How to scan classes for annotations?
guava, guice, java, servlets
Solution
You can use the Reflections library by giving it the package and Annotation you are looking for.
Reflections reflections = new Reflections("my.project.prefix");
Set<Class<?>> annotated = reflections.getTypesAnnotatedWith(Controller.class);
for (Class<?> controller : annotated) {
RequestMapping request = controller.getAnnotation(RequestMapping.class);
String mapping = request.name();
}
Of course placing all your servlets in the same package makes this a little easier. Also you might want to look for the classes that have the `RequestMapping` annotation instead, since that is the one you are looking to get a value from.
Problem
I have a plain jane servlets web application, and some of my classes have the following annotations: ``` @Controller @RequestMapping(name = "/blog/") public class TestController { .. } ``` Now when my servlet applications starts up, I would like to get a list of all classes that have the @Controller annotation, and then get the value of the @RequestMapping annotation and insert it in a dictionary. How can I do this? I'm using Guice and Guava also, but not sure if that has any annotation related helpers.