Where can I find documentation for the JNI package in Oracle Forms?

Oracle Forms provides a 开发者_如何学CPL/SQL package named JNI to interact with Java. Does anyone know where I may find this package's documentation? I have only been able to glean parts of its API by reading the existing PL/SQL libraries that come with Oracle Forms.

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These Oracle Java Importer docs say:

The ORA_JAVA package is a helper package that provides error handling, array, and persistency support. (There is also an internal JNI package used to call Java methods, but you do not need to know the contents of this package or call it directly.)

The reference for ORA_JAVA is here.