Generic Exceptions suck

gistfile1.java

public interface Request<R, E extends Exception> {
  public R process() throws E;
}

public class Processor {
  public <R, E extends Exception> R process(Request<R, E> request) throws E {
    E lastException = null;
    for (int x = 0; x < retries; ++x {
      try {
        return request.process();
      }
      catch (E e) {
        lastException = e;
      }
    }
    throw lastException;
  }
}