How to change the file permission?

Hi,
when i create a file in UNIX, i want change the permission file,
I used
Process pgrant = Runtime.getRuntime().exec("chmod 777 "+file.getName());
but i riceive the following error
java.io.IOException: chmod: not found
What can i do?
Regards,
esmeralda13

either call the chmod executable with it's full path, or make sure that the shell your Java app is running in has it's path set correctly.
- K

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