<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><span style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); ">What is the purpose of </span><span style="background-color: rgb(240, 240, 240); font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; ">RightTupleIndexHashTable?</span></div><div><font face="Arial, FreeSans, Helvetica, sans-serif"><span style="font-size: 13px; line-height: 17px;">We are getting the exception below but unable to come up with a self contained unit test to demonstrate the problem.</span></font></div><div><font face="Arial, FreeSans, Helvetica, sans-serif"><span style="font-size: 13px; line-height: 17px;"><br></span></font></div><span style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); ">Caused by: java.lang.NullPointerException: null</span><br style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); "><span style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); ">at org.drools.core.util.index.RightTupleIndexHashTable.removeAdd(RightTupleIndexHashTable.java:344) ~</span><span class="error" style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); ">[drools-core-5.5.0.Final.jar:5.5.0.Final]</span><br style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); "><span style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); ">at org.drools.reteoo.JoinNode.modifyRightTuple(JoinNode.java:224) ~</span><span class="error" style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); ">[drools-core-5.5.0.Final.jar:5.5.0.Final]</span><br style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); "><span style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); ">at org.drools.reteoo.PropagationQueuingNode$ModifyToSinkAction.execute(PropagationQueuingNode.java:513) ~</span><span class="error" style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); ">[drools-core-5.5.0.Final.jar:5.5.0.Final]</span><br style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); "><span style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); ">at org.drools.reteoo.PropagationQueuingNode.propagateActions(PropagationQueuingNode.java:280) ~</span><span class="error" style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); ">[drools-core-5.5.0.Final.jar:5.5.0.Final]</span><br style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); "><span style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); ">at org.drools.reteoo.PropagationQueuingNode$PropagateAction.execute(PropagationQueuingNode.java:588) ~</span><span class="error" style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); ">[drools-core-5.5.0.Final.jar:5.5.0.Final]</span><br style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); "><span style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); ">at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:993) </span><span class="error" style="font-family: Arial, FreeSans, Helvetica, sans-serif; font-size: 13px; line-height: 17px; background-color: rgb(240, 240, 240); ">[drools-core-5.5.0.Final.jar:5.5.0.Final]</span></body></html>