HHH-6792 connection leaks due to service registry is not destroyed

hibernate-core/src/main/java/org/hibernate/engine/jdbc/internal/JdbcServicesImpl.java

@@ -229,7 +229,7 @@ public class JdbcServicesImpl implements JdbcServices, ServiceRegistryAwareServi
 
 		@Override
 		public void releaseConnection(Connection connection) throws SQLException {
-			connection.close();
+			connectionProvider.closeConnection( connection );
 		}
 	}
 
@@ -247,7 +247,7 @@ public class JdbcServicesImpl implements JdbcServices, ServiceRegistryAwareServi
 
 		@Override
 		public void releaseConnection(Connection connection) throws SQLException {
-			connection.close();
+			connectionProvider.releaseAnyConnection( connection );
 		}
 	}
 

hibernate-core/src/main/java/org/hibernate/service/internal/AbstractServiceRegistryImpl.java

@@ -252,7 +252,7 @@ public abstract class AbstractServiceRegistryImpl implements ServiceRegistryImpl
 			);
 		}
 	}
-
+    @Override
 	public void destroy() {
 		ListIterator<Service> serviceIterator = serviceList.listIterator( serviceList.size() );
 		while ( serviceIterator.hasPrevious() ) {

hibernate-testing/src/main/java/org/hibernate/testing/junit4/BaseCoreFunctionalTestCase.java

@@ -365,6 +365,11 @@ public abstract class BaseCoreFunctionalTestCase extends BaseUnitTestCase {
 		sessionFactory.close();
 		sessionFactory = null;
 		configuration = null;
+        if(serviceRegistry == null){
+            return;
+        }
+        serviceRegistry.destroy();
+        serviceRegistry=null;
 	}
 
 	@OnFailure