Hi sathishts,
Please provide details about your environment (WAS version, SO,...) and if you can put the complet error or SystemOut.log
Your problem is related to the Datasource implementation class. In your configured driver is not com.ibm.db2.jcc.DB2ConnectionPoolDataSource class.
Please check in you driver configuration if you are reaching the file (jar file). Normally if you configure the driver using wizard WebSphere variables are used, so you need to check this WebSphere Variables a pointing to some path in your system.
after verify that you are reaching the file, then check that the class exists in your driver.
Hope this helps. Tell us if you need more support.
Regards