Spring, MySQL and Hibernate: Database error if the system is not used within 8 hours
Solution 1
Use c3p0 for pool, it is used ready for production use
Use this parameter(you can modify to optimize), that will retain your connection active
<property name="hibernate.c3p0.timeout">1800</property>
<property name="hibernate.c3p0.idle_test_period">100</property>
EDIT You can also increase 8 hour limit by below parameter
http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html#sysvar_wait_timeout
Solution 2
This happens because mysql drops connection after 8 hours. One way to fix this is to use c3p0
as mentioned in other posts. Another way is to use mysql's autoReconnect=true
property in the jdbc url. This property will attempt to reconnect when the next query is issued on the connection.
More here: http://dev.mysql.com/doc/refman/5.0/en/connector-j-reference-configuration-properties.html
Note that autoReconnect
will only handle the connection part. It will not re execute the query automatically. You will have to deal with that yourself by catching SQLException
and retrying the query in your code. I recently ran into this and it worked for me.
PartyWithJohn
Updated on June 20, 2022Comments
-
PartyWithJohn almost 2 years
I am working on a Spring, MySQL and Hibernate project and If the project is not used within 8 hours I get the following error. Can someone please tell me why. It looks like if I reboot the server everything works great until night time or if no one is using the system mid day for a few hours. can someone please help me out I just found this issue in a few of my projects so I must be making the same mistake in a number of projects.. please help
Here is a example of my java code am I missing something:
public void saveVisit(VisitModel visit) throws Exception { LOGGER.debug("[" + visit.toString() + "]"); sessionFactory.getCurrentSession().saveOrUpdate(visit); } @SuppressWarnings("unchecked") public School_lookupModel getSchoolInformation(String schoolCode) { return (School_lookupModel) sessionFactory.getCurrentSession() .createCriteria(School_lookupModel.class) .add( Restrictions.like("school", schoolCode)) .uniqueResult(); }
Here is the console output of the errors:
2012-09-06 08:00:07,088 [http-8080-2] WARN org.hibernate.util.JDBCExceptionReporter - SQL Error: 0, SQLState: 08S01 2012-09-06 08:00:07,088 [http-8080-2] ERROR org.hibernate.util.JDBCExceptionReporter - Communications link failure due to underlying exception: ** BEGIN NESTED EXCEPTION ** java.io.EOFException STACKTRACE: java.io.EOFException at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1963) at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2375) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2874) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1623) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1715) at com.mysql.jdbc.Connection.execSQL(Connection.java:3249) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1268) at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1403) at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:93) at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:208) at org.hibernate.loader.Loader.getResultSet(Loader.java:1849) at org.hibernate.loader.Loader.doQuery(Loader.java:718) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:270) at org.hibernate.loader.Loader.doList(Loader.java:2294) at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2172) at org.hibernate.loader.Loader.list(Loader.java:2167) at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:119) at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1706) at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:347) at org.uftwf.schoolvisit.dao.SchoolVisitDAOImpl.getSelectableReporters(SchoolVisitDAOImpl.java:56) at org.uftwf.schoolvisit.service.SchoolVisitServiceImpl.getSelectableReporters(SchoolVisitServiceImpl.java:130) 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:616) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) at $Proxy36.getSelectableReporters(Unknown Source) at org.uftwf.schoolvisit.controller.swf.FlowActions.initializeSelectableReports(FlowActions.java:57) 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:616) at org.springframework.expression.spel.support.ReflectiveMethodExecutor.execute(ReflectiveMethodExecutor.java:69) at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:84) at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:57) at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:102) at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:97) at org.springframework.binding.expression.spel.SpringELExpression.getValue(SpringELExpression.java:84) at org.springframework.webflow.action.EvaluateAction.doExecute(EvaluateAction.java:75) at org.springframework.webflow.action.AbstractAction.execute(AbstractAction.java:188) at org.springframework.webflow.execution.AnnotatedAction.execute(AnnotatedAction.java:145) at org.springframework.webflow.execution.ActionExecutor.execute(ActionExecutor.java:51) at org.springframework.webflow.engine.ActionList.execute(ActionList.java:155) at org.springframework.webflow.engine.Flow.start(Flow.java:534) at org.springframework.webflow.engine.impl.FlowExecutionImpl.start(FlowExecutionImpl.java:366) at org.springframework.webflow.engine.impl.FlowExecutionImpl.start(FlowExecutionImpl.java:222) at org.springframework.webflow.executor.FlowExecutorImpl.launchExecution(FlowExecutorImpl.java:140) at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:193) 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.