Hi, I am explaining the scenerio of recursion problem which I am facing. I have three rules in a ruleset. rule "gst_rate_ol" no-loop true salience 50 when QuoteUpdater:QuoteUpdater() eval(QuoteUpdater.getCustomerTypeCountry().equals("New Zealand") && QuoteUpdater.isFinanceLease() == true || QuoteUpdater.isRental() == true || QuoteUpdater.isOperatingLease() == true || QuoteUpdater.isHirePurchase() == true) then System.out.println("1"); TEMP = BigDecimal . valueOf ( 0.125 ) ; QuoteUpdater . setQuoteLevelGSTRate ( BigDecimal . valueOf ( TEMP . doubleValue ( ) ) ) ; modify(QuoteUpdater); end rule "NZ_SD" no-loop true salience 45 when QuoteUpdater:QuoteUpdater() eval(QuoteUpdater . getCustomerTypeCountry ( ).equals("New Zealand")) then System.out.println("2"); QuoteUpdater . setQuoteLevelGSTStreamRate ( BigDecimal . valueOf ( 0 ) ) ; QuoteUpdater . setQuoteLevelStampDutyRate ( BigDecimal . valueOf ( 0 ) ) ; GL_SD_Amt = BigDecimal . valueOf ( 0 ) ; QuoteUpdater . setQuoteLevelStampDutyAmount ( BigDecimal . valueOf ( 0 ) ) ; modify(QuoteUpdater); end rule "gst_stream_rate_ol" salience 40 no-loop true when QuoteUpdater:QuoteUpdater() eval(QuoteUpdater.getCustomerTypeCountry().equals("New Zealand") && QuoteUpdater.isRental() == true || QuoteUpdater.isOperatingLease() == true) then System.out.println("3"); TEMP = BigDecimal . valueOf ( 0.125 ) ; QuoteUpdater . setQuoteLevelGSTStreamRate ( BigDecimal . valueOf ( TEMP . doubleValue ( ) ) ) ; modify(QuoteUpdater); end while executing this ruleset a problem of recursion is occouring due to modify statement. To resolve this problem I have made some changes in drools code. I am explaining about the changes which I have made. some changes in following functions. Class: DefaultAgenda public boolean fireNextItem(final AgendaFilter filter) throws ConsequenceException { final AgendaGroupImpl group = (AgendaGroupImpl) getNextFocus(); // return if there are no Activations to fire if ( group == null ) {return false;} final AgendaItem item = (AgendaItem) group.getNext(); if ( item == null ) {return false;} item.getRule().setFired(true); if ( filter == null || filter.accept( item ) ) {fireActivation( item );} return true; } Class: TerminalNode public void assertTuple(final ReteTuple tuple,final PropagationContext context,final ReteooWorkingMemory workingMemory,final boolean fireActivationCreated) { // if the current Rule is no-loop and the origin rule is the same then // return if ( this.rule.getNoLoop() && this.rule.equals( context.getRuleOrigin() ) ) {return;} if(this.rule.isFired()) return; final InternalAgenda agenda = (InternalAgenda) workingMemory.getAgenda(); Class: Rule one attribute added name fired. (type boolean). By making these changes i am able to execute a rule single time only even whether there is any modify statement in rule. Please give your suggestion and feedback on this approach or avioding the recusrion problem. Thanks in advance. Kapil -- View this message in context: http://www.nabble.com/Recursion-problem-due-to-modify-an-object.-tf326558... Sent from the drools - user mailing list archive at Nabble.com.