Upgrade to SLF4J 2.0 and Logback 1.4

See original GitHub issue

With thanks to @rwinch, I’ve just learned that Boot doesn’t work with Logback 1.3 (still in alpha). It fails on launch with the following exception:

java.lang.NoClassDefFoundError: org/slf4j/impl/StaticLoggerBinder
    at org.springframework.boot.logging.logback.LogbackLoggingSystem.getLoggerContext(LogbackLoggingSystem.java:273)
    at org.springframework.boot.logging.logback.LogbackLoggingSystem.beforeInitialize(LogbackLoggingSystem.java:99)
    at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationStartingEvent(LoggingApplicationListener.java:191)
    at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:170)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127)
    at org.springframework.boot.context.event.EventPublishingRunListener.starting(EventPublishingRunListener.java:68)
    at org.springframework.boot.SpringApplicationRunListeners.starting(SpringApplicationRunListeners.java:48)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:313)

StaticLoggerBinder was removed in this commit which appears to be part of a broader effort to provide Jigsaw modules for SLF4J and Logback.

Issue Analytics

State:
Created 5 years ago
Reactions:19
Comments:70 (39 by maintainers)

Top GitHub Comments

9reactions

zyxistcommented, Oct 6, 2022

It’s possible to make Spring Boot 2.x work with Slf4j 2.0 simply by disabling the custom logging facade used by Spring Boot. To do so, one needs to set org.springframework.boot.logging.LoggingSystem system property to none (and also making sure that all dependencies to logback/slf4j on classpath have been updated in Maven/Gradle). I managed to run my project in this way.

As I looked at the code, it should be possible to write a custom LoggingSystemFactory for Spring Boot that delegates stuff to Slf4j, rather than talking to Logback directly. The public API of Slf4j 2.0.x is backward compatible with 1.x. In fact, I wished if things were done in this way from the beginning.

4reactions

wilkinsonacommented, Sep 23, 2022

@code-magician323 As I said above, the current target is 3.0.0-RC1.

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