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https://issues.apache.org/jira/browse/AMQ-9376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17784443#comment-17784443
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ASF subversion and git services commented on AMQ-9376:
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Commit 19696254dddf169fa62d502a53fa0351bad3d080 in activemq's branch
refs/heads/main from Matt Pavlovich
[ https://gitbox.apache.org/repos/asf?p=activemq.git;h=19696254d ]
[AMQ-9376] Fix ConcurrentModificationException during a destroy()
> Fix concurrent modification in ActiveMQServiceFactory
> -----------------------------------------------------
>
> Key: AMQ-9376
> URL: https://issues.apache.org/jira/browse/AMQ-9376
> Project: ActiveMQ
> Issue Type: Bug
> Reporter: Matt Pavlovich
> Assignee: Matt Pavlovich
> Priority: Minor
> Fix For: 6.0.0, 5.18.4, 5.17.7
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Need a class instance level lock or duplicate list around the broker map when
> doing a .destroy() caused by bundle refesh
> Calling .destroy() loops over a map which calls deleted.. which fails when
> there is more than one bundle and the bundle is shutdown first (not a
> service(s) removed via .cfg delete or osgi service shutdown lifecycle).
> #1. OSGi calls..
> {noformat}
> synchronized public void destroy() {
> for (String broker : brokers.keySet()) {
> deleted(broker);
> }
> }
> {noformat}
> #2. Which blows up here.. due to concurrent modification on the _brokers_
> collection
> {noformat}
> @Override
> synchronized public void deleted(String pid) {
> ServiceRegistration<BrokerService> reg = brokerRegs.remove(pid);
> if (reg != null) {
> reg.unregister();
> }
> BrokerService broker = brokers.remove(pid);
> if (broker != null) {
> stop(pid, broker);
> }
> }
> {noformat}
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