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https://issues.apache.org/jira/browse/FELIX-2324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12863884#action_12863884
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Richard S. Hall commented on FELIX-2324:
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ok. Well, all I am thinking about doing is adding some property substitution 
magic in the default.properties file that ships with the framework so that it 
tries to select a default value based on the JRE. This shouldn't be 
problematic, since anyone will be able to override it by specifying the 
property explicitly in the framework configuration properties. Just like we do 
currently for system packages.

> Support execution environment so that OBR works properly
> --------------------------------------------------------
>
>                 Key: FELIX-2324
>                 URL: https://issues.apache.org/jira/browse/FELIX-2324
>             Project: Felix
>          Issue Type: Improvement
>          Components: Framework
>    Affects Versions: framework-2.0.5
>            Reporter: Christopher Blunck
>            Priority: Minor
>             Fix For: framework-3.0.0
>
>
> Basic use case here is that I'd like to use Jackson within OBR.  Jackson 
> expresses a requirement on ee=J2SE-1.5.  Felix Karaf doesn't have a facility 
> for supported execution environments.
> I can set:
>   JAVA_OPTS="-Dorg.osgi.framework.executionenvironment=J2SE-1.5" 
> before I start karaf from the command line but this seems like a hack.  It's 
> very possible that I'll start Karaf using Sun's 1.6 JVM or an IBM JVM.
> Ideally at startup time Karaf could look at the runtime and determine the JVM 
> version (at the very least).  It could then expose the execution environment 
> somehow (presumably in a way that OBR would understand).
> We should still be able to explicitly set the 
> org.osgi.framework.executionenvironment system property but ideally it'd be 
> additive to the ee's that Karaf senses when it starts up.

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