JBoss Logging does not detect log4j 2.0 --------------------------------------- Key: JBLOGGING-94 URL: https://issues.jboss.org/browse/JBLOGGING-94 Project: JBoss Logging Issue Type: Bug Security Level: Public(Everyone can see) Components: jboss-logging-log4j Affects Versions: 3.1.2.GA Environment: Hibernate Reporter: Henry Clout Assignee: James Perkins The class org.jboss.logging.LoggerProviders checks for the presence of log4j using the code: {code} private static LoggerProvider tryLog4j(final ClassLoader cl) throws ClassNotFoundException { Class.forName("org.apache.log4j.LogManager", true, cl); // JBLOGGING-65 - slf4j can disguise itself as log4j. Test for a class that slf4j doesn't provide. Class.forName("org.apache.log4j.Hierarchy", true, cl); return new Log4jLoggerProvider(); } {code} However, despite having the log4j-1.2-api-2.0.jar bridge included, this fails as the class org.apache.log4j.Hierarchy is not present in log4j 2.0. I worked around this by forcing JBoss logging to use slf4j (which is then proxied to log4j) by setting the -Dorg.jboss.logging.provider=slf4j option. As a proper fix, however, how about checking for a class that is included in log4j 1.2, 2.0 but not slf4j? org.apache.log4j.config.PropertySetter seems to tick the box. I tested changing the afore mentioned method to: {code} private static LoggerProvider tryLog4j(final ClassLoader cl) throws ClassNotFoundException { Class.forName("org.apache.log4j.LogManager", true, cl); // JBLOGGING-65 - slf4j can disguise itself as log4j. Test for a class that slf4j doesn't provide. Class.forName("org.apache.log4j.config.PropertySetter", true, cl); return new Log4jLoggerProvider(); } {code} And indeed I started receiving logging messages from Hibernate (via JBoss logging.)