mysql - C3P0 连接测试不起作用

标签 mysql hibernate jpa guice c3p0

我正在构建一个使用 JPA、Hibernate 和 C3P0 访问 MySQL 数据库的 Web 应用程序。到目前为止，只要我不超过 MySQL 的 wait_timeout，它就可以正常工作。如果我在触发超时后尝试加载页面，则会收到以下错误，并且必须重新启动应用程序。

javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: could not prepare statement
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1387) ~[hibernate-entitymanager-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1310) ~[hibernate-entitymanager-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:277) ~[hibernate-entitymanager-4.2.7.Final.jar:4.2.7.Final]
at [myApplication].services.ClassroomService.findSessions(ClassroomService.java:155) ~[[myApplication].shared-1.1.6-SNAPSHOT.jar:1.1.6-SNAPSHOT]
at [myApplication].portal.resources.AdminResource.getSessions(AdminResource.java:51) ~[classes/:na]
at sun.reflect.GeneratedMethodAccessor30.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_40]
at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_40]
at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60) [jersey-server-1.17.1.jar:1.17.1]
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185) [jersey-server-1.17.1.jar:1.17.1]
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75) [jersey-server-1.17.1.jar:1.17.1]
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302) [jersey-server-1.17.1.jar:1.17.1]
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) [jersey-server-1.17.1.jar:1.17.1]
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108) [jersey-server-1.17.1.jar:1.17.1]
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) [jersey-server-1.17.1.jar:1.17.1]
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84) [jersey-server-1.17.1.jar:1.17.1]
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1511) [jersey-server-1.17.1.jar:1.17.1]
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1442) [jersey-server-1.17.1.jar:1.17.1]
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1391) [jersey-server-1.17.1.jar:1.17.1]
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1381) [jersey-server-1.17.1.jar:1.17.1]
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416) [jersey-servlet-1.17.1.jar:1.17.1]
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538) [jersey-servlet-1.17.1.jar:1.17.1]
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716) [jersey-servlet-1.17.1.jar:1.17.1]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848) [javax.servlet-3.0.0.v201112011016.jar:na]
at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263) [guice-servlet-3.0.jar:na]
at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:178) [guice-servlet-3.0.jar:na]
at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91) [guice-servlet-3.0.jar:na]
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:62) [guice-servlet-3.0.jar:na]
at [myApplication].web.CorsFilter.doFilter(CorsFilter.java:59) [[myApplication].shared-1.1.6-SNAPSHOT.jar:1.1.6-SNAPSHOT]
at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:163) [guice-servlet-3.0.jar:na]
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58) [guice-servlet-3.0.jar:na]
at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118) [guice-servlet-3.0.jar:na]
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113) [guice-servlet-3.0.jar:na]
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419) [jetty-servlet-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455) [jetty-servlet-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137) [jetty-server-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557) [jetty-security-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231) [jetty-server-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075) [jetty-server-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384) [jetty-servlet-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193) [jetty-server-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009) [jetty-server-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135) [jetty-server-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255) [jetty-server-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154) [jetty-server-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116) [jetty-server-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.server.Server.handle(Server.java:370) [jetty-server-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489) [jetty-server-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:949) [jetty-server-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1011) [jetty-server-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644) [jetty-http-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235) [jetty-http-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82) [jetty-server-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668) [jetty-io-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52) [jetty-io-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608) [jetty-util-8.1.11.v20130520.jar:8.1.11.v20130520]
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543) [jetty-util-8.1.11.v20130520.jar:8.1.11.v20130520]
at java.lang.Thread.run(Thread.java:724) [na:1.7.0_40]
Caused by: org.hibernate.exception.JDBCConnectionException: could not prepare statement
at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:67) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:188) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:159) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1859) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1836) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1816) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.loader.Loader.doQuery(Loader.java:900) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:342) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.loader.Loader.doList(Loader.java:2526) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.loader.Loader.doList(Loader.java:2512) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2342) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.loader.Loader.list(Loader.java:2337) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:495) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:357) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:195) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1275) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:268) ~[hibernate-entitymanager-4.2.7.Final.jar:4.2.7.Final]
... 55 common frames omitted
Caused by: 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 0 ms ago.

STACKTRACE:

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

Last packet sent to the server was 0 ms ago.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
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 com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeQuery(NewProxyPreparedStatement.java:116)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:56)
at org.hibernate.loader.Loader.getResultSet(Loader.java:2040)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1837)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1816)
at org.hibernate.loader.Loader.doQuery(Loader.java:900)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:342)
at org.hibernate.loader.Loader.doList(Loader.java:2526)
at org.hibernate.loader.Loader.doList(Loader.java:2512)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2342)
at org.hibernate.loader.Loader.list(Loader.java:2337)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:495)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:357)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:195)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1275)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:268)
at [myApplication].services.ClassroomService.findSessions(ClassroomService.java:155)
at [myApplication].portal.resources.AdminResource.getSessions(AdminResource.java:51)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1511)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1442)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1391)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1381)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263)
at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:178)
at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:62)
at [myApplication].web.CorsFilter.doFilter(CorsFilter.java:59)
at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:163)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58)
at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:370)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:949)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1011)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Thread.java:724)
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)
... 80 more


** END NESTED EXCEPTION **


at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.7.0_40]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) ~[na:1.7.0_40]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.7.0_40]
at java.lang.reflect.Constructor.newInstance(Constructor.java:526) ~[na:1.7.0_40]
at com.mysql.jdbc.Util.handleNewInstance(Util.java:406) ~[mysql-connector-java-5.1.6.jar:na]
at com.mysql.jdbc.Util.getInstance(Util.java:381) ~[mysql-connector-java-5.1.6.jar:na]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:984) ~[mysql-connector-java-5.1.6.jar:na]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956) ~[mysql-connector-java-5.1.6.jar:na]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:926) ~[mysql-connector-java-5.1.6.jar:na]
at com.mysql.jdbc.ConnectionImpl.checkClosed(ConnectionImpl.java:1098) ~[mysql-connector-java-5.1.6.jar:na]
at com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:4076) ~[mysql-connector-java-5.1.6.jar:na]
at com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:4042) ~[mysql-connector-java-5.1.6.jar:na]
at com.mchange.v2.c3p0.impl.NewProxyConnection.prepareStatement(NewProxyConnection.java:162) ~[c3p0-0.9.2.1.jar:0.9.2.1]
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:161) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:182) ~[hibernate-core-4.2.7.Final.jar:4.2.7.Final]
... 71 common frames omitted
Nov 26, 2013 11:40:43 AM com.sun.jersey.spi.container.ContainerResponse logException
SEVERE: Mapped exception to response: 500 (Internal Server Error)
[myApplication].api.ResourceException
at [myApplication].portal.resources.AdminResource.getSessions(AdminResource.java:68)
at sun.reflect.GeneratedMethodAccessor30.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1511)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1442)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1391)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1381)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263)
at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:178)
at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:62)
at [myApplication].web.CorsFilter.doFilter(CorsFilter.java:59)
at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:163)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58)
at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:370)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:949)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1011)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Thread.java:724)

我有时还会收到JDBCConnectionException:无法提取ResultSet，但这源于相同的通信链接故障。

通常，C3P0可以配置为在使用前测试连接是否有效，我尝试实现它，但似乎不起作用。我也在使用 Guice，当我使用 @Inject 获取 EntityManager 时，我认为有些事情变得很糟糕。

