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Can I make the spring service classes final? Is there any harm doing that? Nobody is going to extend the class. Is there any issue?
public final class MyService {
// Depedencies go here.
}
Don’t make them
final. If you use any AOP (including transaction support) on concrete classes, spring will use CGLIB to dynamically extend your class in order to make a proxy. And the requirement for CGLIB to work is to have your classes non-final. Otherwise an exception will be thrown.