darkSheep404 opened a new issue, #3358:
URL: https://github.com/apache/logging-log4j2/issues/3358
## Description
Log4j2 yml config do not support YAML Anchors and Aliases with error Logger
contains an invalid element or attribute "<<"
```
Configuration:
status: WARN
Appenders:
RollingFileTemplate: &RollingFileTemplate
ignoreExceptions: false
PatternLayout:
pattern: "[%d{yyyy-MM-dd HH:mm:ss.SSS}] [%X{traceId},%X{spanId}]
[%pid] [%thread] %-5level %X{class}.%M - %msg%n"
Policies:
SizeBasedTriggeringPolicy:
size: "50 MB"
DefaultRolloverStrategy:
max: 200
RollingFile:
- name: XX_LOGGER_LOG
fileName: ./logs/xx/${env:HOSTNAME:-}/app/app.log
filePattern: "./logs/xx/${env:HOSTNAME:-}/app/app_%d{yyyy}-%i.log.gz"
<<: *RollingFileTemplate
Loggers:
Root:
level: INFO
AppenderRef:
- ref: CONSOLE_OUT_APPENDER
- ref: XX_LOGGER_LOG
```
```
main ERROR Unable to locate plugin for LoggerTemplate
2025-01-06T08:35:01.514260458Z 2025-01-06 08:35:01,514 main ERROR Logger
contains an invalid element or attribute "<<"
2025-01-06T08:35:01.514794013Z 2025-01-06 08:35:01,514 main ERROR Logger
contains an invalid element or attribute "<<"
2025-01-06T08:35:01.515709563Z 2025-01-06 08:35:01,515 main ERROR Logger
contains an invalid element or attribute "<<"
2025-01-06T08:35:01.516202917Z 2025-01-06 08:35:01,516 main ERROR Logger
contains an invalid element or attribute "<<"
2025-01-06 08:35:01,516 main ERROR Unable to invoke factory method in class
org.apache.logging.log4j.core.config.LoggersPlugin for element Loggers:
java.lang.NullPointerException
```
## Configuration
**Version:** [2.18.0]
**Operating system:** [redheat]
**JDK:** [JDK 8 ]
## Logs
```
[Stacktraces, errors, etc. relevant applications logs.]
```
## Reproduction
```
```
[An isolated test reproducing the test.
JUnit tests similar to the ones in the code base are extremely appreciated.]
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