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https://issues.apache.org/jira/browse/QPID-1128?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Gemmell updated QPID-1128:
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Attachment: QPID-1128_23nov2008.patch
This issue occurs because the queue items are stored in a map created in the
abstract MBeanTypeTabControl class by a method within the QueueTypeTabControl
subclass, using a key consisting of their name and the queue depth. The first
issue is that this results in the sort by name list also having the items queue
depths, and the second is that it results in an NPE when attempting to add
queues when they are sorted by consumer count. This occurs because the items
are then requested back from the map by a method in MBeanTypeTabControl with a
key which now consists of their name and consumer count due to the resorting
altering the displayed list items which are utilised as keys, and this results
in it returning null.
The attached patch QPID-1128_23nov2008.patch corrects this issue by altering
the QueueTypeTabControl class to use only the queue name when inserting the
queues into the map, and to display the appropriate data (name only, name +
queue depth, or name + consumer count) in the selection list. Additionally it
modifies MBeanTypeTabControl to ensure it utilises only the name from the keys
passed to its method which adds to the navigation by having it strip everything
from the first occurance of the string " (", which only occurs after the name.
> NPE displayed when adding queue to navigation
> ---------------------------------------------
>
> Key: QPID-1128
> URL: https://issues.apache.org/jira/browse/QPID-1128
> Project: Qpid
> Issue Type: Bug
> Components: Java Management : JMX Console
> Affects Versions: M2, M2.1
> Reporter: Martin Ritchie
> Assignee: Martin Ritchie
> Attachments: QPID-1128_23nov2008.patch
>
>
> Summary:
> If you sort the queues on a Virtualhost by 'Consumer count' and then proceed
> to '<- Add to Navigation' then it will fail and a box stating 'Manged Object
> is null : NPE' will be displayed.
> Workaround:
> Ensure that 'Consumer count' is not the chosen 'Sort by' value.
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