[jboss-jira] [JBoss JIRA] Commented: (JBRULES-1572) sometimes getting ClassFieldExtractor error

[ http://jira.jboss.com/jira/browse/JBRULES-1572?page=comments#action_12410154 ] Ming Fang commented on JBRULES-1572: ------------------------------------ It looks like this is due to a rule being fired at the wrong time Here is the rule with details removed for clarity..ignore most of it except for model and how it is retracted at the end. rule "Quote" when model:ModelValue() ... then ... insert(bidQuote); insert(askQuote); retract(model); end Now where is the events that leads to this error. Note the rule fired, retracted model and then somehow got fired again but this time model has already been retracted. [4/23 00:19:18 com.ml.ax.drools.AXRules$2.beforeActivationFired]INFO: [BeforeActivationFired: rule=Quote; tuple=[fact fid:7919:20161:ModelValue{}] ] [4/23 00:19:18 com.ml.ax.drools.AXRules$1.objectInserted]INFO: [ObjectInserted: handle=[fact fid:8081:20587:Quote{ }]; object=Quote{}] [4/23 00:19:18 com.ml.ax.drools.AXRules$1.objectInserted]INFO: [ObjectInserted: handle=[fact fid:8082:20588:Quote{ }]; object=Quote{}] [4/23 00:19:18 com.ml.ax.drools.AXRules$1.objectRetracted]INFO: [ObjectRetracted: handle=[fact fid:7919:20161:ModelValue{}]; old_object=ModelValue{}] [4/23 00:19:18 com.ml.ax.drools.AXRules$2.beforeActivationFired]INFO: [BeforeActivationFired: rule=Quote; tuple=[[fact fid:-1:20161:null]] [4/23 00:19:18 com.ml.ax.AXSystem$3.run]WARNING: org.drools.spi.ConsequenceException: java.lang.NullPointerException: org.drools.spi.ConsequenceException: java.lang.NullPointerException at org.drools.base.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:24) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:590) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:550) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:527) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:491) at com.ml.ax.drools.AXRules.fireAllRules(AXRules.java:161) at com.ml.ax.AXSystem$3.run(AXSystem.java:348) Caused by: java.lang.NullPointerException at org.drools.base.com.ml.ax.ModelValue14866295$getModelValue.getDoubleValue(Unknown Source) at org.drools.base.ClassFieldExtractor.getDoubleValue(ClassFieldExtractor.java:191) at org.drools.rule.Declaration.getDoubleValue(Declaration.java:281) at com.ml.ax.drools.Rule_Quote_0ConsequenceInvoker.evaluate(Unknown Source) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:586) ... 5 more -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://jira.jboss.com/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira