Calling Java from Python fails even though 'java' works in Windows command line

Question

os.system('java') or os.system('java -jar ...')

returns

'java' is not recognized as an internal or external command, operable program or batch file.

However, when I call "java" from command line, it works perfectly fine. The directory with java.exe is in my path. os.system('C:\Windows\System32\java.exe') also does not work. Also, os.system('find') or os.system('ftp') also work, even though they are also exe's in System32.

ikz - please learn about formatting your posts. They will be much more readable. — Marcin
– Marcin, Commented Jul 25, 2012 at 20:38
I tried os.system ('C:\\Windows\\System32\\java.exe') and os.system('C:/Windows/System32/java.exe') etc. and they resulted in the same error. Interestingly, I tried adding the openjdk/jre directory to the PATH and apparently that worked. I still don't understand why the executable there should work when the system32 one doesn't. — xli
– xli, Commented Jul 25, 2012 at 22:56

Rob Volgman · Accepted Answer · 2012-07-25 20:22:40Z

2

This is because python doesn't have the same paths as your regular command line. You might be having a problem with escape characters - try using forward slash instead of backslash, or using a raw string. os.system('C:/Windows/System32/java.exe')

answered Jul 25, 2012 at 20:22

Rob Volgman

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