Consider the following: I have a shadow fact based on a java class Vehicle, which has a property position which has a compound (class) type Position, containing the position coordinates. Now I want to notify Jess of a position update. This has to be done at the Position level, since it is meaningless to handle the individual coordinate updates in isolation. Changing x without the y will usually place the Vehicle at a place where it never was or will be, or even can be. My approach to this is to do a firePropertyChange on the position property with a 'null' oldValue. This seems to be acceptable JavaBeans practice. However, it does not work in Jess. Jess tries to figure out by itself that since the position property is still the same object, it may safely assume that the content has not changed. It never considers the oldValue I provided. I see tow solutions: either create a new Position object on every position update, to replace the old one, or add some sort of positionModified attribute slot. I don't particularly like either of them. I would appreciate it if you could consider supporting the JavaBeans approach.
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