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Thread: [Problem] What's wrong with my code

  1. #1
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    Default [Problem] What's wrong with my code

    I'm doing the modification of MOSS operating system simulator for scheduling part. I add a class for creating threads and display the thread name and priority. When i want to run the code it comes out the error" Exception occurred executing command line.
    Cannot run program "C:\Program Files\Java\jre6\bin\javaw.exe" (in directory "C:\Users\Sing\workspace\Moss"): CreateProcess error=740, The requested operation requires elevation"

    Code:
    package sched;
     
    // This file contains the main() function for the Scheduling
    // simulation.  Init() initializes most of the variables by
    // reading from a provided file.  SchedulingAlgorithm.Run() is
    // called from main() to run the simulation.  Summary-Results
    // is where the summary results are written, and Summary-Processes
    // is where the process scheduling summary is written.
     
    // Created by Alexander Reeder, 2001 January 06
     
    import java.io.*;
    import java.util.*;
    import java.lang.*;
     
    public class Scheduling {
     
      private static int processnum = 5;
      private static int meanDev = 1000;
      private static int standardDev = 100;
      private static int runtime = 1000;
      private static Vector processVector = new Vector();
      private static Results result = new Results("null","null",0);
      private static String resultsFile = "Summary-Results";
     
     
      private static void Init(String file) {
        File f = new File(file);
        String line;
        String tmp;
        int cputime = 0;
        int ioblocking = 0;
        double X = 0.0;
     
        try {   
          //BufferedReader in = new BufferedReader(new FileReader(f));
          DataInputStream in = new DataInputStream(new FileInputStream(f));
          while ((line = in.readLine()) != null) {
            if (line.startsWith("numprocess")) {
              StringTokenizer st = new StringTokenizer(line);
              st.nextToken();
              processnum = Common.s2i(st.nextToken());
            }
            if (line.startsWith("meandev")) {
              StringTokenizer st = new StringTokenizer(line);
              st.nextToken();
              meanDev = Common.s2i(st.nextToken());
            }
            if (line.startsWith("standdev")) {
              StringTokenizer st = new StringTokenizer(line);
              st.nextToken();
              standardDev = Common.s2i(st.nextToken());
            }
            if (line.startsWith("process")) {
              StringTokenizer st = new StringTokenizer(line);
              st.nextToken();
              ioblocking = Common.s2i(st.nextToken());
              X = Common.R1();
              while (X == -1.0) {
                X = Common.R1();
              }
              X = X * standardDev;
              cputime = (int) X + meanDev;
              processVector.addElement(new sProcess(cputime, ioblocking, 0, 0, 0));          
            }
            if (line.startsWith("runtime")) {
              StringTokenizer st = new StringTokenizer(line);
              st.nextToken();
              runtime = Common.s2i(st.nextToken());
            }
          }
          in.close();
        } catch (IOException e) { /* Handle exceptions */ }
      }
     
      private static void debug() {
        int i = 0;
     
        System.out.println("processnum " + processnum);
        System.out.println("meandevm " + meanDev);
        System.out.println("standdev " + standardDev);
        int size = processVector.size();
        for (i = 0; i < size; i++) {
          sProcess process = (sProcess) processVector.elementAt(i);
          System.out.println("process " + i + " " + process.cputime + " " + process.ioblocking + " " + process.cpudone + " " + process.numblocked);
        }
        System.out.println("runtime " + runtime);
      }
     
    (Begining of the part i modify)
      public static class StartThread extends Thread
      {
    	  Thread t;
    	  public void startThread()
    	  {
    		  System.out.println("Starting the child thread");
    		  start();
    	  }
     
    public void run()
      {
    	  t = Thread.currentThread();
    	  System.out.println(Thread.currentThread());
    	  System.out.println("Name of the thread is:" + t.getName());
    	  System.out.println("Priority of the thread is:" + t.getPriority());
    	  System.out.println("The current thread is alive:" + t.isAlive());
    	  t.setName("First");
    	  t.setPriority(10);
    	  //After change thread name and priority
    	  System.out.println("Thread name after changed:" + t.getName());
    	  System.out.println("Thread priority after changed:" + t.getPriority());
    	  t.stop();
    	  System.out.println("Thread alive status:" + t.isAlive());
     
