null
4 年多之前 回复

我在ss2搭建时,遇到的错误,报空指异常:
java.lang.NullPointerException
com.test.action.user.RepairManageAction.readyUpdate(RepairManageAction.java:55)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)......
答案就在这里:java.lang.NullPointerException
----------------------Hi,地球人,我是问答机器人小S,上面的内容就是我狂拽酷炫叼炸天的答案,除了赞同,你还有别的选择吗?

问题在第55行,你把出错那行和上下文贴出来吧

EricaCHU
EricaCHU 大神看评论~!
4 年多之前 回复

我改了一下。现在问题在40行图片图片图片图片

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Please check your configuration. 2019-08-05 10:29:13.958 INFO 7416 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$b535b905] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 2019-08-05 10:29:14.332 INFO 7416 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http) 2019-08-05 10:29:14.348 INFO 7416 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2019-08-05 10:29:14.349 INFO 7416 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.28 2019-08-05 10:29:14.355 INFO 7416 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : Loaded APR based Apache Tomcat Native library [1.2.21] using APR version [1.6.5]. 2019-08-05 10:29:14.355 INFO 7416 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true]. 2019-08-05 10:29:14.355 INFO 7416 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true] 2019-08-05 10:29:14.357 INFO 7416 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : OpenSSL successfully initialized [OpenSSL 1.1.1a 20 Nov 2018] 2019-08-05 10:29:14.418 INFO 7416 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2019-08-05 10:29:14.418 INFO 7416 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1462 ms 2019-08-05 10:29:14.514 INFO 7416 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/] 2019-08-05 10:29:14.517 INFO 7416 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*] 2019-08-05 10:29:14.517 INFO 7416 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*] 2019-08-05 10:29:14.517 INFO 7416 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*] 2019-08-05 10:29:14.517 INFO 7416 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*] 2019-08-05 10:29:14.631 INFO 7416 --- [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting... 2019-08-05 10:29:19.625 INFO 7416 --- [ restartedMain] com.zaxxer.hikari.pool.PoolBase : HikariPool-1 - Driver does not support get/set network timeout for connections. 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com.xintujiuzhang.aimanagement.controller.ModuleBrowsingController.jumpTM(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.852 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/log/module_operation],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.ModuleOperationController.jumpMM(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.852 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/deletehandwriting],methods=[POST]}" onto public void com.xintujiuzhang.aimanagement.controller.NotesController.deletehandwriting(java.lang.String) 2019-08-05 10:29:20.852 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/updatehandwriting],methods=[POST]}" onto public void com.xintujiuzhang.aimanagement.controller.NotesController.updatehandwriting(com.xintujiuzhang.aimanagement.pojo.Handwriting) 2019-08-05 10:29:20.852 INFO 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java.lang.NullPointerException
java.lang.NullPointerException java.lang.String.<init>(String.java:228) com.huawei.support.mobile.module.web.jsintf.WebIntf.AesDecrypt(Unknown Source) com.huawei.support.mobile.module.web.jsintf.WebIntf.login(Unknown Source) com.huawei.support.mobile.module.web.ui.HWSupportMobileWebContainer.sendNetState(Unknown Source) com.huawei.support.mobile.module.web.ui.j.onPageFinished(Unknown Source) com.android.webview.chromium.WebViewContentsClientAdapter.onPageFinished(WebViewContentsClientAdapter.java:488) com.android.org.chromium.android_webview.AwContentsClient$AwWebContentsObserver$1.run(AwContentsClient.java:76) android.os.Handler.handleCallback(Handler.java:733) android.os.Handler.dispatchMessage(Handler.java:95) android.os.Looper.loop(Looper.java:136) android.app.ActivityThread.main(ActivityThread.java:5314) java.lang.reflect.Method.invokeNative(Native Method) java.lang.reflect.Method.invoke(Method.java:515) com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864) com.android.internal.os.ZygoteInit.main(ZygoteInit.java:680) dalvik.system.NativeStart.main(Native Method) 求大神解答这个错误是怎么出来的 ,现在就出现了一次
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java 中出现 java.lang.nullpointerexception异常,哪位大神能帮忙处理一下 http://pan.baidu.com/share/link?shareid=3804041701&uk=840289731
Error querying database. Cause: java.lang.NullPointerException
