Handling Character large objects in Java application

In my Java application, I have a stream of character data in a java.io.Reader object.
I am using a PreparedStatement object to insert data into a table containing such a large object column (datatype - text). I am using the following API call:
PreparedStatement.setCharacterStream(colIndex, reader, size);

In order to find the size in the above statement, I read the stream and find the length.
Because of this I am getting the following error message and the data is not getting inserted:

Exception during insertion : Failed for MYTABLE Reason [Microsoft][SQLServer 2000 Driver for JDBC]Transliteration failed.

Is there any alternate method to handle this? Please help.Are you executing the statement within a loop? If that's the case, - see if this will help:

http://knowledgebase2.datadirect.com/kbase.nsf/SupportLink+Online/2471321MF?OpenDocument