运行以下代码......
Session session;
try {
session = sessionFactory.openSession();;
// Query the DB for a list of sms to be sent
Query query = session.createQuery("from Sdnchurch");
list = query.list();
}
catch(Exception e) {
// Manage exception
}
finally {
if (session != null)
session.close();
}
...过了一段时间后，我得到以下异常：
failureorg.hibernate.exception.JDBCConnectionException: could not prepare statement
在我使用客户端的时间超过mySql中配置的WAIT_TIMEOUT时，会开始生成此异常。
这是我在hibernate.cfg.xml中的Hibernate的C3p0配置：
<property name="connection.pool_size">1</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="cache.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">update</property>
<property name="hibernate.c3p0.min_size">50</property>
<property name="hibernate.c3p0.max_size">200</property>
<property name="hibernate.c3p0.acquire_increment">1</property>
<property name="hibernate.c3p0.idle_test_period">3000</property>
<property name="hibernate.c3p0.max_statements">50</property>
<property name="hibernate.c3p0.timeout">7200</property>
<property name="hibernate.c3p0.acquireRetryAttempts">0</property>
<property name="hibernate.c3p0.maxStatementsPerConnection">10</property>
<property name="hibernate.c3p0.numHelperThreads">10</property>
<property name="hibernate.c3p0.idleConnectionTestPeriod">3600</property>
<property name="hibernate.c3p0.preferredTestQuery">select 1</property>
<property name="hibernate.c3p0.testConnectionOnCheckout">true</property>
<property name="hibernate.c3p0.testConnectionOnCheckin">true</property>
如您所见，我也在测试连接。所以我无法真正看出出了什么问题。
我该如何解决这个问题？这是堆栈跟踪：
11:20:59,547 INFO [stdout] (ajp--0.0.0.0-8009-1) Hibernate: select sdnchurc0_.CHURCH_ID as CHURCH1_0_, sdnchurc0_.CHURCH_NAME as CHURCH2_0_ from Msdchurch sdnchurc0_
11:20:59,549 WARN [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (ajp--0.0.0.0-8009-1) SQL Error: 0, SQLState: 08003
11:20:59,549 ERROR [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (ajp--0.0.0.0-8009-1) No operations allowed after connection closed.Connection was implicitly closed by the driver.
11:20:59,549 INFO [uk.co.nisma.sdn.dao.MsdchurchDaoImpl] (ajp--0.0.0.0-8009-1) Rolling back...
11:20:59,549 ERROR [stderr] (ajp--0.0.0.0-8009-1) uk.co.nisma.sdn.exception.MsdwardException: org.hibernate.exception.JDBCConnectionException: could not prepare statement
11:20:59,550 ERROR [stderr] (ajp--0.0.0.0-8009-1) at uk.co.nisma.sdn.dao.MsdchurchDaoImpl.getListHospitals(MsdchurchDaoImpl.java:53)
11:20:59,550 ERROR [stderr] (ajp--0.0.0.0-8009-1) at uk.co.nisma.sdn.WardDetailsImpl.getWardDetails(WardDetailsImpl.java:25)
11:20:59,551 ERROR [stderr] (ajp--0.0.0.0-8009-1) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
11:20:59,551 ERROR [stderr] (ajp--0.0.0.0-8009-1) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
11:20:59,551 ERROR [stderr] (ajp--0.0.0.0-8009-1) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
11:20:59,551 ERROR [stderr] (ajp--0.0.0.0-8009-1) at java.lang.reflect.Method.invoke(Method.java:606)
11:20:59,551 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.jboss.ws.common.invocation.AbstractInvocationHandlerJSE.invoke(AbstractInvocationHandlerJSE.java:111)
11:20:59,552 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.jboss.wsf.stack.cxf.JBossWSInvoker._invokeInternal(JBossWSInvoker.java:181)
11:20:59,552 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.jboss.wsf.stack.cxf.JBossWSInvoker.invoke(JBossWSInvoker.java:127)
11:20:59,552 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:58)
11:20:59,552 ERROR [stderr] (ajp--0.0.0.0-8009-1) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
11:20:59,553 ERROR [stderr] (ajp--0.0.0.0-8009-1) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
11:20:59,553 ERROR [stderr] (ajp--0.0.0.0-8009-1) at java.util.concurrent.FutureTask.run(FutureTask.java:166)
11:20:59,553 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.cxf.workqueue.SynchronousExecutor.execute(SynchronousExecutor.java:37)
11:20:59,553 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:106)
11:20:59,553 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:263)
11:20:59,554 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)
11:20:59,554 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:207)
11:20:59,554 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.jboss.wsf.stack.cxf.RequestHandlerImpl.handleHttpRequest(RequestHandlerImpl.java:91)
11:20:59,554 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.jboss.wsf.stack.cxf.transport.ServletHelper.callRequestHandler(ServletHelper.java:169)
11:20:59,555 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.jboss.wsf.stack.cxf.CXFServletExt.invoke(CXFServletExt.java:87)
11:20:59,555 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:185)
11:20:59,555 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPost(AbstractHTTPServlet.java:108)
11:20:59,555 ERROR [stderr] (ajp--0.0.0.0-8009-1) at javax.servlet.http.HttpServlet.service(HttpServlet.java:754)
11:20:59,556 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.jboss.wsf.stack.cxf.CXFServletExt.service(CXFServletExt.java:135)
11:20:59,556 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.jboss.wsf.spi.deployment.WSFServlet.service(WSFServlet.java:140)
11:20:59,556 ERROR [stderr] (ajp--0.0.0.0-8009-1) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
11:20:59,556 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329)
11:20:59,556 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
11:20:59,557 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)
11:20:59,557 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
11:20:59,557 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153)
11:20:59,557 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)
11:20:59,558 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
11:20:59,558 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
11:20:59,558 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368)
11:20:59,558 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:505)
11:20:59,559 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:445)
11:20:59,559 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930)
