NPE when calling PackageBuilder.addPackageFromDrl(Reader)

1. Set this classpath: http://eulergui.sourceforge.net/maven2/eulergui/eulergui/1.9-SNAPSHOT/eulergui-1.9-20110824.171234-1.jar The source is here , in case of need : http://eulergui.sourceforge.net/maven2/eulergui/eulergui/1.9-SNAPSHOT/eulergui-1.9-20110824.171234-1-sources.jar 2. Add this .drl file with PackageBuilder.addPackageFromDrl(Reader) package n3_project.helpers3 import n3_project.helpers.Triple; import n3_project.helpers.TripleList; import n3_project.helpers.TripleResult; import unif.TripleUser; import eulergui.inference.drools.impl.Assignment; import eulergui.inference.drools.impl.DeferredPropertyAssignment; import eulergui.inference.drools.impl.DeferredMethodCall; import eulergui.inference.drools.impl.DroolsN3EngineRuntime; import java.util.ArrayList; import java.util.Map; global Map / <Triple, Integer> / object2rule; rule "form-rules.n3 9" when $Triple_1 : Triple( $EVENT : subject, predicate == "< http://www.w3.org/1999/02/22-rdf-syntax-ns#type >", object == "< http://jmvanel.free.fr/ontology/gui_generic.owl#FocusLostEvent >" ) $Triple_2 : Triple( subject == $EVENT, predicate == "< http://jmvanel.free.fr/ontology/gui_generic.owl#eventSource >", $FIELD : object ) $Triple_3 : Triple( subject == $EVENT, predicate == "< http://jmvanel.free.fr/ontology/gui_generic.owl#newValue >", $VALUE : object ) Assignment( name == $EVENT, $EVENT_reference : reference, $JTEXT_FIELD : reference.source ) $Triple_4 : Triple( subject == $FIELD, predicate == "< http://jmvanel.free.fr/ontology/gui_generic.owl#inputWidgetSpecification >", $PREDICATE : object ) then Triple newTriple; TripleResult newTripleResult; newTriple = new Triple( ); newTriple.setSubject( $EVENT ); newTriple.setPredicate( "< http://jmvanel.free.fr/ontology/gui_generic.owl#consumed >".toString() ); newTriple.setObject( "true" ); insertLogical( newTriple ); String $RESOURCE = Triple.resource("RESOURCE") ; newTriple = new Triple( ); newTriple.setSubject( $RESOURCE ); newTriple.setPredicate( $PREDICATE.toString() ); newTriple.setObject( $VALUE ); insertLogical( newTriple ); newTriple = new Triple( ); newTriple.setSubject( $RESOURCE ); newTriple.setPredicate( "< http://jmvanel.free.fr/ontology/software_applications.owl#status >".toString() ); newTriple.setObject( "< http://jmvanel.free.fr/ontology/software_applications.owl#userData >" ); insertLogical( newTriple ); newTriple = new Triple( ); newTriple.setSubject( $FIELD ); newTriple.setPredicate( "< http://jmvanel.free.fr/ontology/gui_generic.owl#fieldSubject >".toString() ); newTriple.setObject( $RESOURCE ); insertLogical( newTriple ); System.out.println( "#TRACE ( " + "\"gui:FocusLostEvent new_value\"" + " " + $EVENT + " " + $FIELD + " " + "\" ?RESOURCE ?PREDICATE ?VALUE\"" + " " + "\" \"" + " " + $RESOURCE + " " + $PREDICATE + " " + $VALUE + " " + ")" ); DeferredPropertyAssignment dpa_GUIKBAdapter11 = new DeferredPropertyAssignment(); dpa_GUIKBAdapter11.setSubject("< http://jmvanel.free.fr/ontology/gui_generic.owl#GUIKBAdapter >".toString() ); dpa_GUIKBAdapter11.setPredicate( "< http://java.sun.com/method#setBoldFont >" ); dpa_GUIKBAdapter11.setObject($JTEXT_FIELD.toString() ); insert( dpa_GUIKBAdapter11 ); end