How to drop a global temporary table?

Hello!

I have a problem with droping a global temporary table from a Java-application.

For performance I temporary store a result from a complex view into a temporary table.

The table is created like:
CREATE GLOBAL TEMPORARY TABLE tbl_names(ids NUMBER(19)) ON COMMIT PRESERVE ROWS

When everything is done I would like to clean up the database, in other words I would like to drop (completely nuke) this table.

First I just tried to drop the table afterwards in the same transaction like:
DROP TABLE tbl_names

But that gave me a ORA-14452: attempt to create, alter or drop an index on a temporary table already in use

I found out that perhaps I should truncate it before.

So I put the code (from Java) like (following illustrates logic):

            connection = DriverManager.getConnection(args[1], args[2], args[3]);
            fillTempTable(connection);
            connection.commit();
         
            connection = DriverManager.getConnection(args[1], args[2], args[3]);
            truncateTempTable(connection);
            connection.commit();
         
            connection = DriverManager.getConnection(args[1], args[2], args[3]);
            dropTempTable(connection);<<<<ERROR
            connection.commit();
         
            connection = DriverManager.getConnection(args[1], args[2], args[3]);
            dropTempView(connection);
            connection.commit();
         
But I still get the same error message.
ORA-14452: attempt to create, alter or drop an index on a temporary table already in use

After each commit I think there should be nothing thats can be said as "already using the table".

So if any one got any input please let me know

Best regards
Fredrik