Arun V G [https://community.jboss.org/people/arunvg] created the discussion "Re: How to validate process definitions , before creating the Knowledge base object" To view the discussion, visit: https://community.jboss.org/message/718210#718210 -------------------------------------------------------------- In the latest source available in github the KnowledgeBuilder interface have a method undo { https://github.com/droolsjbpm/droolsjbpm-knowledge/blob/master/knowledge-... https://github.com/droolsjbpm/droolsjbpm-knowledge/blob/master/knowledge-... So that it looks like  I can implement my use case as below kbuilder.add(ResourceFactory.newByteArrayResource(processFile), ResourceType.BPMN2);             if(kbuilder.hasErrors()){                 /** * Remove the last added Resource. * Can be useful in case this last addition generated some compilation problem. * If multiple Resources have been added in batch using a CompositeKnowledgeBuilder, * it removes all of them.                 */                 kbuilder.undo();             } But unfortunately I think the  version  included with JBPM5.2  doesn't have this method (  knowledge-api-5.3.1.Final.jar )  . In my work environment I am not allowed to work with an unreleased (latest) version :(( .Does anyone know a workaround. Cheers :) -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/718210#718210] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]