executing a python script on windows using java Runtime.exec

Question

I have a python script that runs on windows and uses win32 extensions and WMI to get some information. If I run the script using the command line, it executes perfectly. But, if I try to run the same script using java Runtime.exec("python myscript.py") it seems to get blocked on the waitFor(). The code is like this:

Process p = Runtime.getRuntime().exec("python myscript.py");
int exitCode = p.waitFor();

If I try to use this same java code with some very simple python script like

print "hello world"

I get the exitCode to be 0, which means it works. Can I execute a python script that imports WMI library, using java Runtime.exec()?

Thanks

Answer 1

One likely reason is that your IO buffers are full and need to be flushed, so try flushing both stdout and stderr from your Process in the java code ( example code ).

Alternatively, you could try redirecting all output to NUL or a text file with one of the following arguments to exec:

cmd.exe /c python myscript.py > NUL 2>&1

cmd.exe /c python myscript.py > output.txt 2>&1