Index: org/postgresql/jdbc2/AbstractJdbc2Connection.java
===================================================================
RCS file: /cvsroot/jdbc/pgjdbc/org/postgresql/jdbc2/AbstractJdbc2Connection.java,v
retrieving revision 1.52
diff -c -r1.52 AbstractJdbc2Connection.java
*** org/postgresql/jdbc2/AbstractJdbc2Connection.java   1 Jul 2009 05:00:40 -0000       1.52
--- org/postgresql/jdbc2/AbstractJdbc2Connection.java   20 Oct 2009 21:41:35 -0000
***************
*** 684,691 ****
       */
      public void commit() throws SQLException
      {
          if (autoCommit)
!             return ;

          if (protoConnection.getTransactionState() != ProtocolConnection.TRANSACTION_IDLE)
              executeTransactionCommand(commitQuery);
--- 684,696 ----
       */
      public void commit() throws SQLException
      {
+         if (isClosed())
+             throw new PSQLException(GT.tr("Cannot commit when connection is closed."),
+                                     PSQLState.CONNECTION_FAILURE);
+
          if (autoCommit)
!             throw new PSQLException(GT.tr("Cannot commit when autoCommit is enabled."),
!                                     PSQLState.NO_ACTIVE_SQL_TRANSACTION);

          if (protoConnection.getTransactionState() != ProtocolConnection.TRANSACTION_IDLE)
              executeTransactionCommand(commitQuery);
***************
*** 701,708 ****
       */
      public void rollback() throws SQLException
      {
          if (autoCommit)
!             return ;

          if (protoConnection.getTransactionState() != ProtocolConnection.TRANSACTION_IDLE)
              executeTransactionCommand(rollbackQuery);
--- 706,718 ----
       */
      public void rollback() throws SQLException
      {
+         if (isClosed())
+             throw new PSQLException(GT.tr("Cannot rollback when connection is closed."),
+                                     PSQLState.CONNECTION_FAILURE);
+
          if (autoCommit)
!             throw new PSQLException(GT.tr("Cannot rollback when autoCommit is enabled."),
!                                     PSQLState.NO_ACTIVE_SQL_TRANSACTION);

          if (protoConnection.getTransactionState() != ProtocolConnection.TRANSACTION_IDLE)
              executeTransactionCommand(rollbackQuery);