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2.25.0

This minor release introduces bug fixes, behavior improvements, and complete support for GraalVM native image generation.

GraalVM Reachability Metadata

Log4j Core and all extension modules now include embedded
GraalVM reachability metadata,
enabling seamless generation of native images with GraalVM out of the box—no manual configuration required.
For more information, refer to our GraalVM guide.

[!NOTE]
When building third-party Log4j plugins, using the new GraalVmProcessor
introduced in version 2.25.0 will automatically generate the required reachability metadata for GraalVM native images.
However, the processor will fail the build if the required log4j.graalvm.groupId and log4j.graalvm.artifactId parameters are not provided.
For detailed instructions, see Registering plugins.

Exception Handling in Pattern Layout

Exception handling in Pattern Layout has undergone a significant rewrite.
This update resolves several bugs and ensures consistent behavior across all exception converters.
Key improvements include:

• Stack traces are now consistently prefixed with a newline instead of other whitespace.
• The default exception converter has changed from extended to plain, offering better performance.
• Support for the {ansi} option in exception converters has been removed.

Date & Time Formatting

Log4j has historically provided custom date and time formatters for performance, such as FixedDateFormat and FastDateFormat.
These are now deprecated in favor of Java’s standard DateTimeFormatter.

If you encounter formatting issues after upgrading—particularly with n or x directives—you can temporarily revert to the legacy formatters by setting the log4j2.instantFormatter property to legacy.
Please report any issues via our issue tracker.

ANSI Support on Windows

Modern Windows versions (10 and newer) provide native ANSI escape sequence support.
As a result, dependency on the outdated JAnsi 1.x library has been removed.
For details, refer to ANSI styling on Windows.

Jakarta JMS Appender

A Jakarta-compatible version of the JMS Appender is now included in the core distribution.

Added

• Add Google OSS-Fuzz integration (#2949)
• Add a GraalVmProcessor annotation processor to generate GraalVM reachability metadata. (#3053)
• Add MonitorResource configuration option to support the monitoring of external files in addition to the configuration file itself. (#3074, #3501)
• Fixed typo in "LoggerConfig.RootLogger.Builder#withtFilter(...)" method. Created new corrected 'withFilter()' method and deprecated old method. (#3369)

... (truncated)

• ea10ad3 Update the project.build.outputTimestamp property
• 75061eb fix: Javadoc and documentation problems
• c9fbc53 fix: use normalized form for new configuration property
• 62e802d Prepare release notes for 2.25.0
• 422c385 Bump apache/logging-parent/.github/workflows/deploy-site-reusable.yaml@rel/12...
• 0c5b2b8 Bump apache/logging-parent/.github/workflows/deploy-snapshot-reusable.yaml@re...
• 2b5c2a9 Bump apache/logging-parent/.github/workflows/codeql-analysis-reusable.yaml@re...
• 74df313 Bump apache/logging-parent/.github/workflows/build-reusable.yaml@rel/12.1.0 (...
• 95d451b Bump apache/logging-parent/.github/workflows/deploy-release-reusable.yaml@rel...
• 5655118 Bump apache/logging-parent/.github/workflows/verify-reproducibility-reusable....
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