Help on using CLOB with MS SQL Server

[Hanmin_Wang]

I am trying to access a blob or clob field on SQL Server 2000 using OJB. I 
got the exception like:

java.sql.SQLException: [Microsoft][SQLServer 2000 Driver for 
JDBC]Unsupported data conversion.
        at com.microsoft.jdbc.base.BaseExceptions.createException(Unknown 
Source)
        at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown 
Source)
        at com.microsoft.jdbc.base.BaseData.unsupportedConversion(Unknown 
Source)
        at com.microsoft.jdbc.base.BaseData.getBlob(Unknown Source)
        at com.microsoft.jdbc.base.BaseResultSet.getBlob(Unknown Source)
        at com.microsoft.jdbc.base.BaseResultSet.getBlob(Unknown Source)
.....

I am using the driver from microsoft company. the driver is 
com.microsoft.jdbc.sqlserver.SQLServerDriver.
 Has anyone has any idea? 
Thanks a lot,
John