URLClassLoader loads Annotation as com.sun.$Proxy$27

Question

I\'m trying to dynamically load a java class. The basic idea is, that a jar contains modules which get loaded dynamically at runtime. This is how I do it (I know it\'s hacky

Answer 1

The fact that you get a proxy in front of your annotation type should not matter. It might actually mislead you into believing that this is the cause for problems you are having. If stuff like "isAnnotationPresent(..)" fails, it is not due to that proxy, it is because you have loaded the annotation class multiple times using multiple classloaders. For example, Jetty gives priority to the WebApp classloader by default. So if your Jetty server instance (or Tomcat or whatever) already has loaded the annotation class, and the annotation is on your WebApp's classpath, too, you can have problems like "getAnnotation()" not returning anything. Just make sure that the library containing your annotation is not loaded twice.

The solution provided by Andreas is, well, a very dirty workaround and just covers up the fact that you probably don't have your classloading under control/properly organized.