JSI has been used for a while now enabling users to find their nearest Salvation Army services. Unfortunately, JSI does not work with Terracotta clustering server out-of-the-box. For this reason, I have marked PriorityQueue, SortedList, Node and RTree as Serializable.
Merge in fix to allow use with Terracotta clustering

* commit 'c367ddc951bf0019d2d646e8facdc73670b6a226':
  JSI has been used for a while now enabling users to find their nearest Salvation Army services. Unfortunately, JSI does not work with Terracotta clustering server out-of-the-box. For this reason, I have marked PriorityQueue, SortedList, Node and RTree as Serializable.