I use WebSphere 8.5 to host my application and configured some JDBC resources on the application server. Also I developed a client application using the thin client runtime
If you wanna use Oracle JDK 8.0 with IBM Websphere, try to replace 'ibmorb.jar' in your classpath to a newer (that using new java.nio.charset.MalformedInputException class).
You can find it here:
Hope these help.