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https://issues.apache.org/jira/browse/PROTON-1393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15864676#comment-15864676
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ASF GitHub Bot commented on PROTON-1393:
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Github user jkamke closed the pull request at:
https://github.com/apache/qpid-proton-j/pull/2
> Memory leak with delayed settlement
> -----------------------------------
>
> Key: PROTON-1393
> URL: https://issues.apache.org/jira/browse/PROTON-1393
> Project: Qpid Proton
> Issue Type: Bug
> Components: proton-j
> Affects Versions: 0.16.0, 0.17.0
> Reporter: Jonathan Kamke
>
> {{DeliveryImpl}} manages several doubly linked lists (of links, work and
> transportWork). However it does not function properly if removal is done out
> of order. It leaves object references in the next/previous pointers which on
> a large scale inhibit the system from garbage collecting these object, namely
> the {{DeliveryImpl}} object graph.
> In practice this was discovered when message consumers delay settlement of
> messages until after a period of time elapses (i.e. some async work is done
> in another thread). This causes out of order settlement to occur, leaving
> object references. Eventually the JVM will run out of memory and the process
> will crash. The heap can be examined to discover a large number of
> {{settled}} {{DeliveryImpl}}(s) which are holding references to themselves.
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