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https://issues.apache.org/jira/browse/ARIES-1109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Ross updated ARIES-1109:
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Labels: nextreleasecandidate (was: )
> Consider making the persistence of AriesSubsystem-LastId more robust.
> ---------------------------------------------------------------------
>
> Key: ARIES-1109
> URL: https://issues.apache.org/jira/browse/ARIES-1109
> Project: Aries
> Issue Type: Bug
> Components: Subsystem
> Reporter: Stephan Siano
> Labels: nextreleasecandidate
> Attachments: a.esa, b.esa, c.esa
>
>
> Currently, AriesSubsystem-LastId is only persisted when the subsystems bundle
> is stopped. It will not be persisted, for example, when System.exit is called
> or some sort of crash occurs.
> There are at least three options.
> (1) Add a JVM shutdown hook.
> (2) Persist the last ID with each subsystem installation.
> (3) Periodically persist the last ID in a background thread (i.e. batch the
> installations).
> ---------------------------------------------------------------------------
> aries subsystems will generate duplicate subsystem ids if the subsystem core
> bundle (or the container) is restarted.
> Reproduction is quite easy:
> 1. install a subsystem -> this will get subsystem id 1
> 2. stop the org.apache.aries.subsystem.core bundle (or the OSGi container)
> 3. start the org.apache.aries.subsystem.core bundle (or the OSGi container)
> -> the subsystem installed in step 1 is still there and has id 1
> 4. Install another subsystem (different from the first)
> -> This will also get Id 1
> I think the error is in line 150 of the
> org.apache.subsystems.core.internal.Subsystems class. There the static lastId
> counter of the SubsystemIdentifier class is set to 0 before actually
> populating the root subsystem.
> Maybe this should be set to the maximum id of the installed subsystems during
> or after the population of the root subsystem
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