How to find classes in .war file right after deployment

I want to inspect some classes in my .war file right after I have deployed it. But I don't know how to achieve this (most likely due to my lack of JavaEE understanding).

I tried something like below using ClassPath from google's Guava library. It finds all sorts of classes when I pass “com” as an argument. However when passing “com.mypackage” nothing is found.

Any help is appreciated.

@Startup
@Singleton
public class Inspector {

    @PostConstruct
    public void inspect() {
        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
        //ClassLoader classLoader = ClassLoader.getSystemClassLoader(); // doesn't make any difference
        ClassLoader classLoader = this.getClass().getClassLoader(); // // doesn't make any difference
        try {
            for (final ClassPath.ClassInfo info : ClassPath.from(classLoader).getTopLevelClassesRecursive("com.mypackage")) {
                    System.out.println(info.getName());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }   

    } 
    ….
    ..