Runtime or docs are wrong for %logger{1.2.*}

[garydgregory]

Description

Either the runtime or docs are wrong for layouts like %logger{1.2.*}.

The docs on page https://logging.apache.org/log4j/2.x/manual/pattern-layout.html say:

%c{1.2.*} | org.apache.commons.test.Foo | o.a.c.test.Foo

IOW, these docs say that only last 2 segments only are not abbreviated.

At runtime, in 2.24.1, I see, the opposite, the first 2 are abbreviated instead, for example

2024-10-29T09:50:57,046-0400 DEBUG [qtp1445038386-63][c.rs.seagull.httpmonitor.MyDomainClassName.50698c70] 865192895 async write complete of org.eclipse.jetty.ee9.proxy.MyDomainClassName$Chunk@76fdb2fc (17 bytes) on HttpOutput@7d59c816{s=OPEN,api=READY,sc=false,e=null}

How do I say I want to abbreviate everything except the last N?

Configuration

Version: 2.24.1

Microsoft Windows [Version 10.0.19045.5011]

openjdk version "17.0.12" 2024-07-16
OpenJDK Runtime Environment Temurin-17.0.12+7 (build 17.0.12+7)
OpenJDK 64-Bit Server VM Temurin-17.0.12+7 (build 17.0.12+7, mixed mode, sharing)

Apache Maven 3.9.9 (8e8579a9e76f7d015ee5ec7bfcdc97d260186937)
Maven home: C:\java\apache-maven-3.9.9
Java version: 17.0.12, vendor: Eclipse Adoptium, runtime: C:\Program Files\Eclipse Adoptium\jdk-17.0.12.7-hotspot
Default locale: en_US, platform encoding: Cp1252
OS name: "windows 10", version: "10.0", arch: "amd64", family: "windows"

Docker version 27.3.1, build ce12230

Reproduction

      <PatternLayout noConsoleNoAnsi="false"
        pattern="%style{%d{ISO8601_OFFSET_DATE_TIME_HHMM}}{white} %highlight{%-5level}{TRACE=white} %style{[%t]}{yellow}%style{[%logger{1.2.*}]%notEmpty{[%markerSimpleName]}}{white} %highlight{%msg%n%xThrowable}{TRACE=white}" />

Logs

Same as above:

2024-10-29T09:50:57,046-0400 DEBUG [qtp1445038386-63][c.rs.seagull.httpmonitor.MyDomainClassName.50698c70] 865192895 async write complete of org.eclipse.jetty.ee9.proxy.MyDomainClassName$Chunk@76fdb2fc (17 bytes) on HttpOutput@7d59c816{s=OPEN,api=READY,sc=false,e=null}

[ppkarwasz]

There is problem in the documentation. Some time ago I wrote a SO answer based on the code. Can you fix the doc?

[ppkarwasz]

In your case 1.2.* should mean: 1 character from the first component, 2 character from the second component, no restriction for the remaining.