Do you mean share in real time or do you mean using statics? Statics will ha
ve trouble because of class loader issues although by keeping the objects in
 a utility jar on a common class path then you may be able to share them.

If you mean in a cluster then something like ObjectGrid will let you share s
tate between instances/applications without the need to even share classes, 
each application can use a different POJO for the same state.

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