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https://issues.apache.org/jira/browse/ARTEMIS-2923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17204193#comment-17204193
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Justin Bertram commented on ARTEMIS-2923:
-----------------------------------------
The recommendation at this point would be to _not_ use colocation. It will be
deprecated soon. See [this
thread|http://activemq.2283324.n4.nabble.com/DISCUSS-Deprecate-colocated-configuration-in-Artemis-td4754946.html]
on the developer mailing list for more details on that.
If you've got a real use-case where this fails _without_ colocation then let me
know.
> Configuration plugins are not serializable and cause replication to fail
> ------------------------------------------------------------------------
>
> Key: ARTEMIS-2923
> URL: https://issues.apache.org/jira/browse/ARTEMIS-2923
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Components: Broker
> Affects Versions: 2.15.0
> Reporter: Aaron Steigerwald
> Priority: Major
> Attachments: broker.xml.server0, broker.xml.server1
>
>
> The org.apache.activemq.artemis.core.config.impl.ConfigurationImpl.copy()
> method fails to serialize plugin list members containing one or more elements.
> This can be demonstrated using the
> examples\features\ha\colocated-failover-scale-down example. In each
> broker.xml file, change the <ha-policy><shared-store> element to
> <ha-policy><replication> (also remove the <failover-on-shutdown> element) and
> add the NotificationActiveMQServerPlugin from
> [https://activemq.apache.org/components/artemis/documentation/latest/broker-plugins.html:]
> {noformat}
> <broker-plugins>
> <broker-plugin
> class-name="org.apache.activemq.artemis.core.server.plugin.impl.NotificationActiveMQServerPlugin">
> <property key="SEND_CONNECTION_NOTIFICATIONS" value="true" />
> <property key="SEND_SESSION_NOTIFICATIONS" value="true" />
> </broker-plugin>
> </broker-plugins>{noformat}
> Modified broker.xml files for the
> examples\features\ha\colocated-failover-scale-down example are attached.
> The following exception is generated:
> {noformat}
> ColocatedFailoverScaleDownExample0-out:2020-09-29 17:22:31,917 WARN
> [org.apache.activemq.artemis.core.server] AMQ222261: Failed to activate a
> backup: java.security.PrivilegedActionException:
> java.io.NotSerializableException:
> org.apache.activemq.artemis.core.server.plugin.impl.NotificationActiveMQServerPlugin{noformat}
> Two options exist for fixing this:
> 1) Implement the Serializable interface in all affected plugin classes.
> 2) Make all org.apache.activemq.artemis.core.config.impl.ConfigurationImpl
> plugin list members transient and NOT final, create setters for them, and
> manually copy the plugin lists after serialization in the
> org.apache.activemq.artemis.core.config.impl.ConfigurationImpl.copy() method
> like so:
> {noformat}
> // Manually copy all plugins because they have been defined as
> transient due to many classes in their hierarchy not implementing the
> Serializable interface.
> ((ConfigurationImpl) config).setBrokerPlugins(new
> CopyOnWriteArrayList<>(ConfigurationImpl.this.getBrokerPlugins()));
> ((ConfigurationImpl) config).setBrokerConnectionPlugins(new
> CopyOnWriteArrayList<>(ConfigurationImpl.this.getBrokerConnectionPlugins()));
> ((ConfigurationImpl) config).setBrokerSessionPlugins(new
> CopyOnWriteArrayList<>(ConfigurationImpl.this.getBrokerSessionPlugins()));
> ((ConfigurationImpl) config).setBrokerConsumerPlugins(new
> CopyOnWriteArrayList<>(ConfigurationImpl.this.getBrokerConsumerPlugins()));
> ((ConfigurationImpl) config).setBrokerAddressPlugins(new
> CopyOnWriteArrayList<>(ConfigurationImpl.this.getBrokerAddressPlugins()));
> ((ConfigurationImpl) config).setBrokerQueuePlugins(new
> CopyOnWriteArrayList<>(ConfigurationImpl.this.getBrokerQueuePlugins()));
> ((ConfigurationImpl) config).setBrokerBindingPlugins(new
> CopyOnWriteArrayList<>(ConfigurationImpl.this.getBrokerBindingPlugins()));
> ((ConfigurationImpl) config).setBrokerMessagePlugins(new
> CopyOnWriteArrayList<>(ConfigurationImpl.this.getBrokerMessagePlugins()));
> ((ConfigurationImpl) config).setBrokerBridgePlugins(new
> CopyOnWriteArrayList<>(ConfigurationImpl.this.getBrokerBridgePlugins()));
> ((ConfigurationImpl) config).setBrokerCriticalPlugins(new
> CopyOnWriteArrayList<>(ConfigurationImpl.this.getBrokerCriticalPlugins()));
> ((ConfigurationImpl) config).setBrokerFederationPlugins(new
> CopyOnWriteArrayList<>(ConfigurationImpl.this.getBrokerFederationPlugins()));
> ((ConfigurationImpl) config).setBrokerResourcePlugins(new
> CopyOnWriteArrayList<>(ConfigurationImpl.this.getBrokerResourcePlugins()));
> {noformat}
>
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