I'm trying to formulate a condition like: package com.sample import org.hibernate.Session; import com.sample.entity.TempEntity; global java.util.List myGlobalList; rule "Hello World" when $hibernateSession : Session(); $tmp1 :TempEntity($bin1 :bin) from $hibernateSession.createQuery("from TempEntity").list() $tmp2 : TempEntity($bin2 : bin) from myGlobalList //eval($bin == ((TempEntity)(myGlobalList.get(0))).getBin()) eval($bin1 == $bin2) then System.out.println("success"); end I'm trying to find an Entity by bin from DB. there is only one entity in the "myGlobalList". NO complie error but it shows the following: log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment). log4j:WARN Please initialize the log4j system properly. Hibernate: select tempentity0_.bin as bin0_, tempentity0_.bank_name as bank2_0_, tempentity0_.bank_id as bank3_0_, tempentity0_.card_name as card4_0_, tempentity0_.card_length as card5_0_, tempentity0_.card_type as card6_0_ from bin tempentity0_ what should I do if i want this rule works? -- View this message in context: http://www.nabble.com/Why-this-rule-did%27t-work--tp25218669p25218669.html Sent from the drools - user mailing list archive at Nabble.com.