[ https://issues.jboss.org/browse/DROOLS-546?page=com.atlassian.jira.plugin... ] Davide Sottara updated DROOLS-546: ---------------------------------- Description: *WARNING : the committed fix does not implement the behavior intended by the title or description : the code now simply ignore without any error the unknown field* [EDIT: I have updated the title to reflect the original problem, not the proposed solution(s). After the discussion below, we decided to prevent the NPE but not to throw a different exception. The KieBase.getFactType( String pkg, String name ) will return null in case the fact type is not defined. The client can do a null check to determined whether the type is valid or not. --Davide] factType.get(instance, "unknownField") is currently throwing an NPE. This gives improper information to the user/developper. I propose that it throws a new UnknownFactFieldException giving improved information giving good hints for debugging or enabling specific exception management. See pull request for test-case and proposed fix was: *WARNING : the committed fix does not implement the behavior intended by the title or description : the code now simply ignore without any error the unknown field* factType.get(instance, "unknownField") is currently throwing an NPE. This gives improper information to the user/developper. I propose that it throws a new UnknownFactFieldException giving improved information giving good hints for debugging or enabling specific exception management. See pull request for test-case and proposed fix -- This message was sent by Atlassian JIRA (v6.3.1#6329)