Johannes Donath created LOG4J2-2254:
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Summary: 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
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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