Re: [rules-users] first steps with drools.....first errors

Hi Edison, I tried your suggestion but I received an exception when I pass a null value. The exception is: Exception in thread "main" java.lang.NullPointerException at java.math.BigDecimal.compareTo(BigDecimal.java:2461) at org.drools.base.evaluators.BigDecimalFactory$BigDecimalLessEvaluator.evaluate(BigDecimalFactory.java:235) at org.drools.rule.VariableRestriction.isAllowed(VariableRestriction.java:73) at org.drools.rule.VariableConstraint.isAllowed(VariableConstraint.java:67) at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:318) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:162) at org.drools.reteoo.Rete.assertObject(Rete.java:175) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:192) at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:911) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:883) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:684) I attach some file to test this. Thank you Nicola Edson Tirelli ha scritto: import ExamDetail; rule "Rule n.1" dialect "mvel" no-loop true salience 20 when exists ExamDetail( authLimit != null ); $examDetail : ExamDetail( $value: value < authLimit); then System.out.println( "Rule 1: exam PASSED!" + $value); end