Looking for a Java Parser

Question

Hi,
I'm working on a Web Service Project, and i'm trying to deploy Web Services dynamically. Now the problem is, that i have to adapt the Java src-files sometimes before the deployment (Like adding Annotations, Methods or just peaces of code into a Method. So what i'm looking for is some Sort of a Java Parser, that gives me information on where to insert the code i generated.
Simple example:
public class WSExample{
     public void doSomething(){
          //do something
//this class should be changed to something like this:
public class WSExample{
     @WebMethod       //Annotation added
     public void doSomething(){
          //do something
        //this Method is generated automatically
        @WebMethod
        public void doSomethingDifferent{
               //like establishing a connection to a different WS
}All i've found up to now are parser generators like antlr or javacc. But i couldn't find anything about how to use the generated parsers or even manipulate the parsed code, yet. I hope i don't have to write a parser or grammar myself. Maybe someone can link me to some useful tutorial, forum or whatever else might be helpful.

Answer 1

If you are using Sun's Java 1.4, you already have one. If you are using an ealier version, here are a couple of links:
Xerces is probably the most feature rich:
http://xml.apache.org/xerces2-j/index.html
GNU JAXP is also good and very small:
http://www.gnu.org/software/classpathx/jaxp/