sir, if you want to take any .drl file as an input of your JAVA program then you can try this code, final Reader source = new InputStreamReader( ClassExample.class.getResourceAsStream( "Class.drl" ) ); here ClassExample is corresponding JAVA program of your Class.drl file and ClassExample is your main class which contain main with regards, Niloy Debnath fakhfakh ismail <ismail_info2005(a)yahoo.fr&gt; wrote: Hello, First sorry for my bad english, I set all the class .java is in package hero.client.test and the file .drl is in folser Drl the call of file .drl InputStream in = DroolsTest.class.getResourceAsStream("Drl/Sample.drl"); but the problem is they didn't find the file .drl always an exception is affiched Exception in thread "main" java.lang.NullPointerException at java.io.Reader.<init>(Reader.java:61) at java.io.InputStreamReader.<init>(InputStreamReader.java:55) at org.drools.jsr94.rules.admin.LocalRuleExecutionSetProviderImpl.createRuleExecutionSet(Unknown Source) at hero.client.test.DroolsTest.main(DroolsTest.java:34) Please I need your help Best regards Ismail --------------------------------- Découvrez une nouvelle façon d'obtenir des réponses à toutes vos questions ! Profitez des connaissances, des opinions et des expériences des internautes sur Yahoo! Questions/Réponses._______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users --------------------------------- Check out what you're missing if you're not on Yahoo! Messenger