###错误日志 org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: Error querying database. Cause: java.lang.NullPointerException Cause: java.lang.NullPointerException at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:79) at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:447) at com.sun.proxy.$Proxy82.selectOne(Unknown Source) at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:167) at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:75) at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53) at com.sun.proxy.$Proxy180.shareRewardList(Unknown Source) at com.cn.ym.live.hottalk.service.common.impl.UserInfoServiceImpl.shareRewardList(UserInfoServiceImpl.java:82) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) at com.sun.proxy.$Proxy178.shareRewardList(Unknown Source) at com.cn.ym.live.hottalk.controller.UserInfoController.shareRewardList(UserInfoController.java:119) at com.cn.ym.live.hottalk.controller.UserInfoController$$FastClassBySpringCGLIB$$728252b4.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:738) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) at org.springframework.validation.beanvalidation.MethodValidationInterceptor.invoke(MethodValidationInterceptor.java:139) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:85) at com.cn.ym.live.hottalk.aop.WebControllerAop.doAround(WebControllerAop.java:46) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:629) at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:618) at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:673) at com.cn.ym.live.hottalk.controller.UserInfoController$$EnhancerBySpringCGLIB$$e47575b0.shareRewardList(<generated>) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) at javax.servlet.http.HttpServlet.service(HttpServlet.java:661) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129) at com.cn.ym.live.hottalk.aop.MyFilter.doFilter(MyFilter.java:62) at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84) at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131) at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46) at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64) at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60) at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77) at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at io.undertow.servlet.handlers.SessionRestoringHandler.handleRequest(SessionRestoringHandler.java:119) at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292) at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81) at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138) at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135) at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48) at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43) at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272) at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81) at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104) at io.undertow.server.Connectors.executeRootHandler(Connectors.java:211) at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:809) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Caused by: org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: java.lang.NullPointerException ### Cause: java.lang.NullPointerException at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:434) ... 104 common frames omitted Caused by: java.lang.NullPointerException: null at com.cn.ym.live.hottalk.config.db.MyAbstractRoutingDataSource.determineCurrentLookupKey(MyAbstractRoutingDataSource.java:24) at org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource.determineTargetDataSource(AbstractRoutingDataSource.java:196) at org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource.getConnection(AbstractRoutingDataSource.java:164) at com.github.pagehelper.PageHelper.getUrl(PageHelper.java:281) at com.github.pagehelper.PageHelper.getSqlUtil(PageHelper.java:305) at com.github.pagehelper.PageHelper.initSqlUtil(PageHelper.java:263) at com.github.pagehelper.PageHelper.intercept(PageHelper.java:250) at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61) at com.sun.proxy.$Proxy168.query(Unknown Source) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148) ... 111 common frames omitted 2018-12-20 17:20:15.347 WARN 9616 --- [ XNIO-3 task-1] .m.m.a.ExceptionHandlerExceptionResolver : Resolved exception caused by Handler execution: org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: Error querying database. Cause: java.lang.NullPointerException Cause: java.lang.NullPointerException ###mapper.xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN" "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd"> <mapper namespace="com.cn.ym.live.hottalk.dao.UserInviteLogDAO"> <!-- --> <select id="shareRewardList" resultType="ShareReward"> SELECT COUNT(invite_id) as number, SUM(coin) as money FROM hot_user_invite_log </select> ###dao层 public interface UserInviteLogDAO { /** * 日志增加用户邀请奖励 奖励金额 * * @param inviteLog */ public void addCoin(InviteLog inviteLog); /** * 获取邀请码 用户信息 * * @param map uid * @return */ public UserInfo userInviteLogDao(Map<String, Object> map1); /** * 用户获取邀请信息 * * @param uid * @param start_time * @param end_time * @return */ public ShareReward shareRewardList(); ###service @Autowired private UserInviteLogDAO userInviteLogDao; @Autowired private PayOrderDAO payOrderDAO; private static final Logger logger = LoggerFactory.getLogger(UserInfoService.class); /** * 用户获取邀请信息 * @param uid * @param start_time * @param end_time * @return */ public ShareReward shareRewardList(String uid, Long start_time, Long end_time) { Map<String , Object> map =new HashMap<>(); map.put("uid", uid); map.put("start_time", start_time); map.put("end_time", end_time); ShareReward shareReward = userInviteLogDao.shareRewardList(); return shareReward; }