      }
      static class DisplayThread extends Thread
      {
      public static void main(String args[]) {
    	  StartThread ob = new StartThread();
    	  System.out.println("Main thread name:" + Thread.currentThread().getName());
    	  ob.startThread();
    	  Thread maint = Thread.currentThread();
    	  System.out.println("Thread alive status:" + maint.isAlive());
    	  System.out.println(System.getProperty("user.dir"));
     
    (End of the part i modify)
        int i = 0;
     
        if (args.length != 1) {
          System.out.println("Usage: 'java Scheduling <INIT FILE>'");
          System.exit(-1);
        }
        File f = new File(args[0]);
        if (!(f.exists())) {
          System.out.println("Scheduling: error, file '" + f.getName() + "' does not exist.");
          System.exit(-1);
        }  
        if (!(f.canRead())) {
          System.out.println("Scheduling: error, read of " + f.getName() + " failed.");
          System.exit(-1);
        }
        System.out.println("Working...");
        Init(args[0]);
        if (processVector.size() < processnum) {
          i = 0;
          while (processVector.size() < processnum) {       
              double X = Common.R1();
              while (X == -1.0) {
                X = Common.R1();
              }
              X = X * standardDev;
            int cputime = (int) X + meanDev;
            processVector.addElement(new sProcess(cputime,i*100,0,0,0));          
            i++;
          }
        }
        result = SchedulingAlgorithm.Run(runtime, processVector, result);    
        try {
          //BufferedWriter out = new BufferedWriter(new FileWriter(resultsFile));
          PrintStream out = new PrintStream(new FileOutputStream(resultsFile));
          out.println("Scheduling Type: " + result.schedulingType);
          out.println("Scheduling Name: " + result.schedulingName);
          out.println("Simulation Run Time: " + result.compuTime);
          out.println("Mean: " + meanDev);
          out.println("Standard Deviation: " + standardDev);
          out.println("Process #\tCPU Time\tIO Blocking\tCPU Completed\tCPU Blocked");
          for (i = 0; i < processVector.size(); i++) {
            sProcess process = (sProcess) processVector.elementAt(i);
            out.print(Integer.toString(i));
            if (i < 100) { out.print("\t\t"); } else { out.print("\t"); }
            out.print(Integer.toString(process.cputime));
            if (process.cputime < 100) { out.print(" (ms)\t\t"); } else { out.print(" (ms)\t"); }
            out.print(Integer.toString(process.ioblocking));
            if (process.ioblocking < 100) { out.print(" (ms)\t\t"); } else { out.print(" (ms)\t"); }
            out.print(Integer.toString(process.cpudone));
            if (process.cpudone < 100) { out.print(" (ms)\t\t"); } else { out.print(" (ms)\t"); }
            out.println(process.numblocked + " times");
          }
          out.close();
        } catch (IOException e) { /* Handle exceptions */ }
      System.out.println("Completed.");
      }
    }
      }
     
    }
    [#][/#]

    Is there something wrong in the code?


  2. #2
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    Default Re: [Problem] What's wrong with my code

    Ok. I have fix the error. But i still cant run the thing as it gives me the error message of "java.lang.NoSuchMethodError: main
    Exception in thread "main" . I have the main method, but why i still receiving such error?

  3. #3
    Super Moderator Norm's Avatar
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    Default Re: [Problem] What's wrong with my code

    I have the main method
    Where is the main() method in the code you posted?

    How are you trying to execute the posted code?

  4. #4
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    Default Re: [Problem] What's wrong with my code

    look carefully, there is a main method there

  5. #5
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    Default Re: [Problem] What's wrong with my code

    Quote Originally Posted by Javanoo89 View Post
    Ok. I have fix the error. But i still cant run the thing as it gives me the error message of "java.lang.NoSuchMethodError: main
    Exception in thread "main" . I have the main method, but why i still receiving such error?
    Most probably you are trying to run the other class which doesn't have main().

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