If possible, encourage your organization to migrate to Oracle Forms 12c , which uses the standard Java Plugin or the "Standalone Launcher" that removes the need for JInitiator entirely.
To get JInitiator 1.3.1.22 running on modern machines, keep these tips in mind: Jinitiator 1.3.1.22 Download
This software has not been patched in years and contains known vulnerabilities. If possible, encourage your organization to migrate to