Executing Unix command through Java

Question

Hi,
Hi, I am trying to run some unix command through:
Runtime.getRuntime().exec("some unix command line");
I am running the code on Linux platform. However, I always got some errors. Here are the stack trace of them:
java.io.IOException: Cannot allocate memory
java.io.IOException: java.io.IOException: Cannot allocate memory
        at java.lang.UNIXProcess.<init>(UNIXProcess.java:148)
        at java.lang.ProcessImpl.start(ProcessImpl.java:65)
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:451)
        at java.lang.Runtime.exec(Runtime.java:591)
        at java.lang.Runtime.exec(Runtime.java:429)
        at java.lang.Runtime.exec(Runtime.java:326)Anybody has any idea why is this happening? Thanks.
Aulia

Answer 1

Hi, thanks for your reply so far. I tried the following code:
     public boolean executeCommand() {
          boolean success = true;
          for (int i = 0; i < 5; i++) {
               Process p = null;
               try {
                    p = Runtime
                    .getRuntime()
                    .exec("ls");
                    InputStreamReader inR = new InputStreamReader(p
                              .getErrorStream());
                    BufferedReader buf = new BufferedReader(inR);
                    String line;
                    while ((line = buf.readLine()) != null) {
                         System.out.println(line);
                    p.destroy();
               } catch (Exception e) {
                    System.err.println(e.getMessage());
                    e.printStackTrace();
                    success = false;
               } finally {
                    p = null;
          return success;
     }However, it still throws the same exception. Yes, I put it in a tight loop, but not recursively.