[rules-users] Fw: [drools-user] identity vs equality question - drools use of equals()

[guillaume.tardif at sgcib.com]

Hi,

I have a similar problem when using objects from an external framework as 
facts : the equals method is invoked despite using the 
WM_BEHAVIOR_IDENTITYproperty.

Here is an exmple reproducing this with JBoss Rules 3.0.5 : I have created 
a JBoss Rules project under Eclipse, and created 2 classes MyObject and 
MyObject2. 
These classes have hashCode() returning 0 and equals throwing a 
ClassCastException when comparing 2 object of different classes



Actually, after debugging a bit, it seems that  the equals method is 
invoked by the TruthMaintenanceSystem.assertMap, which has a hardcoded 
EqualityKeyComparator (never set to IdentityKeyComparator). 
The WorkingMemory.assertMap has its KetComparator set correctly to 
IdentityKeyComparator
Also, the equals method is not called when the hashCode() method returns 
different values for different objects, which makes it a bit harder to 
reproduce the issue.

This is a roadblock for using JBoss Rules in our context ; has someone any 
idea for a workaround?

Thanks in advance,
Guillaume
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