http://bugzilla.slf4j.org/show_bug.cgi?id=168 Summary: Category.log(String FQCN, Priority p, Object msg, Throwable t) method throws UnsupportedOperationException Product: SLF4J Version: 1.5.x Platform: PC OS/Version: Windows NT Status: NEW Severity: major Priority: P1 Component: log4j-over-slf4j AssignedTo: slf4j-dev@qos.ch ReportedBy: listid@qos.ch Seth Call reports: http://www.qos.ch/pipermail/slf4j-user/2010-February/000889.html It appears that but not certain that a logback appender is invoking a library using log4j during its initialization which retrieves a NOPLogger. See http://www.qos.ch/pipermail/slf4j-user/2010-February/000892.html Solution is to change the Category.log(String FQCN, Priority p, Object msg, Throwable t) method from public void log(String FQCN, Priority p, Object msg, Throwable t) { int levelInt = priorityToLevelInt(p); differentiatedLog(null, FQCN, levelInt, msg, t); } public void log(String FQCN, Priority p, Object msg, Throwable t) { int levelInt = priorityToLevelInt(p); if (locationAwareLogger != null) { locationAwareLogger.log(null, FQCN, levelInt, convertToString(msg), t); } else { throw new UnsupportedOperationException("The logger [" + slf4jLogger + "] does not seem to be location aware."); } } -- Configure bugmail: http://bugzilla.slf4j.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug.