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the Infinispan tree module is not included in AS7. It is however distributed as part of the Infinispan distribution.
If you need it you should package it as part of your application. Note that the tree module is there only for backwards compatibility and does not receive active maintenance, so you should eventually look into migrating your code to use the map cache API provided by infinispan core (maybe compositing your keys in a tree-like fashion).
Thanks for your helpful reply. We will evaluate the additional changes required to remove the tree dependencies.