Connection is not associated with a managed connection.org.jboss.resource.adapter.jdbc.jdk6.WrappedConnectionJDK6

I am using Hibernate on a JBoss server. I get the error below.

The error happens when I try to connect to the database for the second time in the same sesssion.

Also I get the error "Closing connection for you. Please close your connection".

    14:28:37,869 ERROR [HibernateUtil] HibernateException  occurred in executeQuery  method   in  HibernateUtil class 
    org.hibernate.exception.GenericJDBCException: could not execute query
    at   org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:126)
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:114)
    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
    at org.hibernate.loader.Loader.doList(Loader.java:2231)
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
    at org.hibernate.loader.Loader.list(Loader.java:2120)
    at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)
    at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)
    at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
    at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)
    at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
    at com.a.amc.dao.utils.HibernateUtil.executeQuery(HibernateUtil.java:154)
    at com.a.amc.service.impl.CityServiceImpl.isCityExists(CityServiceImpl.java:142)
    at com.a.amc.service.impl.CityServiceImpl.addCity(CityServiceImpl.java:38)
    at com.a.amc.web.actions.CityAction.addCity(CityAction.java:50)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)

14:28:37,869 ERROR [JDBCTransaction] Could not toggle autocommit
java.sql.SQLException: Connection is not associated with a managed connection.org.jboss.resource.adapter.jdbc.jdk6.WrappedConnectionJDK6@1269ca1
    at org.jboss.resource.adapter.jdbc.WrappedConnection.lock(WrappedConnection.java:81)
    at org.jboss.resource.adapter.jdbc.WrappedConnection.setAutoCommit(WrappedConnection.java:454)
    at org.hibernate.transaction.JDBCTransaction.toggleAutoCommit(JDBCTransaction.java:228)
    at org.hibernate.transaction.JDBCTransaction.rollbackAndResetAutoCommit(JDBCTransaction.java:220)
    at org.hibernate.transaction.JDBCTransaction.rollback(JDBCTransaction.java:196)
    at com.a.amc.dao.utils.HibernateUtil.executeQuery(HibernateUtil.java:159)
    at com.a.amc.service.impl.CityServiceImpl.isCityExists(CityServiceImpl.java:142)
    at com.a.amc.service.impl.CityServiceImpl.addCity(CityServiceImpl.java:38)
    at com.a.amc.web.actions.CityAction.addCity(CityAction.java:50)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)

14:28:37,869 ERROR [JDBCTransaction] JDBC rollback failed
java.sql.SQLException: Connection is not associated with a managed connection.org.jboss.resource.adapter.jdbc.jdk6.WrappedConnectionJDK6@1269ca1
    at org.jboss.resource.adapter.jdbc.WrappedConnection.lock(WrappedConnection.java:81)
    at org.jboss.resource.adapter.jdbc.WrappedConnection.rollback(WrappedConnection.java:496)
    at org.hibernate.transaction.JDBCTransaction.rollbackAndResetAutoCommit(JDBCTransaction.java:217)
    at org.hibernate.transaction.JDBCTransaction.rollback(JDBCTransaction.java:196)
    at com.a.amc.dao.utils.HibernateUtil.executeQuery(HibernateUtil.java:159)
    at com.a.amc.service.impl.CityServiceImpl.isCityExists(CityServiceImpl.java:142)
    at com.a.amc.service.impl.CityServiceImpl.addCity(CityServiceImpl.java:38)
    at com.a.amc.web.actions.CityAction.addCity(CityAction.java:50)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)

14:28:37,869 ERROR [CityServiceImpl] Exception  occurred in isCityExists method in  CityServiceImpl
org.hibernate.TransactionException: JDBC rollback failed
    at org.hibernate.transaction.JDBCTransaction.rollback(JDBCTransaction.java:204)
    at com.a.amc.dao.utils.HibernateUtil.executeQuery(HibernateUtil.java:159)
    at com.a.amc.service.impl.CityServiceImpl.isCityExists(CityServiceImpl.java:142)
    at com.a.amc.service.impl.CityServiceImpl.addCity(CityServiceImpl.java:38)
    at com.a.amc.web.actions.CityAction.addCity(CityAction.java:50)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)

What could be the cause, and how do I solve this situation?

This answer may actually too late since you asked this a year ago. but it will help those who will encounter this error in the future.

Your error may came from different source, but in my case its all about the transaction timeout, some of the query may take long so the timeout is reach and hibernate throws an exception. In my case what i did was set the transaction timeout to much higher value. Which solves my problem.

Here is a useful link. The transaction is not active!

Understanding JDBC internal timeouts config

-cheers