Problem in making "jar" file

Question

Hi ,
I have to compile , preverify and make jar file using a set of J2ME files.
And i have completed the first 2 steps (compiling and preverifying).
I used this code to make jar file:
jar cvfm F:\Mobile_Magazine_IDE\xxx_test3\Magazine.jar F:\Mobile_Magazine_IDE\xxx_test3\src\MANIFEST.MF  -C  F:\Mobile_Magazine_IDE\xxx_test3\preveryclasses\  . -C F:\Mobile_Magazine_IDE\xxx_test3\src\images\  .
  boolean compile_n_print_output_to_console(String command){
    boolean isCompiled = false;
    try {
      txa_console_output.setText("");
      Runtime runtime = Runtime.getRuntime();
      Process proc = runtime.exec(command);
      InputStream stderr = proc.getErrorStream();
      InputStreamReader isr = new InputStreamReader(stderr);
      BufferedReader br = new BufferedReader(isr);
      String line = null;
      while ( (line = br.readLine()) != null)
        txa_console_output.append(line + new_line);
      int exitVal = proc.waitFor();
      //If this returns any value other than zero ... compilation failed
      if(exitVal!=0){
        call_error_message("Compilation failed ");
      //If this returns zero ... compilation is successful
      else if(exitVal==0){
        isCompiled = true;
        call_info_message("Build successful !");
    catch (Exception ex) {
      isCompiled = false;
      System.out.println(ex);
      com.zone.logger.LoggerClass.log_output(ex);
    return isCompiled;
  }The program is generating the jar file but it does not return a boolean value.
I think it's because it has not completed the process.
But no exception is shown.
I used the same code to compile and preverify , and they work fine.
And one more thing when i use the same source code and compile those using well known IDE it compiles and works without a problem.
Can anyone tell me where i have done the mistake ?
Thanks in advance !

Answer 1

http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html