Connection leaks using legacy (non-JPA) Hibernate interface with JBoss managed JTA datasource pool in JBoss EAP 7

Issue

• Configured hibernate.cfg.xml using the following properties

      <property name="hibernate.connection.datasource">java:jboss/datasources/MyDS</property> <!-- jta="true" -->
      ...
      <property name="connection.autocommit">true</property>
  

• Observed IJ000453 / IJ000655 errors

• After enabling the cached connection manager debug facility, messages like the following are found in the server.log

  ... IJ000100: Closing a connection for you. Please close them yourself: org.jboss.jca.adapters.jdbc.jdk8.WrappedConnectionJDK8...
      at org.jboss.jca.core.connectionmanager.ccm.CachedConnectionManagerImpl.registerConnection(CachedConnectionManagerImpl.java:308)
      ...
      at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:139)
      ...
      at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:162)
      at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1471)