Hi Steven,
can you check if you have below jar files from the client directory to exe.
ojdbc6.jar
ojdbc14.jar
Also do verify you have below SHLIB_PATH path as =/usr/sap/NP3/SYS/exe/run:/oracle/client/11x_64/instantclient
And can you give try with a oracle_home as /oracle/NP3/11204
Let me know if that works.
Regards,
Ram