I used this line to execute a python script from a java application:
Process process = Runtime.getRuntime().exec("python foo.py", null, directory);
The script runs a TCP server that communicates with my java app and other clients.
When I was debugging the script I had a few console prints here and there and everything was fine. As soon as the script was launched from Java Code, after a fixed time my TCP server was not responding. Following some time of debugging and frustration I removed my prints from the script and everything worked as expected.
It seems that there is some memory allocated for the process' standard output and error stream and if you don't consume it the process gets stuck while trying to write to a full buffer.
How to launch the process so that I don't have to consume the standard output stream? I'd like to keep the prints though for debugging, but don't want to start a thread that reads a stream that I don't need.
You have to consume the child process's output, or eventually it will block because the output buffer is full (don't forget about stderr, too). If you don't want to modify your Java program to consume it, perhaps you could add a flag to your script to turn off debugging altogether or at least direct it to a file (which could be /dev/null).