In my code I get an script engine reference:

this.engine = new ScriptEngineManager().getEngineByName("JavaScript");

 

When using Java 8 (1.8.0_232 by AdoptOpen),  with Forge 36.x it will fail with:

java.lang.UnsupportedClassVersionError: org/openjdk/nashorn/api/scripting/NashornScriptEngineFactory has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0

 

When using Java 15, it works.  I had code prior that used the Nashorn package explicitly that was present in Java 8, and that was working.  I am trying to generify so that my mod can be used with later versions of Java, and I am hoping to have a single mod release that works with 1.16.4 as well as 1.16.5 since, well, MC 1.16.5 is bug fix release and is wire compatible with 1.16.4.

 

The questions I have are:

1. Is it even possible to use Forge 36.x with Java 8 and obtain a JavaScript engine reference using a generic factory method?

2. Is there a 1.16.4 Forge release that has the Nashorn engine that I could reference to bridge this gap?  I see from the change log that there was some work in Forge 35, but I do not see the downloads available.  (I am assuming this is intentional to encourage folks to move to 1.16.5.)

3.  Am I even looking at this issue correctly?  It's possible I am working from some bad assumptions.

 

 

Thank you!