Error while Debugging

Question

public static void main(String[] args) throws java.io.FileNotFoundException,
      java.io.IOException,
      java.lang.InterruptedException {
    fileName = new String(args[args.length-1]);
    // set up the parser and scanner with the appropriate file
    // name
    FileReader aslFile = new FileReader(fileName);
    NolifeScanner scanner = new NolifeScanner(aslFile);
    NolifeParser parser = new NolifeParser(scanner);hi all,
I am debugging a java program in Eclipse 3.2.1 in debug perspective.
When I'm just running the program it's fine. But when I'm launching the debugger, and trying to step into the NoLifeParser() it stops and shows me the error message like this:
ClassLoader.class
Source not found
The source attachment does not contain the source for the ClassLoader.class
You can change the source attachment by clicking Change Attached Source below:
BUTTON
and then the source code for ClassLoader class.
Please help, I'm struggling =(
Thanks in advance,....!!

Answer 1

package frontend;
import java.io.FileReader;
import frontend.ast.*;
import frontend.parser.*;
* This class contains the main routine for the Nolife compiler. It
* the scanner and parser and then processes the input file.
public class Nolife {
  public static String fileName=null ; // the name of the input file
  public static boolean generateInterpreterCode = false;
   * @return the input file name
  static String getFileName() {
    return fileName;
   * The main routine for compiling and Nolife program
   * @param args the command-line arguments
* @param args
* @throws java.io.FileNotFoundException
* @throws java.io.IOException
* @throws java.lang.InterruptedException
public static void main(String[] args) throws java.io.FileNotFoundException,
      java.io.IOException,
      java.lang.InterruptedException {
    fileName = new String(args[args.length-1]);
    // set up the parser and scanner with the appropriate file
    // name
    FileReader aslFile = new FileReader(fileName);
    NolifeScanner scanner = new NolifeScanner(aslFile);
    NolifeParser parser = new NolifeParser(scanner);
    boolean error = false;
    // parse the input file and return the intermediate
    ProgramNode prog = null;
    try {
      prog = parser.program();
    catch (antlr.SemanticException e) {
      System.err.println("Semantic Error: " + e);
      error = true;
    catch (antlr.RecognitionException e) {
      System.err.println("Syntax Error: " + e);
      error = true;
    catch (antlr.TokenStreamException e) {
      System.err.println("Syntax Error: " + e);
      error = true;
    if (error) {
      System.exit( -1);
    AbstractSyntaxTree ast = new AbstractSyntaxTree(prog);
    ast.typeCheck();
    if (AbstractSyntaxTree.error)
      System.exit(-1);
}