Updating Oracle BLOBs through Tomcat's DBCP

Question

Hi, I've been using Tomcat's DBCP and I'm trying to cast my ResultSet to an OracleResultSet so I can use the getBLOB message. I've searched and realized I had to take part of it out of the wrapper, so I got the connection out of the wrapper using:
con = ds.getConnection().getMetaData().getConnection();which returned an OracleConnection. However, when I work through the rest of the code, it finally gets to:
BLOB filedata = ((OracleResultSet)oRS).getBLOB("filedata");and it dies with:
java.lang.ClassCastException: oracle.jdbc.driver.OracleResultSetImplIf I connect using JDBC without the DBCP datasource, this code works fine. I'm not sure why I can't cast it to something I can use. Can anyone provide some insight on this? I've searched and searched for solutions and tried so many things, but nothing has worked so far aside from just connecting using JDBC.
The ResultSet is not a DelegatingResultSet, which had tripped me up originally. Once I removed the wrapper from the connection, it seemed to give me all the correct types (OracleConnection, OracleStatement, & OracleResultSetImpl), but I can't seem to use the OracleResultSetImpl.
Here's my method:
public static int store(InputStream in) throws SQLException,IOException {
        Connection con = null;
            Context initContext = new InitialContext();
            Context envContext  = (Context)initContext.lookup("java:/comp/env");
            DataSource ds = (DataSource)envContext.lookup("jdbc/develop");
            con = ds.getConnection().getMetaData().getConnection();
        int id = 17;
        String sql = "SELECT file_id,filedata FROM super_files WHERE file_id = "+id+" for update";
        //sql = "SELECT file_id FROM super_files";
        Statement stmt2 = con.createStatement();
        System.out.println("stmt2 class: "+stmt2.getClass());
        ResultSet oRS = stmt2.executeQuery(sql);
        int key = 0;
        if (oRS.next()) {       
/* this next line is where it dies */
            BLOB fileData = ((OracleResultSet)oRS).getBLOB("filedata");
               int bufferSize = fileData.getBufferSize();
                byte buffer[] = new byte[bufferSize];
                OutputStream os = fileData.getBinaryOutputStream();
                int bytesRead = 0;
                while ((bytesRead = in.read(buffer)) != -1) {
                    os.write(buffer, 0, bytesRead);
                in.close();
                os.close();
        oRS.close();
        stmt2.close();       
        con.commit();
        return key;
    }

Answer 1

Hi, I am having the same problem. Were you able to resolve it? Please let me know. I have searched thru the entire WWW but coulnd't find the solution.