Bela Ban created JGRP-2193: ------------------------------ Summary: View: use View.getCoord() to determine coordinator Key: JGRP-2193 URL: https://issues.jboss.org/browse/JGRP-2193 Project: JGroups Issue Type: Bug Reporter: Bela Ban Assignee: Bela Ban Priority: Minor Fix For: 4.0.4 Often the coord is determined by getting a view's members and grabbing the first member of the view. If the list is empty, this fails with an NPE. Instead, use {{View.getCoord()}} and handle the potential null value. {noformat} ViewId vid = new ViewId(new JGAddress(), 0); List<Address> members = new ArrayList<>(); View jgv = new View(vid, members); this.myChannel.down(new Event(Event.VIEW_CHANGE, jgv)); java.lang.ArrayIndexOutOfBoundsException: 0 at java.util.Arrays$ArrayList.get(Arrays.java:3841) at java.util.Collections$UnmodifiableList.get(Collections.java:1309) at org.jgroups.protocols.pbcast.STABLE.handleViewChange(STABLE.java:365) at org.jgroups.protocols.pbcast.STABLE.down(STABLE.java:328) at org.jgroups.protocols.FlowControl.down(FlowControl.java:347) at org.jgroups.protocols.FlowControl.down(FlowControl.java:347) at org.jgroups.protocols.FRAG2.down(FRAG2.java:136) at org.jgroups.stack.ProtocolStack.down(ProtocolStack.java:1039) at org.jgroups.JChannel.down(JChannel.java:790) at org.apache.geode.distributed.internal.membership.gms.messenger.JGroupsMessenger.start(JGroupsMessenger.java:310) {noformat} -- This message was sent by Atlassian JIRA (v7.2.3#72005)