Create a CacheEntryEventListener and register with:

class MyEntryEventListener implements CacheEntryEventListener{
      ...
    }
    MyEntryEventListener listener = new MyEntryEventListener();

// This call succeeds because CacheEventListener.isAssignableFrom(listener.getClass())
  
cacheAdmin.getCache().addCacheEventListener(listener, listener.getClass());
 -------------------------
This listener is never invoked because Cache.dispatchCacheEntryEvent has a guard condition:
if (listener[i]==CacheEntryEventListener.class){
   // notify next object in the list
}

This is incorrect it should use isAssignableFrom() or better yet, remove altogether. It is not needed since addCacheEventListener(listener, listener.getClass()); already does the validation.

Note that it would also be better to deprecate addCacheEventListener(CacheEventListener listener, Class clazz); and replace with
addCacheEventListener(CacheEventListener listener); Why do you need to pass the class as a parameter (except to work around this bug)?

The class should be determined using listener.getClass();