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1. When you created this DataSource and gave Connection Pool details from Weblogic Admin Console, what Drivers did you select. You can find this from your domain/config/jdbc/xxx.xml file where xxx kind of refers to the datasource file. This has all .xml file for each datasource. Please send me this file here.
2. Try to use normal Oracle out of box Service Level Non-XA Drivers and see if that helps.
3. Also make sure you have the Remote JDBC flag enabled in your setDomainEnv file. Most probably this may not be issue looking at your error. But please do set this. Re: Use DataSource of weblogic in a standalone Java file
4. Make sure you do not have any other 3rd party ojdbc jars unless if you really require for some reasons.