Michael, There is a java class named Process in java.lang package. As java imports all java.lang classes automatically, you will need to fully qualify your class name in this case. rule "A rule" when p:com.ford.nges.om.Process( ) then System.out.println(p.toString()); end I didn't test that, but shall work. []s Edson Anstis, Michael (M.) wrote: > Hi, > > I have a simple rule that references a "Process" fact:- > > package com.ford.nges.jboss.rules > > import com.ford.nges.om.Constants > import com.ford.nges.om.Component > import com.ford.nges.om.ResourceEntry > import com.ford.nges.om.Process > import com.ford.nges.om.Machine > > rule "A rule" > when > p:Process( ) > then > System.out.println(p.toString()); > end > > However I receive the following error on > builder.addPackageFromDrl(new > InputStreamReader(Main.class.getResourceAsStream("rules.drl"))); even > though I have an import statement. > > Exception in thread "main" java.lang.Error: Unable to find > unambiguously defined class 'Process', candidates are: > [java.lang.Process, com.ford.nges.om.Process] > > at > org.drools.semantics.java.ClassTypeResolver.resolveType(Unknown > Source) > at org.drools.semantics.java.RuleBuilder.build(Unknown > Source) > at org.drools.semantics.java.RuleBuilder.build(Unknown > Source) > at org.drools.semantics.java.RuleBuilder.build(Unknown > Source) > at org.drools.compiler.PackageBuilder.addRule(Unknown > Source) > at org.drools.compiler.PackageBuilder.addPackage(Unknown > Source) > at > org.drools.compiler.PackageBuilder.addPackageFromDrl(Unknown > Source) > at com.ford.nges.Main.main(Main.java:43) > > If "Process" is referred to in the RHS or the Class name is not > Process I don't get the error. > > Any thoughts? > > With kind regards, > > Michael Anstis > ------------------------------------------- > *Next Generation Estimating System* > ( Trafford House (Int) 8 718 2239 > ( Trafford House (Ext) +44 (0)1268 702239 > * <_mailto:manstis1@ford.com_> > > > ------------------------------------------------------------------------ > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > >