Hi all, You can find a Jigsaw modularized version of SLF4J at https://github.com/qos-ch/slf4j/tree/1_8_0-SNAPSHOT Unfortunately, due to javadoc issues, I was unable to deploy jar files to Maven Central. If interested in testing this Jigsaw modularized version, you need to compile from source. You also need to configure toolchains for JDK 9 and 6. There is some documentation on tools chains: https://maven.apache.org/guides/mini/guide-using-toolchains.html For good measure, here is my toolschains.xml file: <toolchains> <toolchain> <type>jdk</type> <provides> <version>1.6</version> </provides> <configuration> <jdkHome>c:/java/jdk1.7.0_80</jdkHome> </configuration> </toolchain> <toolchain> <type>jdk</type> <provides> <version>9</version> </provides> <configuration> <jdkHome>C:/java/jdk-9EA162/</jdkHome> </configuration> </toolchain> </toolchains> You would need to adapt it with the path to your JDK installations. Note that declared version 1.6 points to JDK 1.7. The slf4j/pom.xml requests JDK 6 by default. Comments welcome, -- Ceki