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Upgrade slf4j to 2.0.0

See original GitHub issue

slf4j has recently been upgraded by a major version, in order to use current versions of dependent libraries (logback-core, logback-classic) we need playframework to upgrade the version of slf4j to 2.0.0 as well.

Play Version

2.8.16

API

scala

Operating System

Mac

JDK

Library Dependencies

logback-classic, logback-core 1.4.0

Expected Behavior

The server is able to initialise

Actual Behavior

The server cannot startup because the version of slf4j is incompatible

[error] java.lang.NoClassDefFoundError: org/slf4j/impl/StaticLoggerBinder
[error] 	at play.api.libs.logback.LogbackLoggerConfigurator.loggerFactory(LogbackLoggerConfigurator.scala:21)
[error] 	at play.api.libs.logback.LogbackLoggerConfigurator.configure(LogbackLoggerConfigurator.scala:84)
[error] 	at play.api.libs.logback.LogbackLoggerConfigurator.init(LogbackLoggerConfigurator.scala:31)
[error] 	at play.core.server.DevServerStart$.$anonfun$mainDev$1(DevServerStart.scala:106)
[error] 	at play.utils.Threads$.withContextClassLoader(Threads.scala:22)
[error] 	at play.core.server.DevServerStart$.mainDev(DevServerStart.scala:76)
[error] 	at play.core.server.DevServerStart$.mainDevHttpMode(DevServerStart.scala:50)
[error] 	at play.core.server.DevServerStart.mainDevHttpMode(DevServerStart.scala)
[error] 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[error] 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
[error] 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[error] 	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
[error] 	at play.runsupport.Reloader$.startDevMode(Reloader.scala:306)
[error] 	at play.sbt.run.PlayRun$.devModeServer$lzycompute$1(PlayRun.scala:100)
[error] 	at play.sbt.run.PlayRun$.devModeServer$1(PlayRun.scala:83)
[error] 	at play.sbt.run.PlayRun$.$anonfun$playRunTask$3(PlayRun.scala:107)
[error] 	at play.sbt.run.PlayRun$.$anonfun$playRunTask$3$adapted(PlayRun.scala:67)
[error] 	at scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] Caused by: java.lang.ClassNotFoundException: org.slf4j.impl.StaticLoggerBinder
[error] 	at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:445)
[error] 	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:587)
[error] 	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
[error] 	at play.api.libs.logback.LogbackLoggerConfigurator.loggerFactory(LogbackLoggerConfigurator.scala:21)
[error] 	at play.api.libs.logback.LogbackLoggerConfigurator.configure(LogbackLoggerConfigurator.scala:84)
[error] 	at play.api.libs.logback.LogbackLoggerConfigurator.init(LogbackLoggerConfigurator.scala:31)
[error] 	at play.core.server.DevServerStart$.$anonfun$mainDev$1(DevServerStart.scala:106)
[error] 	at play.utils.Threads$.withContextClassLoader(Threads.scala:22)
[error] 	at play.core.server.DevServerStart$.mainDev(DevServerStart.scala:76)
[error] 	at play.core.server.DevServerStart$.mainDevHttpMode(DevServerStart.scala:50)
[error] 	at play.core.server.DevServerStart.mainDevHttpMode(DevServerStart.scala)
[error] 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[error] 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
[error] 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[error] 	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
[error] 	at play.runsupport.Reloader$.startDevMode(Reloader.scala:306)
[error] 	at play.sbt.run.PlayRun$.devModeServer$lzycompute$1(PlayRun.scala:100)
[error] 	at play.sbt.run.PlayRun$.devModeServer$1(PlayRun.scala:83)
[error] 	at play.sbt.run.PlayRun$.$anonfun$playRunTask$3(PlayRun.scala:107)
[error] 	at play.sbt.run.PlayRun$.$anonfun$playRunTask$3$adapted(PlayRun.scala:67)
[error] 	at scala.Function1.$anonfun$compose$1(Function1.scala:49)

Issue Analytics

State:
Created a year ago
Reactions:1
Comments:7 (6 by maintainers)

Top GitHub Comments

1reaction

mkurzcommented, Sep 12, 2022

Thanks @jfsoul, can you provide a pull request with your change?

1reaction

jfsoulcommented, Sep 8, 2022

@mkurz I had a quick look and I’m wondering whether we can resolve on 2.8.x fairly simply after all.

In https://github.com/playframework/playframework/compare/2.8.x...jfsoul:playframework:2.8.x if we replace the direct reference to StaticLoggerBinder with call to the factory method, then we should be able to work with SLF4J 1 or 2 because the factory finds the logging backend for us.

It looks like that used to be the way it was done until this change although I don’t understand the reason for changing to use StaticLoggerBinder directly, so I’m a little hesitant.

I can spend a bit more time on it and PR, if this sounds reasonable.

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