robinmarechal opened a new pull request, #21321:
URL: https://github.com/apache/kafka/pull/21321
Some YAML parsers seems to parse `OFF` as `false`, which leads to failure in
log4j configuration loading:
```
2026-01-15T20:10:38.166033500Z main WARN Error while converting string
[false] to type [class org.apache.logging.log4j.Level]. Using default value
[null].
java.lang.IllegalArgumentException: Unknown level constant [FALSE].
at org.apache.logging.log4j.Level.valueOf(Level.java:348)
at
org.apache.logging.log4j.core.config.plugins.convert.TypeConverters$LevelConverter.convert(TypeConverters.java:301)
...
```
Simply using quotes around `OFF` prevents this issue.
The following YAML
```yaml
Loggers:
Root:
level: OFF # <-- Without ""
AppenderRef:
- ref: STDOUT
```
Is parsed to
```json
{
"Loggers" : {
"Root" : {
"level" : false, // <-- Instead of "OFF"
"AppenderRef" : [ {
"ref" : "STDOUT"
} ]
}
}
```
Mentioned in old YAML specs (https://yaml.org/type/bool.html).
An element matching this regex is treated as a boolean:
`y|Y|yes|Yes|YES|n|N|no|No|NO|true|True|TRUE|false|False|FALSE|on|On|ON|off|Off|OFF`
I did not found any mention anywhere that it is not the case anymore, and I
have the error in my applications.
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