有人知道这是怎么回事吗？我已经浏览了几乎所有可能有帮助的内容，但我还没有找到任何东西。我准备尝试切换到 Apache DBCP，看看效果是否更好。

谢谢，
泰勒

PS:这是我的 persistence.xml 和 c3p0-config.xml，以防有帮助。

persistence.xml

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
    version="2.0">
    <persistence-unit name="wam" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>myApplication.beans.AnswerBean</class>
        <class>myApplication.beans.ConfigBean</class>
        <class>myApplication.beans.CourseBean</class>
        <class>myApplication.beans.DealerBean</class>
        <class>myApplication.beans.LocationBean</class>
        <class>myApplication.beans.TrainerBean</class>
        <class>myApplication.beans.PositionBean</class>
        <class>myApplication.beans.QuestionBean</class>
        <class>myApplication.beans.SessionBean</class>
        <class>myApplication.beans.StudentBean</class>
        <!-- See '/etc/setup.txt' for how to setup using MS-SQL * Change driver/dialect
            (H2=H2Dialect / MSSQL=SQLServerDialect) * Change url below (jdbc.url)
            * Change
            user/password (jdbc.user and password) OPTIONAL: * Create Database first
            (ie maildb) * Change hbm2ddl -->
        <exclude-unlisted-classes>true</exclude-unlisted-classes>
        <shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode>
        <properties>
            <property name="javax.persistence.jdbc.driver" value="${portal.db.driver}" />
            <property name="javax.persistence.jdbc.url" value="${portal.db.url}" />
            <property name="javax.persistence.jdbc.user" value="${portal.db.user}" />
            <property name="javax.persistence.jdbc.password" value="${portal.db.pass}" />
            <property name="hibernate.dialect" value="${portal.db.dialect}" />
            <property name="hibernate.show_sql" value="false" />
            <property name="hibernate.connection.shutdown" value="true" />
            <property name="hibernate.generate_statistics" value="${stats}"/>
            <property name="hibernate.hbm2ddl.auto" value="${portal.db.schema}" />
            <!-- Caching -->
            <property name="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory"/>
            <property name="net.sf.ehcache.configurationResourceName" value="ehcache.xml" />
            <property name="hibernate.cache.use_query_cache" value="true" />
            <property name="hibernate.cache.use_second_level_cache" value="true" />
            <!-- Pooling -->
            <property name="hibernate.connection.provider_class" value="org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider" />
        </properties>
    </persistence-unit>
</persistence>

c3p0-config.xml

<c3p0-config>
    <default-config>
        <property name="acquireIncrement">3</property>
        <property name="idleConnectionTestPeriod">9</property>
        <property name="maxConnectionAge">30</property>
        <property name="maxIdleTime">10</property>
        <property name="maxPoolSize">25</property>
        <property name="maxStatements">0</property>
        <property name="minPoolSize">5</property>
        <property name="preferredTestQuery">SELECT 1</property>
        <property name="testConnectionOnCheckin">true</property>
    </default-config>
</c3p0-config>

最佳答案

1) 验证您想要的配置实际上是正在使用的配置。 c3p0 池在初始化时转储其配置以记录在 INFO 中。或者，您可以通过 JMX 检查。如果 Guice 以编程方式覆盖您在配置中设置的默认值，您应该在转储的配置中看到这一点。

2)您如何管理 hibernate session ？您是立即关闭它们，还是重用长期存在的 session 。如果是后者，则不要。当使用连接池时， session 应该执行一个工作单元，该工作单元定义为客户端无需等待进一步交互即可执行的全套操作。一旦该工作完成， session 应立即 close()ed。保持长期开放的 session 是一种可怕但不幸的是常见的做法；它违背了连接池的目的及其确保的能力，例如在这种情况下，就是活跃度。

附:您正在设置 testConnectionOnCheckout 和 testConnectionOnCheckin。这可能有点过头了 testConnectionOnCheckout 已经足够、简单且可靠，但会在客户的代码路径中收取性能税。为了避免这种税收(以牺牲一点可靠性为代价，请将 testConnectionOnCheckin 与 idleConnectionTestPeriod 结合起来。请参阅 http://www.mchange.com/projects/c3p0/#configuring_connection_testing

关于mysql - C3P0 连接测试不起作用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20224048/

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