Processing, Java & jpype on non-ASCII paths (good news and maybe a small issue)

[villares]

It looks like jpype 1.5.2 finally fixed the issue of starting a JVM on a non-ASCII path, yay!

I made a very naive test, updated jpype on my "Thonny portable with py5 distribution for Windows" with pip install jpyp1 --upgrade on Thonny's system shell, and it worked! Even after adding non-ASCII chars like é to Thonny folder's name, which contains the JVM.

I also checked the JAVA_HOME path on Thonny's options panel, and it reflected the renamed folder (as my portable thonny-py5mode plug-in hack always refreshes the JAVA_HOME settings).

The small issue that I'd like to investigate is this warning:

Picked up JAVA_TOOL_OPTIONS: -Djava.vendor="Sun Microsystems Inc."
java.lang.NullPointerException: Cannot invoke "java.net.URL.toURI()" because "jarURL" is null
	at processing.core.PApplet.calcSketchPath(PApplet.java:7173)
	at processing.core.PApplet.runSketch(PApplet.java:9942)

Note that this warning doesn't appear without non-ASCII chars on Thonny's JVM path. I couldn't reproduce on Processing 4 Java (by trying to add non-ASCII chars to the sketchbook or Processing IDE paths)

The funny thing is that even with the warning, py5 sketches run OK and even print(py5.sketch_path()) seems work alright... so I suppose this is not a big problem.

[hx2A]

Thank you for looking in to this!

The small issue that I'd like to investigate is this warning:
...
Note that this warning doesn't appear without non-ASCII chars on Thonny's JVM path. I couldn't reproduce on Processing 4 Java (by trying to add non-ASCII chars to the sketchbook or Processing IDE paths)

That warning seems to come from this code:

https://github.com/processing/processing4/blob/fe152b752d1a37fa5095f23757fc25488ded6c79/core/src/processing/core/PApplet.java#L7172

Can you reproduce it with Processing 4 Java if you explicitly call Processing's sketchPath() method? That public method makes a call to that protected calcSketchPath(). It could be that the warning doesn't appear then because the method just doesn't get called.

I don't understand what this warning is about. I see that getLocation() can be null in some situations, and that must be the case here. The code seems to suggest that it was expected that this wouldn't work all the time. Still, it would be nice to remove warnings like this if possible.

[hx2A]

(Notice that you only get the Cannot invoke "java.net.URL.toURI()" if you start a proper sketch with py5.run_sketch())

Wait, you only get that warning when you use py5.run_sketch(), and not when you use Thonny? When you run a sketch via Thonny in imported mode, there is still a call to py5.run_sketch() on your behalf.

[villares]

Sorry, I wasn't clear, what I meant is that you must run a sketch, either imported mode or module mode will trigger the warning.

[hx2A]

Can you try this with just jpype?

import jpype
jpype.startJVM()

The warning could be from something jpype is doing or not doing.

[villares]

No, no warning with that. Neither with just import py5.

[hx2A]

I see. Still, it could still be a jpype problem if jpype is not doing something that sets up py5 to trigger the warning when the Sketch runs.

[GoToLoop]

This is what I've got using Python's REPL from my Garuda Linux terminal via a custom venv:

python
Python 3.13.2 (main, Mar  6 2025, 06:42:22) [GCC 14.2.1 20250207] on linux
Type "help", "copyright", "credits" or "license" for more information.

>>> import py5
>>> import py5_tools

>>> py5_tools.get_jvm_debug_info()
{
  'JAVA_HOME environment variable': '/usr/lib/jvm/default',
  'jvm version': (21, 0, 6),
  'default jvm path': '/usr/lib/jvm/java-21-openjdk/lib/server/libjvm.so'
}

>>> from java.lang import System

>>> System.getProperty("java.version")
'21.0.6'

>>> System.getProperty("java.vendor")
'Arch Linux'

>>> System.getProperty("java.home")
'/usr/lib/jvm/java-21-openjdk'

>>> System.getenv("JAVA_HOME")
'/usr/lib/jvm/default'

P.S.: I have the variable $JAVA_HOME globally defined in this system file "/etc/environment" btW:

#
# This file is parsed by pam_env module
#
# Syntax: simple "KEY=VAL" pairs on separate lines
#

JAVA_HOME=/usr/lib/jvm/default
GRAALVM_HOME=/usr/lib/jvm/java-22-graalvm

TMPDIR=/tmp

PS1='[\u@\h \W]\$ '
COMP_WORDBREAKS=" /\'><;|&("