Apache log4j

Users that want to use the Apache log4j package and let Guice injects automagically org.apache.log4j.Logger instances, have to add the following dependency in the pom.xml:

<dependency>
    <groupId>com.google.code.sli4j</groupId>
    <artifactId>sli4j-log4j</artifactId>
    <version>XX.XX</version>
    <scope>compile</scope>
</dependency>

then, when creating the com.google.inject.Injector, add the com.google.code.sli4j.log4j.Log4jLoggingModule module; please take note that users have to specify the classes com.google.inject.matcher.Matcher for whom the logging injection has to be applied:

import com.google.inject.Guice;
import com.google.inject.Injector;

import com.google.code.sli4j.log4j.Log4jLoggingModule;
import com.google.inject.matcher.Matchers;

...

Injector injector = Guice.createInjector(new Log4jLoggingModule(Matchers.any()),
    ...
);

and the magic happens :)