How to work with JOSM Scripting Plugin and APIv3

According to plugin documentation all old API and the RhinoJS engine are deprecated, I have to move to Graal.JS and APIv3.

I installed the Graal jars and linked them to the command line starting JOSM. On console I can see the message INFO: GraalVM is present ... which makes me believe that the installation is successful.

After reading through the API documentation I thought I have figured out how to migrate my script, but running it failed with some “not found” error.

So I reduced the script to the very basic sample from the documentation:

import josm from 'josm'
josm.alert('num layers: ' + josm.layers.length)

Still, trying to run this with Graal selected as Engine gives me this error message:

Error: Error reading: D:\osm\josm\josm

This looks like it is failing to load josm.mjs from the import.

Did I miss something on the installation? I was expecting that the scripting plugin somehow magically includes the es modules of the v3 API, so graal finds it.

If I manually extract the JS from the scripting jar and palce it in a folder besides josm, then it tries to search at another location which is not existing:

Error: Error reading: D:\es-module-repo\6ba5091e-5fe2-4445-8ded-873fcb00ca19\josm.mjs

What is the right way to use the script? JOSM latest, Java-17 and windows.

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