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So then why does the exact same code work for another class?

I guess I have to ask another developer within the company... I hate working in a different office from the rest of them.

Hence my thought that it's probably this one:

public GeneralClickList(T o){
super();
this.add(o);
}

Using a generic instead of specifying it.

I call it using this:...

I guess I'm not sure what you mean by 'how are you calling the constructor'? Maybe I'm just slow today.

Here are all the constructors for the class:

public class GeneralClickList<T extends...

Error: The constructor GeneralClickList<DCNotification>(Vector<DCNotification>) is undefined

Constructor (I think... there are several):
public GeneralClickList(Collection<? extends T> c) {
...

I'm copying some code from another location and I'm confused about something that isn't working:

return new GeneralClickList<DCNotification>((Vector<DCNotification>)...