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Steps to Reproduce:

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Run this code :
https://eulergui.svn.sourceforge.net/svnroot/eulergui/trunk/eulergui/src/test/java/samples/DroolsSample.java

and look at method tripleTestEval()

with this library :
http://eulergui.sourceforge.net/maven2/eulergui/eulergui/1.9-SNAPSHOT/eulergui-1.9-20110824.171234-1.jar

If needed , auxiliary sources are also here :
http://eulergui.sourceforge.net/maven2/eulergui/eulergui/1.9-SNAPSHOT/

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Run this code : https://eulergui.svn.sourceforge.net/svnroot/eulergui/trunk/eulergui/src/test/java/samples/DroolsSample.java and look at method tripleTestEval() with this library : http://eulergui.sourceforge.net/maven2/eulergui/eulergui/1.9-SNAPSHOT/eulergui-1.9-20110824.171234-1.jar If needed , auxiliary sources are also here : http://eulergui.sourceforge.net/maven2/eulergui/eulergui/1.9-SNAPSHOT/

Scenario :

It works for most cases, BUT when the LHS has an eval like this it fails:

when
Triple( subject == "<a>" , $x : object )
eval( Double.parseDouble( $x ) > 5 )

inserting fact before populating rule base => rule does not fire, because of eval()