hi,
1. Add the path to "classes12.zip" (/weblogic/ext/jdbc/classes12.zip) in your WEBLOGICCLASSPATH
2. Add this to your weblogic.properties file
weblogic.jdbc.connectionPool.my_pool_name=\
url=jdbc
racle:thin:@my_oracle_server:1521:my_oracle_alias,\
driver=oracle.jdbc.driver.OracleDriver,\
initialCapacity=5,\
maxCapacity=10,\
capacityIncrement=2,\
props=user=my_oracle_user;password=my_oracle_password
weblogic.allow.reserve.weblogic.jdbc.connectionPool.my_pool_name=everyone
weblogic.jdbc.TXDataSource.jdbc.my_pool_name=my_pool_name
3. Restart your weblogic.
Hope it will help you.