Started testing Java9 with log4j 1.2, SLF4J and logback projects

dalibor topic dalibor.topic at
Tue Feb 14 16:42:01 UTC 2017

On 14.02.2017 12:14, Ceki Gülcü wrote:
> In the context of SLF4J, the build of the slf4j-log4j12 module fails
> since log4j can no longer correctly detect the version of Java and shuts
> down MDC support. In short, the changes introduced in JEP 223 have
> significant consequences for log4j 1.2.x and by ricochet for SLF4J.

Hi Ceki,

general information about Log4J 1.x on JDK9 can be found at .

In particular, the blog points to a potential workaround for Log4j 1.x, 
although, of course, migrating off libraries that are no longer 
maintained should be the preferred choice for most developers.

dalibor topic

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