You shouldn't really access the ProcessBuilder directly anymore, we've added support in the PackageBuilder for that (similar to rules, decision tables, etc.): PackageBuilder.addRuleFlow(Reader) If you want to access ProcessBuilder directly, you can just provide an empty PackageBuilder, but it seems unlikely that you don't want to add any rules, as the ruleflows main purpose is to manage the evaluation of rulesets. The ProcessBuilder requires access to a PackageBuilder as it internally also uses rules to control the ruleflow process execution. Kris ----- Original Message ----- From: "hypnosat7" <ablarbi(a)yahoo.fr&gt; To: <rules-users(a)lists.jboss.org&gt; Sent: Thursday, July 26, 2007 2:49 PM Subject: [rules-users] processBuilder constructor