I think we are arguing over the definition of "leak". When you have one developer producing a data structure used by another developer, this kind of leak is an

I think we are arguing over the definition of "leak". When you have one developer producing a data structure used by another developer, this kind of leak is an easy mistake to make. I think in the sense of answering the Stack Overflow question, that makes it a more useful answer than the examples about ClassLoaders and non-heap resources.