Hi All, I'm facing a problem when i have both *.drl and *.dsl. The following is the exception i'm facing. java.lang.IllegalArgumentException: Unable to use expander. Make sure a expander or dsl config is being passed to the parser. [ExpanderResolver was not set]. at org.drools.lang.RuleParser.expander(Unknown Source) at org.drools.lang.RuleParser.prolog(Unknown Source) at org.drools.lang.RuleParser.compilation_unit(Unknown Source) at org.drools.compiler.DrlParser.compile(Unknown Source) at org.drools.compiler.DrlParser.parse(Unknown Source) at org.drools.compiler.DrlParser.parse(Unknown Source) at org.drools.compiler.PackageBuilder.addPackageFromDrl(Unknown Source) at com.livetrial.CreditExample.main(CreditExample.java:24) Exception in thread "main" In the main java class, i have the below codes: builder.addPackageFromDrl( new InputStreamReader(CreditExample.class.getResourceAsStream("/credit.drl" )) ); builder.addPackageFromDrl( new InputStreamReader(CreditExample.class.getResourceAsStream("/credit.dsl" )) ); Please guide me on how to resolve this problem. Thanks Bindhu View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4172282#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...