(Why) Is Java not available in a thread-based environment?

Question

Xiaoxing Zhang 2024-3-15

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2094751-why-is-java-not-available-in-a-thread-based-environment

评论： Jan Kappen 2024-5-22

From my experience, using Java features (e.g. java.util.LinkedList) is smooth within MATLAB. However, these features are unavailable when called from a thread-based environment. A simplified example would be:

msgbase=javachk('jvm');
ph=parpool('Threads',2);
f=parfeval(ph,@jthreads,1);
[~,msgth]=f.fetchNext();
delete(ph);
function MSG=jthreads()
MSG=javachk('jvm');
end

Where msgbase would be empty, indicating Java is usable, but msgth would be 'This feature is not supported because:Java is not currently available.' I was not able to find a official statement on this issue, or a previous insightful discussion.

Is this expected behavior?
Can I modified settings or append some parameters to enable Java features inside a thread-based environment?
I'm not familar with C MEX funtions but I could learn. However, is C MEX functions supported inside a thread-based environment?

Thanks and regards!