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https://issues.apache.org/jira/browse/STANBOL-1239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13850502#comment-13850502
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Rupert Westenthaler commented on STANBOL-1239:
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note a further revert with rev. 1551554
> EngineTracker and ChainTracker should lazily start tracking
> -----------------------------------------------------------
>
> Key: STANBOL-1239
> URL: https://issues.apache.org/jira/browse/STANBOL-1239
> Project: Stanbol
> Issue Type: Improvement
> Reporter: Rupert Westenthaler
> Assignee: Rupert Westenthaler
> Priority: Minor
>
> In the trunk version there are some NPE caused by the OSGI service factory
> returning null. This is cause by ServiceTrackers that are opened within the
> activate method. While those NPE do not have any functional consequences
> (OSGI is catching them and will repeat calls to addService(..) later on) they
> can be easily avoided by only start tracking on the first request to the
> EngineTracker and ChainTracker methods.
> NOTE: this only affects the trunk and does not appear in 0.12
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