Question

Why does this not work?

    if ((List)query.execute().size() > 0)

Since execute() returns a List, I thought I could call the size() method on it?

Answer 1

You’re casting the result of the size() method to a List.

Instead, try this:

if ( ((List) query.execute()) .size() > 0)

Edit: And yea, as Adeel says: Why are you casting it in the first place? Does execute() return an Object? Otherwise, you can just lose the cast.