Reflection in Numbers and Primitive Arguments in a Method

Question

Hi ,
I am trying to invoke a method which has primitive or Number arguments, my problem is that when i do method.invoke( ) it gives an instantiation exception, because it was trying to do clazzT.newInstance( ) where clazzT happened to be int.class ... ? so how do i create a new Instance of such a primitive to add it to argument list while doing method.invoke ?
so what i mean is, have a method like :
public void doSomething(int x){
}and i am trying to do a method.invoke( ) in a for loop with all the methods of the classes ...
anyone!? please i am trying to figure this out for a while!? :)
Rick

Answer 1

public class AnnotationFinderLogger implements InvocationHandler{
     private static final String CONST_NULL = "null";
     private Object target;
      * @param target
     public AnnotationFinderLogger(Object target){
          this.target = target;
      * @param <T>
      * @param clazz
      * @throws Throwable
     public <T> void find(Class<T> clazz) throws Throwable{
          if(clazz == null){
               throw new NullPointerException("[ Reason ] : " + clazz);
          Annotation annotation = clazz.getAnnotation(IsLoggable.class);
          if(annotation == null) {
               // skip it
               return;
          }else if(annotation.annotationType().equals(IsLoggable.class)){
               T t = clazz.newInstance();
               System.out.println("[ length ] = [ " + t.getClass().getMethods().length + " ] ");
               // instantiate proxy for the class given
               createProxy(t);
               Method[] methods = clazz.getMethods();
               for(Method method : methods){
                    if(method.getAnnotation(Log.class) != null && Modifier.isPublic(method.getModifiers())){
                         Object[] args;
                         // adds to the list of parameters by invoking clazz.newInstance( ) to gain the Object
                         List<Object> tempList = inspectParameterTypes(method);
                         args = tempList.toArray();
                         this.invoke(t, method, args);
      * @param <T>
      * @param t
     private <T> Object createProxy(T t) {
          return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),
                                        new Class[] {}, new AnnotationFinderLogger(t));
      * @param method
      * @return
      * @throws InstantiationException
      * @throws IllegalAccessException
      * @throws NoSuchMethodException
      * @throws SecurityException
     private List<Object> inspectParameterTypes(Method method) throws InstantiationException, IllegalAccessException, SecurityException, NoSuchMethodException {
          Class<?>[] arrayClass = method.getParameterTypes();
          // Assume no more than 6 args, Suns convention ;)
          Object[] args = null;
          List<Object> tempList = new ArrayList<Object>();
          // loop through parameter types
          for(Class<?> clazzT : arrayClass){
               System.out.println(" clazzT = " + clazzT.getName());     
               if(!clazzT.isPrimitive() && !clazzT.isArray()){
                    Object o  = clazzT.newInstance();
                    tempList.add(o);
               }else if(clazzT.isAssignableFrom(int.class)){
                    Integer argument = int.class.newInstance();
                    tempList.add(argument);
          return tempList;
     @Override
     public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
          System.out.println(" [ Begin ] : [ " + method.getName() + " ] ");
          for(int i = 0 ; i < args.length; i++){
               System.out.println(" [ Arguments] : [ " + args[i] + " ] ");
          Object returnValue = method.invoke(target, args);
          System.out.println(" [ Exiting ] : [ " + method.getName() + " ] ");
          System.out.println(" [ Return Values ] : [ " + returnValue + " ] ");
          return returnValue;
}here's my proxy code. I am checking for @Log annotation and then invoking the methods, when i invoke the methods i have to pass in the argument types, in that case i would need to check if its a primitive or not etc ...
I am kinda lost now ... x_x
Regards
Vyas, Anirudh