[logback-user] Upgrading Logback Classic from 1.3.8 to 1.3.9 causes ClassNotFoundException: ch.qos.logback.classic.spi.Configurator

Ceki Gülcü ceki at qos.ch
Wed Aug 9 11:17:47 CEST 2023

Hi Christian,

Thank you for bringing this issue to our attention.

The class has been moved to logback-core module under
ch.qos.logback.core.spi package by mistake during experimentation and
will be reverted in the next version.

Best regards,

Ceki Gülcü

Sponsoring SLF4J/logback/reload4j at https://github.com/sponsors/qos-ch

On 8/9/2023 8:44 AM, "Christian Möller via logback-user
<logback-user at qo"@qos.ch wrote:
> Hello everybody,
> this morning weekly build of our software breaks with
>    java.lang.ClassNotFoundException:
> ch.qos.logback.classic.spi.Configurator
> As we configure Gradle to apply
>    runtimeOnly('ch.qos.logback:logback-classic:1.3+')
> this build receives new patch level version 1.3.9, published a few days
> ago.
> I've downloaded both versions, 1.3.8 and 1.3.9, of the lib from [1],
> missing class is available with 1.3.8, but missing in 1.3.9.
> General remark: I do not expect such a modification with patch level
> updates.
> My question: Is this a bug on your side, or have I missed some
> deprecation announcement explaining how to reconfigure Logback, or apply
> another Logback lib, or the like to avoid this problem?
> Thanks and regards
> Christian
> [1] https://mvnrepository.com/artifact/ch.qos.logback/logback-classic

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