Add support for Log4j2

[sdeleuze]

Add support for Log4j2

[sdeleuze]

I have linked the sample attached to the Log4j2 issue.

[sdeleuze]

I tried to provide support for this but have found a blocking issue, so I think native support for Log4j2 needs to happen directly on library side rather than here, see related comment on their bugtracker.

[sdeleuze]

Given the fact that Log4j2 needs to happen at least partially via builtin support, I think that's better to close this issue at least for now. Upcoming discussion should happen on https://issues.apache.org/jira/browse/LOG4J2-2649.

[darxriggs]

It might be useful to update the link to the "logging-log4j2" sample in the issue description to a version of the repository that still contains this sample (now that it has been removed).

[Periecle]

@sdeleuze I believe I have found a way to do that without changing anything into Log4j2. They need LambdaMetafactory thing to work around the Security Context switching issue. However, as Graal Native Image does not have a security manager - we do not need it, so I just replaced that class and excluded that part of the code via SVM Target/Substitute functionality. I verified my idea and provided a simple PoC for that. I have generated a basic reflect-config and manually edited it to support as many features as I could, but that is not a production-ready solution, and still, it works.

Here is my PoC. I am not sure we can merge such a thing in that repo(because of NativeServiceLoaderUtil).
https://github.com/Periecle/log4j2-native-tests

[CheneyWong]

--enable-url-protocols=http