[jira] [Commented] (LOG4J2-2604) Generate reflect-config.json for GraalVM during annotation processing

["Ralph Goers (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LOG4J2-2604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16990349#comment-16990349 ] 

Ralph Goers commented on LOG4J2-2604:
-------------------------------------

In looking over the details of this I am not in favor of trying to get the release-2.x branch to be compatible with GraalVM and we should only do this work on master.  I agree we will need to modify the annotation processor to generate the reflect-config.json files. 

> Generate reflect-config.json for GraalVM during annotation processing
> ---------------------------------------------------------------------
>
>                 Key: LOG4J2-2604
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-2604
>             Project: Log4j 2
>          Issue Type: New Feature
>          Components: Configurators
>            Reporter: Remko Popma
>            Priority: Major
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> See [https://github.com/oracle/graal/issues/1209] and [https://github.com/oracle/graal/issues/808]
> Currently log4j2 cannot be used in GraalVM native images because it uses reflection. 
> Graal SubstrateVM can [deal with reflection|https://github.com/oracle/graal/blob/master/substratevm/REFLECTION.md] when it’s clear to the AOT compiler what classes, methods and fields are reflected on. The log4j plugin mechanism is too dynamic for the automatic reflection analysis.
> This can be solved by providing a {{reflect-config.json}} configuration file, which may be embedded in the jar under {{META-INF/native-image/some/path/}}.
> The annotation processor is the natural place to generate this configuration file, so that applications that provide custom Log4j components will have the necessary {{META-INF/native-image/org/apache/logging/log4j/core/config/plugins/reflect-config.json}} to accompany their {{META-INF/org/apache/logging/log4j/core/config/plugins/Log4j2Plugins.dat}} file in their jar.



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