I have following problem with null valuated string properties ------------------------------------------------------------- Key: JBRULES-854 URL: http://jira.jboss.com/jira/browse/JBRULES-854 Project: JBoss Rules Issue Type: Bug Security Level: Public (Everyone can see) Components: Reteoo Affects Versions: 4.0.0.MR2 Environment: Windows XP SP2 Reporter: Vesa Tuononen Assigned To: Mark Proctor Priority: Blocker I have very simple object with PropertyChangeSupport. Java code listed bellow object and test method: import java.beans.PropertyChangeListener; import java.beans.PropertyChangeSupport; import java.io.InputStreamReader; import org.drools.RuleBase; import org.drools.RuleBaseFactory; import org.drools.StatefulSession; import org.drools.compiler.DroolsParserException; import org.drools.compiler.PackageBuilder; public class OwnTest{ public static class Row{ private final PropertyChangeSupport changes = new PropertyChangeSupport( this ); private String field1; private String field2; public Row(){} public String getField1() { return field1; } public void setField1(String field1) { String oldField1 = this.field1; this.field1 = field1; this.changes.firePropertyChange( "field1", oldField1, this.field1 ); } public String getField2() { return field2; } public void setField2(String field2) { String oldField2 = this.field2; this.field2 = field2; this.changes.firePropertyChange( "field2", oldField2, this.field2 ); } public void addPropertyChangeListener(final PropertyChangeListener l) { this.changes.addPropertyChangeListener( l ); } public void removePropertyChangeListener(final PropertyChangeListener l) { this.changes.removePropertyChangeListener( l ); } } /** * @param args * @throws Exception * @throws DroolsParserException * @throws Exception */ public static void main(String[] args) throws Exception { Row r = new Row(); r.setField1(null); r.setField2(null); PackageBuilder builder = new PackageBuilder(); builder.addPackageFromXml(new InputStreamReader( OwnTest.class.getResourceAsStream("rule.xml"))); RuleBase ruleBase = RuleBaseFactory.newRuleBase(); ruleBase.addPackage( builder.getPackage() ); StatefulSession workingMemory = ruleBase.newStatefulSession(); workingMemory.assertObject(r, true); workingMemory.fireAllRules(); } } and rule.xml <?xml version="1.0" encoding="UTF-8"?> <package name="test" xmlns="http://drools.org/drools-3.0" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" xs:schemaLocation="http://drools.org/drools-3.0 drools-3.0.xsd"> <import name="OwnTest.Row"/> <rule name="1"> <lhs> <pattern object-type="Row"> <field-constraint field-name="field1"> <literal-restriction evaluator="==" value="1" /> </field-constraint> </pattern> </lhs> <rhs> System.out.println("--"+input.getField1()); input.setField1("2"); </rhs> </rule> <rule name="2"> <lhs> <pattern identifier="input" object-type="Row"> <field-constraint field-name="field1"> <literal-restriction evaluator="==" value="2" /> </field-constraint> </pattern> </lhs> <rhs> System.out.println("--"+input.getField1()); input.setField1("3"); </rhs> </rule> <rule name="3"> <lhs> <pattern identifier="input" object-type="Row"> <field-constraint field-name="field1"> <literal-restriction evaluator="==" value="3" /> </field-constraint> </pattern> </lhs> <rhs> System.out.println("--"+input.getField1()); input.setField1("4"); </rhs> </rule> <rule name="4"> <lhs> <pattern identifier="input" object-type="Row"> <field-constraint field-name="field1"> <literal-restriction evaluator="==" value="4" /> </field-constraint> </pattern> </lhs> <rhs> System.out.println("--"+input.getField1()); input.setField1("0"); input.setField2("5"); </rhs> </rule> <rule name="5"> <lhs> <pattern identifier="input" object-type="Row"> <field-constraint field-name="field2"> <literal-restriction evaluator="==" value="2" /> </field-constraint> </pattern> </lhs> <rhs> System.out.println("--"+input.getField1()); System.out.println("--"+input.getField2()); input.setField2("2b"); </rhs> </rule> </package> with this rule set I get following StackTrace: Exception in thread "main" java.lang.NullPointerException at org.drools.reteoo.CompositeObjectSinkAdapter$HashKey.setValue(CompositeObjectSinkAdapter.java:478) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:292) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:183) at org.drools.reteoo.Rete.assertObject(Rete.java:121) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:201) at org.drools.reteoo.ReteooWorkingMemory.doAssertObject(ReteooWorkingMemory.java:70) at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemory.java:724) at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemory.java:568) but if I remove some rules everything works fine. -- 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