[jboss-jira] [JBoss JIRA] (JGRP-2193) View: use View.getCoord() to determine coordinator
Bela Ban created JGRP-2193:
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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}
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