I am not sure if I have mentioned this earlier, but there is a pluggable extension to Jackson JSON processor at:
which adds support for reading and writing HPPC container values in JSON, and a few other formats (YAML, CSV, Smile (binary JSON), even XML).
Current version is bit of a prototype, since support is limited to just a couple of types, but chosen so that extending functionality should be relatively easy.
So if anyone is interested in helping to make use of HPPC for data interchange easier, this is a project that could use help. Help here can mean all kinds of things: not just helping to complete it, but also to use it, provide feedback and so on.
Note, too, that support for other formats comes "for free", i.e. only one set of handlers are needed for container types; conversion happens at lower logical level.
-+ Tatu +-