Tomcat 4.1 Oracle Blob problem using apache commons DBCP

Question

Hi all,
We are using Tomcat 4.1.12, Java 1.4.x and trying to take advantage of the connection pooling that comes with Tomcat(the apache commons DBCP).
We are connecting to a oracle database.
Works fine for everything EXCEPT Blobs. We have a servlet that serves images from Oracle, that works fine when it doesn't use the connection pooling, but throws an exception when we call the
ERROR: Class:DisplayGraphic Method:processRequest(HttpServletRequest request, Ht
tpServletResponse response)
Exception: org.apache.commons.dbcp.DelegatingResultSet
DataSource ds = (DataSource)ctx.lookup("jdbc/db_connection");
Connection conn = ds.getConnection();
PreparedStatement pstmt = null;
ResultSet rs = null;
pstmt = conn.prepareStatement("SELECT graphic FROM graphics WHERE graphic_id = 1");
rs = pstmt.executeQuery();
if(rs.next())
    oracle.sql.BLOB oBlob = ((OracleResultSet) oRS).getBLOB("GRAPHIC");
    InputStream oIS =  oBlob.getBinaryStream();
    ... etc etc...
}Any ideas?
Cheers,
Alex.

Answer 1

solved the problem.. i was using getBLOB instead of
getBlob
doh..Hi Alex,
your problem is very interesting for me because I have a similar problem and your identical configuration...
the instruction
oracle.slq.BLOB aBlob = ((OracleResultSet)super.mRs).getBLOB("BLOBBONE")
causes this:
java.lang.ClassCastException: org.apache.commons.dbcp.DelegatingResultSet
To resolve this, I changed, in server.xml , the factory
<parameter>
                    <name>factory</name>
                    <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
               </parameter>
with:
<parameter>
<name>factory</name>
<value>oracle.jdbc.pool.OracleDataSourceFactory</value>
</parameter>          
and magically all works fine...
But the question is... Why doesn't it work with the standard factory???
There is a problem in the CLASSPATH that I don't see?
Any suggestions is welcome!
Thanks in advance!
Giselda