code: public boolean exists()
      {
          if (_exists)
              return true;
  
          if (_urlString.endsWith("!/"))
          {
              String file_url=_urlString.substring(4,_urlString.length()-2);
              try{return newResource(file_url).exists();}
              catch(Exception e) {LogSupport.ignore(log,e); return false;}
          }
          
          boolean check=checkConnection();
          
          // Is this a root URL?
          if (_jarUrl!=null && _path==null)
          {
              // Then if it exists it is a directory
              _directory=check;
              return true;
          }
          else 
          {
              // Can we find a file for it?
              JarFile jarFile=null;
              if (check)
                  // Yes
                  jarFile=_jarFile;
              else
              {
                  // No - so lets look if the root entry exists.
                  try
                  {
                      jarFile=
                          ((JarURLConnection)
                           ((new URL(_jarUrl)).openConnection())).getJarFile();
                  }
                  catch(Exception e)
                  {
                         LogSupport.ignore(log,e);
                  }
              }
  
              // Do we need to look more closely?
              if (jarFile!=null && _entry==null && !_directory)
              {
                  // OK - we have a JarFile, lets look at the entries for our path
                  Enumeration e=jarFile.entries();
                  while(e.hasMoreElements())
                  {
                      JarEntry entry = (JarEntry) e.nextElement();
                      String name=entry.getName().replace('\\','/');
                      
                      // Do we have a match
                      if (name.equals(_path))
                      {
                          _entry=entry;
                          // Is the match a directory
                          _directory=_path.endsWith("/");
                          break;
                      }
                      else if (_path.endsWith("/"))
                      {
                          if (name.startsWith(_path))
                          {
                              _directory=true;
                              break;
                          }
                      }
                      else if (name.startsWith(_path) && name.length()>_path.length() && name.charAt(_path.length())=='/')
                      {
                          _directory=true;
                          break;
                      }
                  }
              }
          }    
          
          _exists= ( _directory || _entry!=null);
          return _exists;
      }
docs: Returns true if the respresenetd resource exists.