When globals are used in a lhs of a rule, you cannot create a new working memory -------------------------------------------------------------------------------- Key: JBRULES-907 URL: http://jira.jboss.com/jira/browse/JBRULES-907 Project: JBoss Rules Issue Type: Bug Security Level: Public (Everyone can see) Affects Versions: 3.0.6 Environment: JDK 1.5.0 under Windows XP Reporter: Krishnan Sivaramakrishna Iyer Assigned To: Mark Proctor Priority: Blocker Fix For: 3.0.6 Rule file #created on: May 16, 2007 package com.sample #list any import classes here. import com.sample.Line; #declare any global variables here global Line newLine; rule "Generate new object line" when eval (newLine.getLine().equals("")) then System.out.println("This is an empty line."); end /** * */ package com.sample; import java.lang.String; /** * @author kiyer * */ public class Line { private String line; public Line(String line) { setLine(line); } /** * @return the line */ public String getLine() { return line; } /** * @param line the line to set */ public void setLine(String line) { this.line = line; } } In the main program, call the following final RuleBase ruleBase = readRule(); final WorkingMemory session = ruleBase.newWorkingMemory(); You will see the following exception org.drools.RuntimeDroolsException: java.lang.NullPointerException at org.drools.rule.EvalCondition.isAllowed(Unknown Source) at org.drools.reteoo.EvalConditionNode.assertTuple(Unknown Source) at org.drools.reteoo.LeftInputAdapterNode.createAndAssertTuple(Unknown Source) at org.drools.reteoo.LeftInputAdapterNode.assertObject(Unknown Source) at org.drools.reteoo.ObjectSource.propagateAssertObject(Unknown Source) at org.drools.reteoo.ObjectTypeNode.assertObject(Unknown Source) at org.drools.reteoo.Rete.assertObject(Unknown Source) at org.drools.reteoo.ReteooRuleBase.assertObject(Unknown Source) at org.drools.reteoo.ReteooRuleBase.newWorkingMemory(Unknown Source) at org.drools.common.AbstractRuleBase.newWorkingMemory(Unknown Source) at com.sample.CfiTest.main(CfiTest.java:24) Caused by: java.lang.NullPointerException at com.sample.Rule_Generate_new_object_line_0.eval0(Rule_Generate_new_object_line_0.java:10) at com.sample.Rule_Generate_new_object_line_0Eval0Invoker.evaluate(Rule_Generate_new_object_line_0Eval0Invoker.java:18) ... 11 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