[MS22] Native Compilation Support #2

[ppkarwasz]

This is the second milestone, after #2830, devoted to fixing GraalVM support in Log4j.

Tasks

• Fix GraalVM support in log4j-core (Add reachability-metadata.json to all Log4j modules #3053).
• Document how to use GraalVM with Log4j Core (Document GraalVM usage with Log4j #3054).

[ppkarwasz]

I have merged #3053 and CI build 11178890775 confirms that all the Log4j API backends work with GraalVM out-of-the-box.

Note: third-party backends such as java.util.logging and Logback require an extra injection of external metadata.
On the other hand our backends Simple Logger and Log4j Core work out-of-the-box with this native-maven-plugin configuration:

      <plugin>
        <groupId>org.graalvm.buildtools</groupId>
        <artifactId>native-maven-plugin</artifactId>
        <version>0.10.3</version>
        <extensions>true</extensions>
        <configuration>
          <mainClass>org.apache.logging.log4j.samples.graalvm.Main</mainClass>
          <!-- Not strictly necessary, but we want to make sure that external metadata sources are not used -->
          <metadataRepository>
            <enabled>false</enabled>
          </metadataRepository>
        </configuration>
        <executions>
          <execution>
            <id>build-native</id>
            <goals>
              <goal>compile-no-fork</goal>
            </goals>
            <phase>package</phase>
          </execution>
        </executions>
      </plugin>

[grobmeier]

Thanks you looks good!