java ORA-22920: row containing the LOB value is not locked

I've seen many posts about this Oracle error w/ clobs. The code below contains the "FOR UPDATE" though, and I still get this error (on occasion)

java full version "1.3.0"
Oracle8i Enterprise Edition Release 8.1.7.0.0 - Production classes12.zip

I get the Oracle exception on the flush() command. Should I not be doing this?

Thanks for any insight.

con.setAutoCommit(false);
stmt = con.prepareCall("SELECT t1.clob_data FROM t_clob t1,t_users t2 WHERE t1.clob_id = t2.ssi_config AND t2.userid = ? FOR UPDATE"); stmt.setInt(1,i_user_id);
stmt.execute();

ResultSet myclobrs = stmt.getResultSet(); myclobrs.next();
oracle.sql.CLOB new_perm_clob = (oracle.sql.CLOB)myclobrs.getClob(1); java.io.OutputStream permission_stream = new_perm_clob.getAsciiOutputStream();

permission_stream.write(new_perms_wr.toString().getBytes()); permission_stream.flush();
if (stmt != null) stmt.close();
if (myclobrs != null) myclobrs.close();
con.commit();
con.setAutoCommit(true); Received on Wed May 07 2003 - 08:21:33 CDT