On Wed, 11 Nov 2020, Andi Vajda wrote:
On Wed, 11 Nov 2020, Andrew Dalke wrote:
Hi all,
I am trying to use jcc on macOS 10.14.4 (Mojave) to build Python 3.9
bindings for cdk-2.3.jar from
https://github.com/cdk/cdk/releases/tag/cdk-2.3 .
I managed to build "pycdk" but when I run initVM() like this, from the
Python console:
import pycdk
pycdk.initVM()
the console freezes while Java opens an empty application UI on macOS
titled "bin". The pulldown "About bin" says simply "python".
My guess is that I need to set some Java VM configuration so it doesn't try
to connect to the Mac's window manager when it starts up.
I am effectively completely ignorant about Java development, and my
searches haven't found a way to do this.
Any pointers?
I don't remember what that parameter is but there is a way to disable AWT
when the Java VM starts and it's passed in like any other VM args.
for example: initVM(vmargs='-Xcheck:jni,-verbose:jni,-verbose:gc')
You need to find what that argument is (something with awt iirc) and use it
in the vmargs parameter passed to initVM(), which is empty by default.
There are *lots* of such arguments, "man java" is a good start.
Found it, it's called headless mode:
https://www.oracle.com/technical-resources/articles/javase/headless.html
Add this to initVM's vmargs: '-Djava.awt.headless=true'
Andi..
Andi..
In case it's relevant, I compiled jcc from svn as of 12 hours ago
pycdk.JCC_VERSION
'3.8'
I compiled Python from source.
I'm using the system Java:
% which java
/usr/bin/java
% ls -l /usr/bin/java
lrwxr-xr-x 1 root wheel 74 Mar 17 2019 /usr/bin/java ->
/System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java
% java -version
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)
Best regards,
Andrew
da...@dalkescientific.com