win8 安装oracle11g时报出java.lang.nullpointerexception
win8 安装oracle11g时报出java.lang.nullpointerexception,无法进入安装界面,求解决! 谢谢
多线程 java.lang.NullPointerException
``` Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at javax.swing.plaf.basic.BasicListUI.paintImpl(BasicListUI.java:266) at javax.swing.plaf.basic.BasicListUI.paint(BasicListUI.java:240) at javax.swing.plaf.ComponentUI.update(ComponentUI.java:161) at javax.swing.JComponent.paintComponent(JComponent.java:780) at javax.swing.JComponent.paint(JComponent.java:1056) at javax.swing.JComponent.paintToOffscreen(JComponent.java:5219) at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1572) at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1495) at javax.swing.RepaintManager.paint(RepaintManager.java:1265) at javax.swing.JComponent._paintImmediately(JComponent.java:5167) at javax.swing.JComponent.paintImmediately(JComponent.java:4978) at javax.swing.RepaintManager$4.run(RepaintManager.java:824) at javax.swing.RepaintManager$4.run(RepaintManager.java:807) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:807) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:782) at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:731) at javax.swing.RepaintManager.access$1300(RepaintManager.java:64) at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1720) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) at java.awt.EventQueue.dispatchEvent(EventQueue.java:726) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) ``` ## 我写了个socket通信的小程序,,每次启动一个客户端就创建一个线程专门用来读取Server回复的信息,主线程用来往Server发信息。 ## 有时 ,当我启动到第多个客户端时就会报出该异常,但是程序还是正常运行的。。只是在该客户端控制台输出了这些异常信息,有时一个一个关闭客户端时也会报该异常, 而这些不是我的代码里的东西,,求指导。这是异常是关于什么的。??
java.lang.NullPointerException希望各位大佬帮帮忙,找了半天真的不晓得咋弄了
![程序代码](https://img-ask.csdn.net/upload/201811/27/1543252825_648938.png) HTTP Status 500 – Internal Server Error Type Exception Report Message java.lang.NullPointerException Description The server encountered an unexpected condition that prevented it from fulfilling the request. Exception org.apache.jasper.JasperException: java.lang.NullPointerException org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:565) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:481) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329) javax.servlet.http.HttpServlet.service(HttpServlet.java:742) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) Root Cause java.lang.NullPointerException service.userservice.valiUser(userservice.java:18) org.apache.jsp.validate_jsp._jspService(validate_jsp.java:139) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:742) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329) javax.servlet.http.HttpServlet.service(HttpServlet.java:742) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) Note The full stack trace of the root cause is available in the server logs. Apache Tomcat/8.5.20
java.lang.String[] java.lang.String.split
Error, Qchat service has not been published java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String[] java.lang.String.split(java.lang.String)' on a null object reference![图片说明](https://img-ask.csdn.net/upload/201704/21/1492741965_735268.png) 这个问题怎么解决,求神助。。。
新人求助 java.lang.NullPointerException
04-26 21:42:40.039: E/AndroidRuntime(1125): FATAL EXCEPTION: main 04-26 21:42:40.039: E/AndroidRuntime(1125): Process: com.example.remotecontrol, PID: 1125 04-26 21:42:40.039: E/AndroidRuntime(1125): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.remotecontrol/com.example.remotecontrol.RemoteControlActivity}: java.lang.NullPointerException 04-26 21:42:40.039: E/AndroidRuntime(1125): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2176) 04-26 21:42:40.039: E/AndroidRuntime(1125): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226) 04-26 21:42:40.039: E/AndroidRuntime(1125): at android.app.ActivityThread.access$700(ActivityThread.java:135) 04-26 21:42:40.039: E/AndroidRuntime(1125): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397) 04-26 21:42:40.039: E/AndroidRuntime(1125): at android.os.Handler.dispatchMessage(Handler.java:102) 04-26 21:42:40.039: E/AndroidRuntime(1125): at android.os.Looper.loop(Looper.java:137) 04-26 21:42:40.039: E/AndroidRuntime(1125): at android.app.ActivityThread.main(ActivityThread.java:4998) 04-26 21:42:40.039: E/AndroidRuntime(1125): at java.lang.reflect.Method.invokeNative(Native Method) 04-26 21:42:40.039: E/AndroidRuntime(1125): at java.lang.reflect.Method.invoke(Method.java:515) 04-26 21:42:40.039: E/AndroidRuntime(1125): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777) 04-26 21:42:40.039: E/AndroidRuntime(1125): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593) 04-26 21:42:40.039: E/AndroidRuntime(1125): at dalvik.system.NativeStart.main(Native Method) 04-26 21:42:40.039: E/AndroidRuntime(1125): Caused