why no output when calls "Runtime.getRuntime().exec(cmd);" in Linux?

Question

I tried to use Runtime.getRuntime().exec(cmd) to run out jad app to decompile .class file. cmd = "../bin/jad Test.class" But I cannot get the output by this way:

Process p = Runtime.getRuntime().exec(jadCmd2);
BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line = null;
while ((line = in.readLine()) != null) {
        System.out.println(line);
}

nothing output, can anyone tell?

must have misread the question, removed my answer to avoid any confusion... — posdef
– posdef, Commented Jul 3, 2012 at 8:30

Peter Lawrey · Accepted Answer · 2012-07-03 08:53:52Z

4

I suspect you are getting an error. I suggest you print that out as well.

If you use ProcessBuilder you can combine the output and error so you only have one stream to read.

From http://docs.oracle.com/javase/7/docs/api/java/lang/ProcessBuilder.html

 ProcessBuilder pb =
   new ProcessBuilder("myCommand", "myArg1", "myArg2");
 pb.redirectErrorStream(true);
 Process p = pb.start();

edited Jul 3, 2012 at 8:53

answered Jul 3, 2012 at 8:29

Peter Lawrey

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