Output of exec command

Question

Hi,
I'm trying to compile java files at runtime and I want to see the execution output into my eclipse consol or anywhere. I've tried different thing such as
          Runtime r = Runtime.getRuntime();
          String command="";
          command = "javac -verbose" +
                    " c:/workspace/helloworld.java";
          Process p = r.exec(command);
          Runtime r = Runtime.getRuntime();
          String command="";
          command = "javac c:/workspace/helloworld.java > c:/file.txt";
          Process p = r.exec(command);
But nothing seems to be output, I have no error/exception thrown in my eclipse console and the file isn't compile:\
Any idea?
Thanks

Answer 1

try
Runtime rt = Runtime.getRuntime();
Process proc = rt.exec("javac");
InputStream stderr = proc.getErrorStream();
InputStreamReader isr = new InputStreamReader(stderr);
BufferedReader br = new BufferedReader(isr);
String line = null;
System.out.println("<ERROR>");
while ( (line = br.readLine()) != null)
System.out.println(line);
System.out.println("</ERROR>");
int exitVal = proc.waitFor();
System.out.println("Process exitValue: " + exitVal);
} catch (Throwable t)
t.printStackTrace();
}