build(log4j2): Pin compilation to JDK 8 via Maven Toolchains#616
Open
rschmitt wants to merge 1 commit into
Open
build(log4j2): Pin compilation to JDK 8 via Maven Toolchains#616rschmitt wants to merge 1 commit into
rschmitt wants to merge 1 commit into
Conversation
Release 1.6.3 was built on a JDK that does not run annotation processors by default, which silently dropped the Log4j2 plugin descriptor (META-INF/.../Log4j2Plugins.dat) for LambdaAppender, LambdaTextFormat, and LambdaJsonFormat. The published artifact was broken at runtime: log4j could not resolve <Lambda>, <LambdaTextFormat>, or <LambdaJsonFormat> elements in user log4j2.xml configurations. Configure maven-toolchains-plugin to require a JDK 8 toolchain so javac comes from a JDK that runs annotation processors by default, regardless of which JVM Maven is invoked under. The version range [1.8,9) matches both "1.8" and "8". The existing GitHub Actions workflow at .github/workflows/aws-lambda-java-log4j2.yml uses actions/setup-java@v5 with java-version: 8 and distribution: corretto. setup-java@v5 auto-generates a ~/.m2/toolchains.xml entry with <version>8</version>, which the [1.8,9) range matches, so no workflow changes are required. When no matching JDK 8 toolchain is available, the build now fails fast at the validate phase with a clear "Cannot find matching toolchain definitions" error instead of silently producing an artifact missing its plugin descriptor.
Contributor
|
Thanks for the contribution this would have prevented #612. |
darklight3it
approved these changes
May 23, 2026
Contributor
darklight3it
left a comment
darklight3it
left a comment
There was a problem hiding this comment.
LGTM 🚀 this should be merged once the basic tests on #615 are exercised.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Release 1.6.3 was built on a JDK that does not run annotation processors by default, which silently dropped the Log4j2 plugin descriptor (META-INF/.../Log4j2Plugins.dat) for LambdaAppender, LambdaTextFormat, and LambdaJsonFormat. The published artifact was broken at runtime: log4j could not resolve
<Lambda>,<LambdaTextFormat>, or<LambdaJsonFormat>elements in user log4j2.xml configurations.Configure maven-toolchains-plugin to require a JDK 8 toolchain so javac comes from a JDK that runs annotation processors by default, regardless of which JVM Maven is invoked under. The version range [1.8,9) matches both "1.8" and "8".
The existing GitHub Actions workflow at .github/workflows/aws-lambda-java-log4j2.yml uses actions/setup-java@v5 with java-version: 8 and distribution: corretto. setup-java@v5 auto-generates a ~/.m2/toolchains.xml entry with 8, which the [1.8,9) range matches, so no workflow changes are required.
When no matching JDK 8 toolchain is available, the build now fails fast at the validate phase with a clear "Cannot find matching toolchain definitions" error instead of silently producing an artifact missing its plugin descriptor.
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.