[jira] [Created] (TAP5-2154) Environment keys with empty associated stacks should not be listed as available

["Jochen Kemnade (JIRA)" <ji...@apache.org>]

Jochen Kemnade created TAP5-2154:
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             Summary: Environment keys with empty associated stacks should not be listed as available
                 Key: TAP5-2154
                 URL: https://issues.apache.org/jira/browse/TAP5-2154
             Project: Tapestry 5
          Issue Type: Bug
          Components: tapestry-core
    Affects Versions: 5.4
            Reporter: Jochen Kemnade
         Attachments: 0001-don-t-list-environment-keys-with-empty-stacks.patch

I just got the confusing error message:

No object of type org.apache.tapestry5.services.Heartbeat is available from the Environment.
Available values:
 * org.apache.tapestry5.services.Heartbeat
..

That happened because Heartbeat had been pushed and popped during the render cycle. The problem is, that Heartbeat is still a key in the map of available objects, but the list/stack of associated objects is empty.
The patch removes entries removes those keys from the AvailableValues values list.

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