Joakim Erdfelt created SLF4J-487:
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Summary: module-info.class must be in root of jar, not
META-INF/versions/9
Key: SLF4J-487
URL: https://jira.qos.ch/browse/SLF4J-487
Project: SLF4J
Issue Type: Bug
Components: Core API
Affects Versions: 2.0.0-alpha1
Environment: Also reported here
[https://github.com/qos-ch/slf4j/commit/fb418db538a4990#r37662713]
This triggers build warnings on javac.
The {{module-info.class}} shouldn't be in the {{META-INF/versions/9}} in the
jar file, it should be in the root of the jar file.
Yes, I'm aware of -SLF4J-456-, but that's a bug in websphere's annotation
parsing (a similar bug that *all* web containers have had to fix since
[JEP238|https://openjdk.java.net/jeps/238] became a reality).
From maven (Eclipse Jetty 10.x is migrating to Slf4j 2.0.0-alpha1 btw).
{noformat}
[INFO] — maven-compiler-plugin:3.8.1:compile (default-compile) @
jetty-slf4j-impl —
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 9 source files to
/home/joakim/code/jetty/jetty.project-10.0.x/jetty-slf4j-impl/target/classes
[WARNING]
/home/joakim/code/jetty/jetty.project-10.0.x/jetty-slf4j-impl/src/main/java/module-info.java:[26,28]
requires transitive directive for an automatic module
{noformat}
Using {{javac -Xlint:all ...}} on a project using
{{slf4j-api-2.0.0-alpha1.jar}} with it's own {{module-info.class}} will show
the above warning.
If you want a small example project, I'll be happy to make one for you.
The warning is because the {{module-info.class}} is not present at the root of
the jar file (where it must be, despite the jigsaw devs brief suggestion in
2018 that {{META-INF/versions/9}} could be a solution for bytecode scanning
problems, other tooling in the JDK hasn't caught up yet to that suggestion,
even in JDK 14, even including {{javac}}).
javac sees {{slf4j-api-2.0.0-alpha1.jar}} as having no {{module-info.class}}
and is instead using the jar as one with an automatic module name.
Manually repackaging {{slf4j-api-2.0.0-alpha1.jar}} with the
{{module-info.class}} in the root fixes the javac warnings.
Reporter: Joakim Erdfelt
Assignee: SLF4J developers list
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