MySQLNonTransientConnectionException：接続が閉じた後、操作は許可されません。接続
私はWebアプリケーションを構築し、ローカルで展開して完璧に機能しました。私はそれをリモートサーバーにデプロイし、：例外を取得し始めました
> javax.servlet.ServletException: could not execute query
org.Apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.Java:518)
org.Apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.Java:421)
>root cause
>org.hibernate.exception.JDBCConnectionException: could not execute query
org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.Java:74)
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.Java:43)
org.hibernate.loader.Loader.doList(Loader.Java:2223)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.Java:2104)
org.hibernate.loader.Loader.list(Loader.Java:2099)
org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.Java:94)
org.hibernate.impl.SessionImpl.list(SessionImpl.Java:1569)
org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.Java:283)
data.dao.UserDAO.findByUsername(UserDAO.Java:42)
action.registration.LoginAction.execute(LoginAction.Java:24)
Sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.Java:39)
Sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.Java:25)
Java.lang.reflect.Method.invoke(Method.Java:597)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.Java:399)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.Java:262)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:224)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.Java:213)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.Java:86)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.Java:150)
org.Apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.Java:48)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.Java:86)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.Java:123)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.intercept(ParametersInterceptor.Java:161)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.Java:105)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
org.Apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.Java:83)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
org.Apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.Java:207)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.Java:74)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.Java:127)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
org.Apache.struts2.interceptor.ProfilingActivationInterceptor.intercept(ProfilingActivationInterceptor.Java:107)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
org.Apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.Java:206)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.Java:115)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.Java:143)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.interceptor.PrepareInterceptor.intercept(PrepareInterceptor.Java:115)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
org.Apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.Java:170)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.Java:123)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.Java:176)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
org.Apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.Java:50)
org.Apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.Java:507)
org.Apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.Java:421)
>root cause
>com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.Connection was implicitly closed due to underlying exception/error:
** BEGIN NESTED EXCEPTION **
>com.mysql.jdbc.exceptions.jdbc4.CommunicationsException
MESSAGE: Communications link failure
>Last packet sent to the server was 43 ms ago.
>STACKTRACE:
>com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
>Last packet sent to the server was 43 ms ago.
at Sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at Sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.Java:39)
at Sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.Java:27)
at Java.lang.reflect.Constructor.newInstance(Constructor.Java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.Java:406)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.Java:1074)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.Java:2985)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.Java:2871)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.Java:3414)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.Java:1936)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.Java:2060)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.Java:2542)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.Java:1734)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.Java:1885)
at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.Java:186)
at org.hibernate.loader.Loader.getResultSet(Loader.Java:1787)
at org.hibernate.loader.Loader.doQuery(Loader.Java:674)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.Java:236)
at org.hibernate.loader.Loader.loadEntity(Loader.Java:1860)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.Java:48)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.Java:42)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.Java:3042)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.Java:395)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.Java:375)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.Java:139)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.Java:195)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.Java:103)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.Java:878)
at org.hibernate.impl.SessionImpl.get(SessionImpl.Java:815)
at org.hibernate.impl.SessionImpl.get(SessionImpl.Java:808)
at data.base._BaseRootDAO.get(_BaseRootDAO.Java:228)
at data.base._BaseRootDAO.get(_BaseRootDAO.Java:217)
at data.base.BaseUserDAO.get(BaseUserDAO.Java:49)
at util.UserUtil.getUser(UserUtil.Java:22)
at action.market.ArmsDealerAction.display(ArmsDealerAction.Java:62)
at action.market.ArmsDealerAction.displayUser(ArmsDealerAction.Java:54)
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 com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.Java:399)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.Java:262)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:224)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.Java:213)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.Java:86)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.Java:150)