by: java.lang.NullPointerException 04-26 21:42:40.039: E/AndroidRuntime(1125): at com.example.remotecontrol.RemoteControlFragment.onCreateView(RemoteControlFragment.java:43) 04-26 21:42:40.039: E/AndroidRuntime(1125): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500) 04-26 21:42:40.039: E/AndroidRuntime(1125): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927) 04-26 21:42:40.039: E/AndroidRuntime(1125): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104) 04-26 21:42:40.039: E/AndroidRuntime(1125): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 04-26 21:42:40.039: E/AndroidRuntime(1125): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467) 04-26 21:42:40.039: E/AndroidRuntime(1125): at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:570) 04-26 21:42:40.039: E/AndroidRuntime(1125): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1171) 04-26 21:42:40.039: E/AndroidRuntime(1125): at android.app.Activity.performStart(Activity.java:5253) 04-26 21:42:40.039: E/AndroidRuntime(1125): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2149) 04-26 21:42:40.039: E/AndroidRuntime(1125): ... 11 more
java web java.lang.NullPointerException
严重: Servlet.service() for servlet [selectServlet] in context with path [/Exercise] threw exception java.lang.NullPointerException at DB.DataBaseConnection.selectOperation1(DataBaseConnection.java:45) at Servlet.Select.doPost(Select.java:69) at javax.servlet.http.HttpServlet.service(HttpServlet.java:646) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1074) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:619) 代码: public class DataBaseConnection { static String driverString="com.mysql.jdbc.Driver"; static String urlString="jdbc:mysql://localhost:3306/book"; static String username="root"; static String password="123"; public static Connection getConnection() { Connection connection; try { Class.forName(driverString); } catch (ClassNotFoundException e) { e.printStackTrace(); return null; // TODO: handle exception } try { connection=DriverManager.getConnection(urlString, username, password); } catch (SQLException e) { e.printStackTrace(); return null; // TODO: handle exception } return connection; } public static ResultSet selectOperation1(String Content,String SelectWay) { Connection connection=getConnection(); Statement statement=null; try { statement=connection.createStatement();//这一行报错。。 String sqlString="select * from bookinfo where 1=1"; if(Content!=""&&SelectWay!="") { sqlString+="and"+SelectWay+"='"+Content+"'"; } ResultSet rs=statement.executeQuery(sqlString); return rs; } catch (SQLException e) { e.printStackTrace(); return null; // TODO: handle exception } }
java List做函数参数 出现空指针错误java.lang.NullPointerException,错误的语句如下:
java List做函数参数 出现空指针错误java.lang.NullPointerException,错误的语句如下: boolean result = getVmAllocationPolicySimple().allocateHostForVmList(vmList); 经测试传进去的vmList不为空。
AxisFault 错误 java.lang.NullPointerException
报错行是UserInfo userinfo = (UserInfo) call.invoke(new Object[] {sid,sysno,ip }); ``` AxisFault faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException faultSubcode: faultString: java.lang.NullPointerException faultActor: faultNode: faultDetail: {http://xml.apache.org/axis/}hostname:xiaoming-PC java.lang.NullPointerException at org.apache.axis.message.SOAPFaultBuilder.createFault(SOAPFaultBuilder.java:222) at org.apache.axis.message.SOAPFaultBuilder.endElement(SOAPFaultBuilder.java:129) at org.apache.axis.encoding.DeserializationContext.endElement(DeserializationContext.java:1087) at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source) at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) at javax.xml.parsers.SAXParser.parse(SAXParser.java:395) at org.apache.axis.encoding.DeserializationContext.parse(DeserializationContext.java:227) at org.apache.axis.SOAPPart.getAsSOAPEnvelope(SOAPPart.java:696) at org.apache.axis.Message.getSOAPEnvelope(Message.java:435) at org.apache.axis.handlers.soap.MustUnderstandChecker.invoke(MustUnderstandChecker.java:62) at org.apache.axis.client.AxisClient.invoke(AxisClient.java:206) at org.apache.axis.client.Call.invokeEngine(Call.java:2784) at org.apache.axis.client.Call.invoke(Call.java:2767) at org.apache.axis.client.Call.invoke(Call.java:2443) at org.apache.axis.client.Call.invoke(Call.java:2366) at org.apache.axis.client.Call.invoke(Call.java:1812) at com.asidel.web.webservice.Axis_Client_GetAuths.getAuths(Axis_Client_GetAuths.java:35) at com.asidel.web.controller.IndexController.login(IndexController.java:100) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:100) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:604) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:565) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778) at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:147) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:879) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:600) at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1703) at java.lang.Thread.run(Thread.java:619) ```
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