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Jul 3, 2025
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doc: Clarify and enhance GraalVmProcessor configuration example #3786

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29 changes: 16 additions & 13 deletions src/site/antora/modules/ROOT/pages/manual/plugins.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -211,8 +211,8 @@ annotation processor creates such a file at compile-time.
[WARNING]
====
The `GraalVmProcessor` needs to know the `groupId` and `artifactId` coordinates of your project.
These must be supplied to the processor using the `log4j.graalvm.groupId` and `log4j.graalvm.artifactId` annotation processor options.
The `GraalVmProcessor` requires your project's `groupId` and `artifactId` to correctly generate the GraalVM reachability metadata file in the recommended location.
Provide these values to the processor using the `log4j.graalvm.groupId` and `log4j.graalvm.artifactId` annotation processor options.
====
You need to configure your build tool as follows to use both plugin processors:
Expand All @@ -227,15 +227,23 @@ Maven::
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<compilerArgs>
<!-- Provide the project coordinates to `GraalVmProcessor`: -->
<arg>-Alog4j.graalvm.groupId=${project.groupId}</arg>
<arg>-Alog4j.graalvm.artifactId=${project.artifactId}</arg>
</compilerArgs>
</configuration>
<executions>
<execution>
<id>generate-log4j-plugin-descriptor</id>
<goals>
<goal>compile</goal>
</goals>
<phase>process-classes</phase>
<!--
~ Explicitly list the annotation processors for the default compile execution.
~ This is required starting with JDK 23, where annotation processors are not enabled automatically.
~ Explicit configuration also improves build reliability and clarity.
~ For more details, see: https://inside.java/2024/06/18/quality-heads-up/
-->
<id>default-compile</id>
<configuration>
<proc>only</proc>
<annotationProcessorPaths>
<!-- Include `log4j-core` providing
1. `org.apache.logging.log4j.core.config.plugins.processor.PluginProcessor` that generates `Log4j2Plugins.dat`
Expand All @@ -252,11 +260,6 @@ Maven::
<!-- Process sources using `GraalVmProcessor` to generate a GraalVM reachability metadata file -->
<processor>org.apache.logging.log4j.core.config.plugins.processor.GraalVmProcessor</processor>
</annotationProcessors>
<compilerArgs>
<!-- Provide the project coordinates to `GraalVmProcessor`: -->
<arg>-Alog4j.graalvm.groupId=${project.groupId}</arg>
<arg>-Alog4j.graalvm.artifactId=${project.artifactId}</arg>
</compilerArgs>
</configuration>
</execution>
</executions>
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