Iurii Ignatko created MNG-8086:
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Summary: Maven no longer initializes logging configuration based
on java.util.logging config file
Key: MNG-8086
URL: https://issues.apache.org/jira/browse/MNG-8086
Project: Maven
Issue Type: Bug
Components: Logging
Affects Versions: 4.0.0-alpha-12
Reporter: Iurii Ignatko
h3. Bug description and the root cause
When supplying the logging configuration to the Maven build using
{noformat}
-Djava.util.logging.config.file{noformat}
, the configuration isn't propagated to the logger.
This started when the [following PR|https://github.com/apache/maven/pull/1279]
was merged. The reason is [this line
|https://github.com/apache/maven/blob/003a5bc06daa6e74c98e4d8ab45c6643a6844975/maven-embedder/src/main/java/org/apache/maven/cli/MavenCli.java#L191]
in the constructor and, as a second step, a [similar
change|[http://example.com|https://github.com/apache/maven/blob/003a5bc06daa6e74c98e4d8ab45c6643a6844975/maven-jline/src/main/java/org/apache/maven/jline/MessageUtils.java#L37]]
in org.apache.maven.jline.MessageUtils.
The root cause of the issue lies in the fact that any instance of
{{org.jline.utils.StyleResolver}}
[triggers|https://github.com/jline/jline3/blob/19c031c0bccaeea6a4346bc82c04c7bd3ec18888/terminal/src/main/java/org/jline/utils/StyleResolver.java#L27]
the {{java.util.logging.Logger }}initialization. This process happens before
MavenCli's
[doMain|https://github.com/apache/maven/blob/003a5bc06daa6e74c98e4d8ab45c6643a6844975/maven-embedder/src/main/java/org/apache/maven/cli/MavenCli.java#L273]
method is invoked, which
[populates|https://github.com/apache/maven/blob/003a5bc06daa6e74c98e4d8ab45c6643a6844975/maven-embedder/src/main/java/org/apache/maven/cli/MavenCli.java#L614]
the system properties the logging initializer uses.
Before the migration to JLine, Jansi's JansiMessageBuilderFactory didn't have
any logger initialization logic (neither by itself nor by any auxiliary
components created when that library was used). Hence, the system properties
were all set by the time any logger was found, as that used to happen somewhere
later in the lifecycle.
h3. Reproducer
The issue can be easily reproduced by supplying the following logging
configuration to any Maven build:
{code:java}
handlers=java.util.logging.ConsoleHandler
.level=FINE
java.util.logging.ConsoleHandler.level=FINE
java.util.logging.ConsoleHandler.formatter=java.util.logging.SimpleFormatter{code}
When built with Maven version 4.0.0-alpha-10 (or any prior version), note the
amount of FINE level logs that are being printed.
Starting from 4.0.0-alpha-12, those log entries are not printed anymore.
h3. Solution
The issue can be fixed in multiple ways:
# Reorganize object creation in Maven such that the logger initialization
happens after system properties are set.
# Change in JLine's {{org.jline.utils.StyleResolver}}
# Some combination of both.
I was able to do a quick fix using Option (2) as a PoC solution. A proper fix,
however, is something to decide upon.
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