How do I setup using custom jar files with our application icons when running webstart

We upgraded our development environment from 11g to 12c and are now trying to use webstart instead of depending on using ie to launch the java applet. However, when we run the jnlp file to launch out application, the icons for our software do not appear. These are stored in jar files. I have moved these jar files to the <oracle Home>/forms/java location, and I have added the required lines to the extensions.jnlp, but still getting errors in trying to find the image files. Is there somewhere else I need to change something for the jnlp