Running a process within a java program

Question

Hi
I have code that runs a process for performance monitoring on an installed system. When I run the code standalone as below, it runs fine. If I include the code below inside another java program, the process fails to execute and the status returned is non-zero (failed to execute).
The process requires the PATH and LD_LIBRARY_PATH to be set which seem to be set correctly when i print them out. So, I am not sure why the process doesnot run when included within another running java program.
Can someone please point out what I maybe missing?
Thanks!!
public class RunPerf
  private static final String CLASS_NAME = "RunPerf"; private static Process proc = null;
public static void main(String[] args)
    String INSTALLPERF_SAW_UNIX_COMMAND = "sawexe" + " " + "-perf";
         StringBuffer path1 = new StringBuffer(30);StringBuffer ldlibpath1 = new StringBuffer(30);
    System.setProperty("user.home", "/home/user");
    StringBuilder commandToExecute = new StringBuilder();
   commandToExecute.append(System.getProperty("user.home"));
   commandToExecute.append(File.separator);
   commandToExecute.append("web");
   commandToExecute.append(File.separator);
   commandToExecute.append("bin");
   commandToExecute.append(File.separator);
     String path = System.getProperty("user.home")+"/server/bin/" + File.pathSeparator + System.getProperty("user.home")+ "/web/bin";
       path1.append( path );
       path1.append( File.separator );
       path1.append( System.getProperty("java.library.path") );
       path1.append( File.separator );
      String env_value = null;
     String[] ldargs = {"LD_LIBRARY_PATH"};
     for (String env: ldargs) {
            env_value = System.getenv(env);
         System.out.println("LD_LIBRARY_PATH value before setting property= " + env_value);
            if (env_value != null) {
           String newldlibpath = System.getProperty("user.home")+ "/server/bin/" + File.pathSeparator + System.getProperty("user.homee")+ "/web/bin" ;
            ldlibpath1.append(newldlibpath);
            ldlibpath1.append(File.separator);
               ldlibpath1.append(env_value);
               ldlibpath1.append( File.separator);
                System.out.format("%s=%s%n", env,ldlibpath1.toString());
            } else {
                System.out.format("%s is not assigned.%n", env);
             commandToExecute.append(INSTALLPERF_SAW_UNIX_COMMAND);
               String[] envp =   { "USER_HOME =" + "/home/user",          "PATH=" + path1.toString(), "LD_LIBRARY_PATH=" + ldlibpath1.toString() };
           int status = executeCommand1(commandToExecute.toString(), envp,null);
               if(status != 0){
                      System.out.println("Unable to run perf Unix") ;
     public static int executeCommand1(String command,String[] envp, Logger logger) {
        String METHOD_NAME = "executeCommand1";
        if (logger == null) { logger = Logger.getAnonymousLogger();}
        logger.entering(CLASS_NAME, METHOD_NAME, new Object[] { command, envp});
        Runtime runtime = Runtime.getRuntime();
        runtime.addShutdownHook(new Thread() {
                    public void run() {
                        if (proc != null) {     try {  proc.destroy();  if (proc != null) { proc.destroy();  }
                            } catch (Exception e) {
                                e.printStackTrace(); }      }      }     });               
                       int retVal = 0;
      File cwd = new File(System.getProperty("user.home")+ "/web/bin/");               
                       try {
                           if (envp != null) {   proc = runtime.exec(command, envp,cwd); }
                                   else {  proc = runtime.exec(command); }
                           Thread t_err =        new Thread(new StreamReader(proc.getErrorStream()));
                           t_err.start();
                           Thread t_in =     new Thread(new StreamReader(proc.getInputStream()));
                           t_in.start();
                           retVal = proc.waitFor(); } catch (IOException e) {        retVal = -1;   logger.severe("IOException");      }
                                 catch (Exception e) { retVal = -1;        logger.severe("Exception");                  }
                 logger.exiting(CLASS_NAME, METHOD_NAME, retVal);
                 return retVal;
static class StreamReader implements Runnable {
        InputStream in;
        public StreamReader(InputStream genericStream) {   in = genericStream;   }
        public void run() {
            try {
                String strTemp = null;
                BufferedReader buffReader = new BufferedReader(new InputStreamReader(in));
                while ((strTemp = buffReader.readLine()) != null) {
                    System.out.println(strTemp);                }
            } catch (Exception e) {               e.printStackTrace();            }        }    }}

Answer 1

Either set up a script before the program runs or have the
program write a script file which contains the statements
that need to be executed. Then you will be able to
execute the script with a call to
Runtime.getRuntime().exec()Mark