at org.Apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.Java:48)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.Java:86)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.Java:123)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.intercept(ParametersInterceptor.Java:161)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.Java:105)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
at org.Apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.Java:83)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
at org.Apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.Java:207)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.Java:74)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.Java:127)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
at org.Apache.struts2.interceptor.ProfilingActivationInterceptor.intercept(ProfilingActivationInterceptor.Java:107)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
at
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.Java:123)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.Java:176)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
org.Apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.Java:188)
at org.Apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.Java:213)
at org.Apache.catalina.core.StandardContextValve.invoke(StandardContextValve.Java:174)
at org.Apache.catalina.core.StandardHostValve.invoke(StandardHostValve.Java:127)
at org.Apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.Java:117)
at org.Apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.Java:108)
at org.Apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.Java:151)
at org.Apache.coyote.http11.Http11Processor.process(Http11Processor.Java:874)
at org.Apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.Java:665)
at org.Apache.Tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.Java:528)
at org.Apache.Tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.Java:81)
at org.Apache.Tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.Java:689)
at Java.lang.Thread.run(Thread.Java:619)
Caused by: Java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.Java:2431)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.Java:2882)
... 141 more
** END NESTED EXCEPTION **
>Sun.reflect.GeneratedConstructorAccessor72.newInstance(Unknown Source)
Sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.Java:27)
Java.lang.reflect.Constructor.newInstance(Constructor.Java:513)
com.mysql.jdbc.Util.handleNewInstance(Util.Java:406)
com.mysql.jdbc.Util.getInstance(Util.Java:381)
com.mysql.jdbc.SQLError.createSQLException(SQLError.Java:984)
com.mysql.jdbc.SQLError.createSQLException(SQLError.Java:956)
com.mysql.jdbc.SQLError.createSQLException(SQLError.Java:926)
com.mysql.jdbc.ConnectionImpl.checkClosed(ConnectionImpl.Java:1098)
com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.Java:4076)
com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.Java:4042)
org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.Java:505)
org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.Java:423)
org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.Java:139)
org.hibernate.loader.Loader.prepareQueryStatement(Loader.Java:1547)
org.hibernate.loader.Loader.doQuery(Loader.Java:673)
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.Java:236)
org.hibernate.loader.Loader.doList(Loader.Java:2220)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.Java:2104)
org.hibernate.loader.Loader.list(Loader.Java:2099)
org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.Java:94)
org.hibernate.impl.SessionImpl.list(SessionImpl.Java:1569)
org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.Java:283)
data.dao.UserDAO.findByUsername(UserDAO.Java:42)
action.registration.LoginAction.execute(LoginAction.Java:24)
Sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.Java:39)
Sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.Java:25)
Java.lang.reflect.Method.invoke(Method.Java:597)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.Java:399)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.Java:262)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:224)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.Java:213)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.Java:86)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.Java:150)
org.Apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.Java:48)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.Java:86)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.Java:123)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.intercept(ParametersInterceptor.Java:161)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.Java:105)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
org.Apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.Java:83)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
org.Apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.Java:207)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.Java:74)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:219)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.Java:218)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.Java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.Java:216)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.Java:127)
私はhibernateとstrutsを使用して、Webアプリケーションを構築し、LinuxサーバーにWebアプリケーションをデプロイしました。そのログイン機能はしばらくの間うまく機能していましたが、その後ログインが機能しなくなり、Tomcatログファイルで上記の例外が表示されました。
エラースタックトレースに従って、MySQLサーバーへの接続が失われます。
>root cause
>com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:
No operations allowed after connection closed.
Connection was implicitly closed due to underlying exception/error:
** BEGIN NESTED EXCEPTION **
>com.mysql.jdbc.exceptions.jdbc4.CommunicationsException
MESSAGE: Communications link failure
>Last packet sent to the server was 43 ms ago.
>STACKTRACE:
>com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
根本的な原因がCommunications link failureであることは明らかです。
データベースサーバーにpingを実行して、接続できるかどうかを確認します。
それ以外の場合は、ネットワークの問題を解決してから接続します。これに代わるものはありません。
軽量pingをデータベースサーバーに発行して、接続の可用性を確認できます。
次のディスカッションと記事をお読みください：
Repositoryクラスに@ Repositoryアノテーションを追加したかどうかを一度だけ確認してください。これも例外の主な理由である可能性があるためです。