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:102) 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.Http11Processor.process(Http11Processor.java:859) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:679) ** END NESTED EXCEPTION ** Last packet sent to the server was 13 ms ago. 2012-09-06 08:00:07,089 [http-8080-2] WARN org.hibernate.util.JDBCExceptionReporter - SQL Error: 0, SQLState: null 2012-09-06 08:00:07,089 [http-8080-2] ERROR org.hibernate.util.JDBCExceptionReporter - Already closed. 2012-09-06 08:00:07,089 [http-8080-2] WARN org.hibernate.util.JDBCExceptionReporter - SQL Error: 0, SQLState: null 2012-09-06 08:00:07,089 [http-8080-2] ERROR org.hibernate.util.JDBCExceptionReporter - Already closed. Sep 6, 2012 8:00:07 AM org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Servlet.service() for servlet spring threw exception com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: ** BEGIN NESTED EXCEPTION ** java.io.EOFException STACKTRACE: java.io.EOFException at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1963) at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2375) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2874) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1623) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1715) at com.mysql.jdbc.Connection.execSQL(Connection.java:3249) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1268) at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1403) at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:93) at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:208) at org.hibernate.loader.Loader.getResultSet(Loader.java:1849) at org.hibernate.loader.Loader.doQuery(Loader.java:718) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:270) at org.hibernate.loader.Loader.doList(Loader.java:2294) at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2172) at org.hibernate.loader.Loader.list(Loader.java:2167) at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:119) at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1706) at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:347) at org.uftwf.schoolvisit.dao.SchoolVisitDAOImpl.getSelectableReporters(SchoolVisitDAOImpl.java:56) at org.uftwf.schoolvisit.service.SchoolVisitServiceImpl.getSelectableReporters(SchoolVisitServiceImpl.java:130) 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:616) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) at $Proxy36.getSelectableReporters(Unknown Source) at org.uftwf.schoolvisit.controller.swf.FlowActions.initializeSelectableReports(FlowActions.java:57) 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:616) at org.springframework.expression.spel.support.ReflectiveMethodExecutor.execute(ReflectiveMethodExecutor.java:69) at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:84) at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:57) at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:102) at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:97) at org.springframework.binding.expression.spel.SpringELExpression.getValue(SpringELExpression.java:84) at org.springframework.webflow.action.EvaluateAction.doExecute(EvaluateAction.java:75) at org.springframework.webflow.action.AbstractAction.execute(AbstractAction.java:188) at org.springframework.webflow.execution.AnnotatedAction.execute(AnnotatedAction.java:145) at org.springframework.webflow.execution.ActionExecutor.execute(ActionExecutor.java:51) at org.springframework.webflow.engine.ActionList.execute(ActionList.java:155) at org.springframework.webflow.engine.Flow.start(Flow.java:534) at org.springframework.webflow.engine.impl.FlowExecutionImpl.start(FlowExecutionImpl.java:366) at org.springframework.webflow.engine.impl.FlowExecutionImpl.start(FlowExecutionImpl.java:222) at org.springframework.webflow.executor.FlowExecutorImpl.launchExecution(FlowExecutorImpl.java:140) at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:193) 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.