When executing the ETL process for the P6 Reporting Database you will be running startetl.bat or .sh. In this file there is a JAVA_INVOKER_PREFIX.
This will have pre-determined options that are needed by the ETL process. If you need to include additional java options they can be added to this parameter. One item that may need to be added is to ensure there is enough entropy on this server. If issues are encountered making a JDBC connection it could be related to the entropy on the machine. Validate that the server has enough entropy. If there are a low about about of entropy please contact system administrator for server. The ETL process needs to make both TNS and JDBC connections.