11:20:59,559 ERROR [stderr] (ajp--0.0.0.0-8009-1) at java.lang.Thread.run(Thread.java:724)
11:20:59,560 ERROR [stderr] (ajp--0.0.0.0-8009-1) Caused by: org.hibernate.exception.JDBCConnectionException: could not prepare statement
11:20:59,560 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:67)
11:20:59,560 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
11:20:59,560 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
11:20:59,561 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:188)
11:20:59,561 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:159)
11:20:59,561 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1859)
11:20:59,561 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1836)
11:20:59,562 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1816)
11:20:59,562 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.loader.Loader.doQuery(Loader.java:900)
11:20:59,562 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:342)
11:20:59,562 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.loader.Loader.doList(Loader.java:2526)
11:20:59,562 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.loader.Loader.doList(Loader.java:2512)
11:20:59,563 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2342)
11:20:59,563 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.loader.Loader.list(Loader.java:2337)
11:20:59,563 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:495)
11:20:59,563 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:356)
11:20:59,570 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:195)
11:20:59,570 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1269)
11:20:59,570 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
11:20:59,570 ERROR [stderr] (ajp--0.0.0.0-8009-1) at uk.co.nisma.sdn.dao.MsdchurchDaoImpl.getListHospitals(MsdchurchDaoImpl.java:47)
11:20:59,570 ERROR [stderr] (ajp--0.0.0.0-8009-1) ... 39 more
11:20:59,571 ERROR [stderr] (ajp--0.0.0.0-8009-1) Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.Connection was implicitly closed by the driver.
11:20:59,571 ERROR [stderr] (ajp--0.0.0.0-8009-1) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
11:20:59,571 ERROR [stderr] (ajp--0.0.0.0-8009-1) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
11:20:59,572 ERROR [stderr] (ajp--0.0.0.0-8009-1) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
11:20:59,572 ERROR [stderr] (ajp--0.0.0.0-8009-1) at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
11:20:59,572 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
11:20:59,572 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.Util.getInstance(Util.java:381)
11:20:59,573 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:984)
11:20:59,573 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
11:20:59,573 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:926)
11:20:59,573 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.ConnectionImpl.throwConnectionClosedException(ConnectionImpl.java:1160)
11:20:59,573 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.ConnectionImpl.checkClosed(ConnectionImpl.java:1147)
11:20:59,574 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:4224)
11:20:59,574 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:4190)
11:20:59,574 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:161)
11:20:59,574 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:182)
11:20:59,575 ERROR [stderr] (ajp--0.0.0.0-8009-1) ... 55 more
11:20:59,575 ERROR [stderr] (ajp--0.0.0.0-8009-1) Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
11:20:59,575 ERROR [stderr] (ajp--0.0.0.0-8009-1)
11:20:59,575 ERROR [stderr] (ajp--0.0.0.0-8009-1) The last packet successfully received from the server was 70,060 milliseconds ago. The last packet sent successfully to the server was 0 milliseconds ago.
11:20:59,575 ERROR [stderr] (ajp--0.0.0.0-8009-1) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
11:20:59,576 ERROR [stderr] (ajp--0.0.0.0-8009-1) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
11:20:59,576 ERROR [stderr] (ajp--0.0.0.0-8009-1) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
11:20:59,576 ERROR [stderr] (ajp--0.0.0.0-8009-1) at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
11:20:59,576 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
11:20:59,576 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
11:20:59,577 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3052)
11:20:59,577 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2938)
11:20:59,577 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3481)
11:20:59,577 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1959)
11:20:59,577 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2109)
11:20:59,578 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2648)
11:20:59,578 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2077)
11:20:59,578 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2228)
11:20:59,578 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:56)
11:20:59,580 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.loader.Loader.getResultSet(Loader.java:2040)
11:20:59,580 ERROR [stderr] (ajp--0.0.0.0-8009-1) at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1837)
11:20:59,580 ERROR [stderr] (ajp--0.0.0.0-8009-1) ... 52 more
11:20:59,580 ERROR [stderr] (ajp--0.0.0.0-8009-1) Caused by: java.net.SocketException: Software caused connection abort: recv failed
11:20:59,581 ERROR [stderr] (ajp--0.0.0.0-8009-1) at java.net.SocketInputStream.socketRead0(Native Method)
11:20:59,581 ERROR [stderr] (ajp--0.0.0.0-8009-1) at java.net.SocketInputStream.read(SocketInputStream.java:150)
11:20:59,581 ERROR [stderr] (ajp--0.0.0.0-8009-1) at java.net.SocketInputStream.read(SocketInputStream.java:121)
11:20:59,589 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:113)
11:20:59,589 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:160)
11:20:59,589 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:188)
11:20:59,589 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2494)
11:20:59,590 ERROR [stderr] (ajp--0.0.0.0-8009-1) at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2949)
11:20:59,590 ERROR [stderr] (ajp--0.0.0.0-8009-1) ... 62 more