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:102) 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.Http11Processor.process(Http11Processor.java:859) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:679) ** END NESTED EXCEPTION ** Last packet sent to the server was 13 ms ago. at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2586) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2874) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1623) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1715) at com.mysql.jdbc.Connection.execSQL(Connection.java:3249) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1268) at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1403) at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:93) at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:208) at org.hibernate.loader.Loader.getResultSet(Loader.java:1849) at org.hibernate.loader.Loader.doQuery(Loader.java:718) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:270) at org.hibernate.loader.Loader.doList(Loader.java:2294) at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2172) at org.hibernate.loader.Loader.list(Loader.java:2167) at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:119) at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1706) at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:347) at org.uftwf.schoolvisit.dao.SchoolVisitDAOImpl.getSelectableReporters(SchoolVisitDAOImpl.java:56) at org.uftwf.schoolvisit.service.SchoolVisitServiceImpl.getSelectableReporters(SchoolVisitServiceImpl.java:130) 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:616) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) at $Proxy36.getSelectableReporters(Unknown Source) at org.uftwf.schoolvisit.controller.swf.FlowActions.initializeSelectableReports(FlowActions.java:57) 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:616) at org.springframework.expression.spel.support.ReflectiveMethodExecutor.execute(ReflectiveMethodExecutor.java:69) at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:84) at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:57) at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:102) at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:97) at org.springframework.binding.expression.spel.SpringELExpression.getValue(SpringELExpression.java:84) at org.springframework.webflow.action.EvaluateAction.doExecute(EvaluateAction.java:75) at org.springframework.webflow.action.AbstractAction.execute(AbstractAction.java:188) at org.springframework.webflow.execution.AnnotatedAction.execute(AnnotatedAction.java:145) at org.springframework.webflow.execution.ActionExecutor.execute(ActionExecutor.java:51) at org.springframework.webflow.engine.ActionList.execute(ActionList.java:155) at org.springframework.webflow.engine.Flow.start(Flow.java:534) at org.springframework.webflow.engine.impl.FlowExecutionImpl.start(FlowExecutionImpl.java:366) at org.springframework.webflow.engine.impl.FlowExecutionImpl.start(FlowExecutionImpl.java:222) at org.springframework.webflow.executor.FlowExecutorImpl.launchExecution(FlowExecutorImpl.java:140) at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:193) 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.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:102) 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.Http11Processor.process(Http11Processor.java:859) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:679)
-
eis over 11 yearswhy? there are lot of connection pool implementations. why that? does it help with the problem?
-
Nirmal- thInk beYond over 11 yearsyes, by default mysql will close connection after 8
hour,hibernate.c3p0.idle_test_period
will it keep open, and there are many keys that can improve performance, it is best with hibernate and mysql -
eis over 11 yearsSince you can fix this with both mysql conf and tomcat conf, I don't see why user should add a different connection pool.
-
PartyWithJohn over 11 yearsMatei I added my java code can you please review it and let me know if I am not doing something right and how to fix it
-
PartyWithJohn over 11 yearsNirmal-think I installed c3p0 today into my project and I will see how it goes tomorrow..
-
PartyWithJohn over 11 yearsNirmal I dont think its going to work.. it does not look like its using the setttings :(
-
Nirmal- thInk beYond over 11 yearshave you used connection provider class:
<property name="hibernate.connection.provider_class"> org.hibernate.connection.C3P0ConnectionProvider </property>
? -
Matei Florescu over 11 years
sessionFactory.getCurrentSession()
gives you the session, you must make sure that the session gets properly closed. In the code you posted the session does not get closed, however this is not necessarily a problem, since it could be closed elsewhere is your app. Even more, Spring can be configured to take care of opening/closing a session (google for "open session in view spring" to find out more). -
Matei Florescu over 11 yearsOne last thing: if you use Spring, you might want to take a look at the HibernateTemplate: link, for example.
-
ronit almost 3 yearsthis ssems helpful,, but can you tell me that after using c3p0 sql wont terminate the connection despite if it doesn't receive any request from client.
-
ronit almost 3 years@nirmal, can you help here....i have this c3p0 config....but still my sql throws this error,....randomly ..... what does this config do ? idle_test_period