HHH-8898 Change the Session API to enable auto-closeable when running on Java7

hibernate-core/src/main/java/org/hibernate/Session.java

@@ -89,7 +89,7 @@ import org.hibernate.stat.SessionStatistics;
  * @see SessionFactory
  * @author Gavin King
  */
-public interface Session extends SharedSessionContract {
+public interface Session extends SharedSessionContract, java.io.Closeable {
 	/**
 	 * Obtain a {@link Session} builder with the ability to grab certain information from this session.
 	 *
@@ -164,10 +164,9 @@ public interface Session extends SharedSessionContract {
 	 * not strictly necessary to close the session but you must at least
 	 * {@link #disconnect()} it.
 	 *
-	 * @return the connection provided by the application or null.
 	 * @throws HibernateException Indicates problems cleaning up.
 	 */
-	public Connection close() throws HibernateException;
+	public void close() throws HibernateException;
 
 	/**
 	 * Cancel the execution of the current query.

hibernate-core/src/main/java/org/hibernate/engine/spi/SessionDelegatorBaseImpl.java

@@ -473,8 +473,8 @@ public class SessionDelegatorBaseImpl implements SessionImplementor, Session {
 	}
 
 	@Override
-	public Connection close() throws HibernateException {
-		return session.close();
+	public void close() throws HibernateException {
+		session.close();
 	}
 
 	@Override

hibernate-core/src/main/java/org/hibernate/internal/SessionImpl.java

@@ -389,7 +389,7 @@ public final class SessionImpl extends AbstractSessionImpl implements EventSourc
 	}
 
 	@Override
-	public Connection close() throws HibernateException {
+	public void close() throws HibernateException {
 		LOG.trace( "Closing session" );
 		if ( isClosed() ) {
 			throw new SessionException( "Session was already closed" );
@@ -402,7 +402,8 @@ public final class SessionImpl extends AbstractSessionImpl implements EventSourc
 
 		try {
 			if ( !isTransactionCoordinatorShared ) {
-				return jdbcCoordinator.close();
+				jdbcCoordinator.close();
+				return;
 			}
 			else {
 				if ( getActionQueue().hasBeforeTransactionActions() || getActionQueue().hasAfterTransactionActions() ) {
@@ -410,7 +411,7 @@ public final class SessionImpl extends AbstractSessionImpl implements EventSourc
 							"On close, shared Session had before / after transaction actions that have not yet been processed"
 					);
 				}
-				return null;
+				return;
 			}
 		}
 		finally {

hibernate-core/src/test/java/org/hibernate/test/legacy/FooBarTest.java

@@ -4075,7 +4075,7 @@ public class FooBarTest extends LegacyTestCase {
 			throw e;
 		}
 		finally {
-			assertTrue( s.close()==null );
+			s.close();
 		}
 	}
 
@@ -4489,7 +4489,6 @@ public class FooBarTest extends LegacyTestCase {
 		tx = s.beginTransaction();
 		s.createQuery( "from Fo" ).list();
 		tx.commit();
-		assertTrue( s.close() == c );
 		c.close();
 	}