[ https://issues.jboss.org/browse/DROOLS-244?page=com.atlassian.jira.plugin... ] Vytautas Gimbutas commented on DROOLS-244: ------------------------------------------ If i move windows to accumulates directly I still experience the same issue. I hope that commit fixes for both window definition types. rule file to reproduce issue with windows inside accumulates: package rules; import java.math.BigDecimal; import test.Transaction; import test.TransactionCreatedEvent; import test.TransactionCompletedEvent; import org.drools.runtime.rule.RuleContext; declare TransactionCreatedEvent @role( event ) @expires( 183d ) @timestamp(created) end declare TransactionCompletedEvent @role( event ) @expires( 183d ) @timestamp(created) end rule transaction_count_over_last_day when $transaction : Transaction() $transactionCreatedEventCount : Number() from accumulate($tce : TransactionCreatedEvent() over window:time(1s) from entry-point "TransactionCreatedEventStream" , count($tce)) $transactionCompletedEventCount : Number() from accumulate($tce2 : TransactionCompletedEvent() over window:time(1s) from entry-point "TransactionCompletedEventStream" , count($tce2)) then System.out.println($transactionCreatedEventCount); System.out.println($transactionCompletedEventCount); end -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira