Hello Russell, The logback projects consists of 3 modules: logback-core, logback-classic and logback-access. There is also the logback-audit module but which is commercial (not open-source). All modules depend on logback-core. Logback-access module depends on logback-core. It integrates with Tomcat and Jetty. So it requires any the two to be useful. Logback-classic module depends on logback-core and on slf4j-api. The logback distribution bundles slf4j-api.jar under logback-examples/lib. However, your can obtain slf4j from http://www.slf4j.org/download.html The pom.xml file you mention has a *dependencyManagement* section which declares slf4j. However, the dependencyManagement is used to fix the *version* of a dependency for all modules. It does *not* declare a dependency. In logback-classic/pom.xml there is indeed a dependency declaration on log4j-over-slf4j but which is in the *test* scope. It is only used for testing purposes. In other words, you don't need log4j to use logback. You should not confuse logback-access and logback-classic. There serve different purposes. To answer your question, logback-access does not depend on SLF4J. (You are only interested in logback-access, right?) HTH, Russell E Glaue wrote:
Really?
http://www.slf4j.org/ - SLF4J API offers an advanced abstraction of various logging systems, including ... logback. ... Logging systems can either choose to implement the the SLF4J interfaces directly, e.g. logback or ... -
So what then is the relationship between logback and slf4j ?
When my team has investigated the POM files for logback, we see dependency on log4j libraries.
The latest POM in trunk show a dependency on slf4j 1.5.6 http://svn.qos.ch/viewvc/logback/trunk/pom.xml?revision=2114 - ... <properties> − <!-- slf4j.version property is used below and in setClasspath.cmd --> <slf4j.version>1.5.6</slf4j.version> <consolePlugin.version>1.1.0</consolePlugin.version> </properties> ... <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j.version}</version> </dependency> ... -
Are the slf4j libraries compiled into and bundled with the logback distribution?
-RG
-- Ceki Gülcü Logback: The reliable, generic, fast and flexible logging framework for Java. http://logback.qos.ch