Can someone post links to get a good jdbc related issues and troubleshooting tools?
WebLogic Server (WLS) Support Pattern: Investigating JDBC Issues (Doc ID 1280894.1)
Master Note on Oracle WebLogic Server JDBC/Database/Drivers Support Patterns (Doc ID 761097.1)
You can also check Datasource Tuning Guide.
Tuning Data Source Connection Pools - 11g Release 1 (10.3.6)
If you have any particular problem, you can let us know to provide additional information.