In your beans Do you use caps for attributes ? - CTO @ <http://www.plugtree.com>http://www.plugtree.com - MyJourney @ <http://salaboy.wordpress.com>http://salaboy.wordpress.com - Co-Founder @ <http://www.jbug.com.ar>http://www.jbug.com.ar - Mauricio "Salaboy" Salatino - On 13/10/2010, at 22:20, sumatheja <sumatheja(a)gmail.com&gt; wrote: Hi All, I have this doubt regarding the notation used inside the rule's condition. I have a fact HOST having the variables* HostName* and * CPUSockets*. I have the following rule rule "Test" when HOST(HostName!=null, CPUSockets>3) then # do something Is throws an error saying cannot extract field *HostName*. It works fine when i use *hostName*. Can anyone explain me the concept behind this. Thanks in advance :) -- cheers Sumatheja Dasararaju _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users