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https://issues.apache.org/jira/browse/LOG4J2-2254?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Johannes Donath closed LOG4J2-2254.
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> Empty Automatic-Module-Name Header
> ----------------------------------
>
> Key: LOG4J2-2254
> URL: https://issues.apache.org/jira/browse/LOG4J2-2254
> Project: Log4j 2
> Issue Type: Bug
> Components: API, Core
> Affects Versions: 2.10.0, 2.11.0, 3.0.0
> Environment: Java 9.0.1+11 (using module-info manifests)
> Reporter: Johannes Donath
> Priority: Major
> Fix For: 2.11.0
>
>
> The snapshot releases of log4j-api and log4j-core are currently generated
> with an empty Automatic-Module-Name header within their manifests. As Java 9
> will look for this header first, it is impossible to compile against (with
> the exception of the maven-compiler-plugin which seems to circumvent this
> issue somehow) or load these jars even when a module-info.class is present
> (see below).
> This issue currently only affects 2.10.1-SNAPSHOT and 3.0.0-SNAPSHOT versions
> and prevents developers from integrating log4j in their modular projects
> entirely (since the latest stable release (2.10.0) is affected by LOG4J2-2129
> and thus fails to load within these environments as well).
> A test project which will produce the errors outlined below is available
> [here|https://github.com/dotStart/log4j-jigsaw-test] (compiler errors only
> seem to occur within IDEs, runtime errors do occur regardless of compilation
> method).
> h3. Error Messages
> {code:java}
> java: cannot determine module name for
> <home>\.m2\repository\org\apache\logging\log4j\log4j-core\2.10.1-SNAPSHOT\log4j-core-2.10.1-20180131.145844-171.jar{code}
> {code:java}
> java: cannot determine module name for
> <home>\.m2\repository\org\apache\logging\log4j\log4j-core\3.0.0-SNAPSHOT\log4j-core-3.0.0-20180216.142957-18.jar
> {code}
> {code:java}
> Error occurred during initialization of boot layer
> java.lang.module.FindException: Unable to derive module descriptor for
> target\log4j-core-3.0.0-SNAPSHOT.jar
> Caused by: java.lang.module.FindException: Automatic-Module-Name: : Invalid
> module name: '' is not a Java identifier
> {code}
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