How to set PATH environment variable in ProcessBuilder java in windows

Question

I am trying to set the PATH environment variable for the process builder in java, I tried the following:

ProcessBuilder pb = new ProcessBuilder(command);
Map<String, String> mp = pb.environment();
mp.put("Path", "myPath");
pb.start();

But the following did not work, the process builder picked the default system path. I came across this question and this trick his not helping me in my current project. What should I do to get around this?

Can you print all environment map values? It can be just case problem - PATH — kingoleg
– kingoleg, Commented Nov 18, 2014 at 13:10
The MAP has PATH and Path variables set. I saw the answer by Mike Clark in the same link above and I am wondering if what he has mentioned is correct behaviour . If it is then I am at loss. — Destructor
– Destructor, Commented Nov 18, 2014 at 13:19
What do you mean "did not work"? I've just checked and it works for me. — kingoleg
– kingoleg, Commented Nov 18, 2014 at 15:53
I had an executable mystuff.exe in C:\mystuff and this was not in PATH variable, so I added this to PATH variable and tried using ProcessBuilder with command as just: mystuff.exe <parameters> , even though PATH was set it complained that mystuff.exe file not found. So I had to resort to using full path instead of just mystuff.exe. — Destructor
– Destructor, Commented Nov 18, 2014 at 17:14
I think that pb.environment() set env variables for a proccess, but it doesn't use Path from it to find your comment in constructor. — kingoleg
– kingoleg, Commented Nov 19, 2014 at 14:41

kingoleg · Accepted Answer · 2014-11-19 14:44:43Z

15

Path is used in a new proccess. It doesn't used to find your command.

You can try the next solution. Run cmd.exe (bash etc.) and then run your command.

Example:

public class Test {

    public static void main(String[] args) throws IOException {
        ProcessBuilder pb = new ProcessBuilder("cmd.exe", "/C", "start", "mystuff.exe");
        Map<String, String> envs = pb.environment();
        System.out.println(envs.get("Path"));
        envs.put("Path", "C:\\mystuff");
        pb.redirectErrorStream();
        pb.start();

    }

}

answered Nov 19, 2014 at 14:44

kingoleg

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