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Posted to notifications@logging.apache.org by "Hakky54 (via GitHub)" <gi...@apache.org> on 2023/02/01 09:17:56 UTC
[GitHub] [logging-log4j2] Hakky54 opened a new issue, #1232: log4j-to-slf4j not working with slf4j v2
Hakky54 opened a new issue, #1232:
URL: https://github.com/apache/logging-log4j2/issues/1232
## Description
I am using log4j-to-slf4j to forward all log4j calls to slf4j for my library [LogCaptor](https://github.com/Hakky54/log-captor). At August 2022 slf4j maintainers released version 2 which does not work anymore with `log4j-to-slf4j`. Would it be possible to make it compatible again?
A workaround for me would be forwarding log4j calls to jul and use that, but that I would not be able to use MDC for example and that is the reason why I am hoping that log4j-to-slf4j could be compatible with the latest slf4j release.
[A clear and concise description of what the bug is.]
Non log calls are being sent to slf4j (tested with v2.0.6) from log4j (tested with v2.19.0)
## Configuration
**Version:** 2.19.0
**Operating system:** any
**JDK:** oracle jdk 1.8
## Logs
```
[Stacktraces, errors, etc. relevant applications logs.]
```
## Reproduction
Git fork and clone: https://github.com/Hakky54/log-captor
Adjust the slf4j version to 2.0.6 and run the test with `mvn verify`
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Re: [I] log4j-to-slf4j not working with slf4j v2 (logging-log4j2)
Posted by "HannesWell (via GitHub)" <gi...@apache.org>.
HannesWell commented on issue #1232:
URL: https://github.com/apache/logging-log4j2/issues/1232#issuecomment-1471922943
In the OSGi world it is currently indeed impossible to use log4j-to-slf4j in conjunction with slf4j-2 because the Manifest only imports the slf4j packages only up until, but excluding 2:
```
Import-Package:
[...]
org.slf4j;version="[1.7,2)",
org.slf4j.spi;version="[1.7,2)"
```
If log4j-to-slf4j works well with slf4j 1 and 2 I suggest to widen the package import range to "[1.7,3)".
If the log4j maintainers are interested I can provide a corresponding PR.
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Re: [I] log4j-to-slf4j not working with slf4j v2 (logging-log4j2)
Posted by "Hakky54 (via GitHub)" <gi...@apache.org>.
Hakky54 commented on issue #1232:
URL: https://github.com/apache/logging-log4j2/issues/1232#issuecomment-1473752875
By the way guys, just out of curiosity, how come this situation works for my library with logcaptor using slf4j v2 and latest version of log4j-to-slf4j, but not working for the OSGi world?
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[GitHub] [logging-log4j2] Hakky54 closed issue #1232: log4j-to-slf4j not working with slf4j v2
Posted by "Hakky54 (via GitHub)" <gi...@apache.org>.
Hakky54 closed issue #1232: log4j-to-slf4j not working with slf4j v2
URL: https://github.com/apache/logging-log4j2/issues/1232
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Re: [I] log4j-to-slf4j not working with slf4j v2 (logging-log4j2)
Posted by "ppkarwasz (via GitHub)" <gi...@apache.org>.
ppkarwasz closed issue #1232: log4j-to-slf4j not working with slf4j v2
URL: https://github.com/apache/logging-log4j2/issues/1232
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[GitHub] [logging-log4j2] Hakky54 commented on issue #1232: log4j-to-slf4j not working with slf4j v2
Posted by "Hakky54 (via GitHub)" <gi...@apache.org>.
Hakky54 commented on issue #1232:
URL: https://github.com/apache/logging-log4j2/issues/1232#issuecomment-1411827465
Nevermind, I had a dependency management issue with dependencies having different versions. There is no issue, so I am closing it.
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Re: [I] log4j-to-slf4j not working with slf4j v2 (logging-log4j2)
Posted by "HannesWell (via GitHub)" <gi...@apache.org>.
HannesWell commented on issue #1232:
URL: https://github.com/apache/logging-log4j2/issues/1232#issuecomment-1473943719
> By the way guys, just out of curiosity, how come this situation works for my library with logcaptor using slf4j v2 and latest version of log4j-to-slf4j, but not working for the OSGi world?
Because non OSGi applications usually don't care about the OSGi metadata. But the OSGi metadata said that log4j-to-slf4j required slf4j in version `[1.7,2)`. Therefore an OSGi runtime refused to resolve the `log4j.to-slf4j` if only slf4j1.7.x is available.
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Re: [I] log4j-to-slf4j not working with slf4j v2 (logging-log4j2)
Posted by "ppkarwasz (via GitHub)" <gi...@apache.org>.
ppkarwasz commented on issue #1232:
URL: https://github.com/apache/logging-log4j2/issues/1232#issuecomment-1471938958
@HannesWell,
Sure, PRs are welcome. We use `maven-bundle-plugin` to generate the OSGI manifest.
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