Unwanted `TRACE` output in v2.23.1 with `-Dlog4j.debug=false`

[vkolomeyko]

Description

The effect of -Dlog4j.debug=false has changed in v2.23.1

Configuration

Version: 2.23.1

Operating system: Windows

JDK: zulu17.46.19-ca-jdk17.0.9-win_x64

Reproduction

Consider the following Java program:

package org.example;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class Main {

    public static void main(String[] args) {
        System.setProperty("log4j.debug", "false");

        Logger log = LogManager.getLogger(Main.class);
        log.error("Hello world!");
    }
}

With Log4j v2.23.0 it prints:

15:20:02.690 [main] ERROR org.example.Main - Hello world!

as expected.

However, when version is upgraded to v2.23.1, the output becomes a lot more verbose:

...
2024-07-03T14:23:42.658351400Z main TRACE Using default SystemClock for timestamps.
2024-07-03T14:23:42.658351400Z main DEBUG org.apache.logging.log4j.core.util.SystemClock supports precise timestamps.
2024-07-03T14:23:42.658351400Z main TRACE Using DummyNanoClock for nanosecond timestamps.
2024-07-03T14:23:42.658351400Z main DEBUG Reconfiguration complete for context[name=1d44bcfa] at URI NULL_SOURCE (org.apache.logging.log4j.core.LoggerContext@67e2d983) with optional ClassLoader: null
2024-07-03T14:23:42.658351400Z main DEBUG Shutdown hook enabled. Registering a new one.
2024-07-03T14:23:42.659352600Z main DEBUG LoggerContext[name=1d44bcfa, org.apache.logging.log4j.core.LoggerContext@67e2d983] started OK.
15:23:42.661 [main] ERROR org.example.Main - Hello world!
2024-07-03T14:23:42.663882800Z pool-1-thread-1 DEBUG Stopping LoggerContext[name=1d44bcfa, org.apache.logging.log4j.core.LoggerContext@67e2d983]
2024-07-03T14:23:42.664881900Z pool-1-thread-1 DEBUG Stopping LoggerContext[name=1d44bcfa, org.apache.logging.log4j.core.LoggerContext@67e2d983]...
2024-07-03T14:23:42.664881900Z pool-1-thread-1 TRACE Unregistering 1 MBeans: [org.apache.logging.log4j2:type=1d44bcfa]
...

which is unexpected.

[ppkarwasz]

Thank you for your report and the patch!