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I face the following error, i use the oracle jdbc driver as db driver and i use the same ojdbc14.jar file as the project library, but when i try to cast the clob object return from resutlset it throw me class cast exception, i did print out the class name it shown oracle.sql.CLOB, but when i cast the object to oracle.sql.CLOB it still show me the error.

Do you have any idea what is wrong?

====================// java code

import java.sql.Clob;

import oracle.sql.CLOB;

Clob clob = null;

if ( )


clob = resultSet.getClob( 1 );

logger.debug( "resultSet.getClass() is " + resultSet.getClass() );

logger.debug( "clob.getClass() is " + clob.getClass() );

logger.debug( "clob is " + clob );

logger.debug( "(clob instanceof oracle.sql.CLOB) is " + (clob instanceof oracle.sql.CLOB));

CLOB oraClob = (CLOB)clob; // this is where the class cast exception occur

====================// log file

[10/01/2005 15:51:26] b.crrs.common.CRRSParamServlet -- DEBUG -- selectUpdateStatement is

[10/01/2005 15:51:26] b.crrs.common.CRRSParamServlet -- DEBUG -- resultSet.getClass() is class oracle.jdbc.driver.OracleResultSetImpl

[10/01/2005 15:51:26] b.crrs.common.CRRSParamServlet -- DEBUG -- clob.getClass() is class oracle.sql.CLOB

[10/01/2005 15:51:26] b.crrs.common.CRRSParamServlet -- DEBUG -- clob is oracle.sql.CLOB@1a21321

[10/01/2005 15:51:26] b.crrs.common.CRRSParamServlet -- DEBUG -- (clob instanceof oracle.sql.CLOB) is false

[10/01/2005 15:51:26] b.crrs.common.CRRSParamServlet -- DEBUG -- error


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  • Posted on Jan 11, 2005 at 01:52 PM
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