Hello, I have a method on my business model that return a parameterized type: public <P extends Profile> P getProfileValidAt(Class<P> profileClass, Calendar validAt) { List<P> history = getHistoryProfile(profileClass); for(P profile: history) { if (profile.getValidFrom().compareTo(validAt)<=0 && profile.getValidTo().compareTo(validAt)>=0) { return profile; } } return null; } I use jbossrule 3.0.3. I my drl files, i use this method but it doesn't work. I have a compilation error on the rules. If i change parameterized type to a specific profile class, it works. Do jbossrule accept parameterized type as return value type ? Thanks in advance.