Re: [jgroups-users] ArrayIndexOutOfBounds exception in STABLE.installView()

Thanks Bela - I'll check out the CLEAR_VIEW option.  That would be a better workaround, I think.

> Le 6 juin 2017 à 23:49, Questions/problems related to using JGroups <[email protected]> a écrit :
> 
> I checked the code and changed all occurrences of view.getMembers().get(0) // or iterator.next() to View.getCoord(), as this wasn't much work.
> 
> Committed to master (will be 4.0.4)
> 
> [1] https://issues.jboss.org/browse/JGRP-2193
> 
>> On 05/06/17 23:51, Questions/problems related to using JGroups wrote:
>> Hi,
>> 
>> In Apache Geode I have a small protocol stack with no GMS where I manage
>> and install my own membership view into the channel. During one
>> transition I need to clear the view from the stack so I create a View
>> with no members and send it in a view-change to the channel.
>> Unfortunately STABLE isn't using View.getCoord() to get the current
>> membership coordinator and is using getMembers().get(0) instead, causing
>> an exception.
>> 
>>        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)
>> 
>> 
>> It seems like any use of View.getMembers().get(0) should be changed to
>> View.getCoord() and the code should be prepared to deal with a null
>> return value.
>> 
>> Bruce Schuchardt
>> 
>> 
>> ------------------------------------------------------------------------------
>> 
>> Check out the vibrant tech community on one of the world's most
>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>> _______________________________________________
>> javagroups-users mailing list
>> [email protected]
>> https://lists.sourceforge.net/lists/listinfo/javagroups-users
> 
> -- 
> Bela Ban | http://www.jgroups.org
> 
> 
> ------------------------------------------------------------------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> _______________________________________________
> javagroups-users mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/javagroups-users

------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
javagroups-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/javagroups-users