THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Detachable Models
Stateful vs Stateless
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Beware ...
Non-static inner classes
Non-static inner classes can access the state of the enclosing object. To do this, the byte code of the inner-class contains a reference to the outer-class instance. So, when the inner-class instace is serialised, the outer-class instance will be serialised too!