ppkarwasz commented on issue #3927:
URL:
https://github.com/apache/logging-log4j2/issues/3927#issuecomment-3285236973
Hi @blacklong,
This doesn’t look like a bug. `${web:rootDir}` expands to itself **by
design** if:
* The **`web` lookup** isn’t available (make sure
`log4j-jakarta-web/log4j-web` is on the classpath).
* The lookup returns `null` (e.g. Log4j initializes before the servlet
container, or you’re outside a Servlet environment).
If you want a safe fallback, you can define a default:
```xml
<Properties>
<Property name="rootDir" value="."/>
<Property name="logPath">${web:rootDir}/../data/log</Property>
</Properties>
```
That way, if `web:rootDir` returns `null`, `${rootDir}` is used instead.
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