Question

So here is my code:

System.out.print("hellow");
    try {
        int x;
        Runtime rt = Runtime.getRuntime();
        Process proc = rt.exec("java CPU/memory");
        BufferedReader in = new BufferedReader(new InputStreamReader(proc.getInputStream()));
        String line = null;
        while((line = in.readLine())!=null) {
            System.out.println(line);
        }
        proc.waitFor();
    } catch (Throwable t)
    {
        t.printStackTrace();
    }
 $

When I run java CPU/CPU in cmd I get
“hellowhello” with exit value of 0

But when I run it in eclipse I just get
“hello” with exit value of 1

Any idea?

Answer 1

You have different system environment in executing from command string and executing from Eclipse.

Variables of environment are valuable : PATH, JAVA_HOME or JRE_HOME and your current worikng directory.

I use ProcessBuilder in cases, when I must be sure in environment, that is provided for external process like yours “java CPU/memory”.

I think that first of all your external process have wrong working directory.
In ProcessBuilder you can point on it with:

ProcessBuilder pb = new ProcessBuilder("java", "CPU/MEMORY");   
pb.directory(new File("/home/myhome/myjavaprojects"));
Process p = pb.start();