How to retrieve element value of XML using Java?

You can make a class which extends org.xml.sax.helpers.DefaultHandler and call

start_<tag_name>(Attributes attrs);

and

end_<tag_name>();

For it is:

start_request_queue(attrs);

etc.

And then extends that class and implement xml configuration file parsers you want. Example:

  ...
  public void startElement(String uri, String name, String qname,
                           org.xml.sax.Attributes attrs) 
                  throws org.xml.sax.SAXException {
    Class[] args = new Class[2];
    args[0] = uri.getClass();
    args[1] = org.xml.sax.Attributes.class;
    try {
      String mname = name.replace("-", "");
      java.lang.reflect.Method m = 
            getClass().getDeclaredMethod("start" + mname, args);
      m.invoke(this, new Object[] { uri, (org.xml.sax.Attributes)attrs }); 
    }

    catch (IllegalAccessException e) {
      throw new RuntimeException(e);
    }

    catch (NoSuchMethodException e) {
      throw new RuntimeException(e);    }

    catch (java.lang.reflect.InvocationTargetException e) {
      org.xml.sax.SAXException se = 
            new org.xml.sax.SAXException(e.getTargetException());
      se.setStackTrace(e.getTargetException().getStackTrace());
    }

and in a particular configuration parser:

   public void start_Request(String uri, org.xml.sax.Attributes attrs) {
     // make sure to read attributes correctly
     System.err.println("Request, name="+ attrs.getValue(0);
   }