spring - How to intercept a method in java -

here method:

public static boolean startmodule(module mod, servletcontext servletcontext, boolean delaycontextrefresh) 

here method call in java file:

webmoduleutil.startmodule(module, getservletcontext(), false); 

i cannot make changes these files, want intercept method , add of code (i want access parameters well)

code wrote in java file not successful:

public void main(string[] args) throws exception {      module module = null;     webmoduleutil wmb = new webmoduleutil();     proxyfactory pf = new proxyfactory(wmb);     pf.addadvice(new methodinterceptor() {          public object invoke(methodinvocation invocation) throws throwable {             if (invocation.getmethod().getname().startswith("start")) {                 system.out.println("method " + invocation.getmethod() + " called on " + invocation.getthis()                         + " args " + invocation.getarguments());                 system.out.println("********************");                 object ret = invocation.proceed();                 system.out.println("method " + invocation.getmethod() + " returns " + ret);                 return ret;             }             return null;         }     });      webmoduleutil proxy = (webmoduleutil) pf.getproxy();     proxy.startmodule(module, getservletcontext(), false);       }  private static servletcontext getservletcontext() {     // todo auto-generated method stub     return null; } 

use aop programming. example try read aspectj.

ex code:

import org.aspectj.lang.proceedingjoinpoint; import org.aspectj.lang.annotation.*; import org.springframework.stereotype.service;  @aspect @service public class aspectdemo {  @around("aop1()" )  public object intercept(proceedingjoinpoint joinpoint) throws throwable {    (object obj : joinpoint.getargs()) {       log.debug(obj);    } }  @pointcut("execution(*my.example.packcage.startmodule.*(..))")   public void aop1() { }