Thanks a lot kukeltje, indeed i missed the fact that the parameters where commented out. But that only solved my problem partially. So also thanks to mputz. The replacement of the commons-logging.jar solved the rest of the problem! I also changed the jboss-log4j.xml a little bit so that all sql is logged into a separate file. (Based on this article: http://hibernar.org/articulos_en/logging.php) This is how my jboss-log4j.xml looks now: <?xml version="1.0" encoding="UTF-8" ?> | <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> | | <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"> | | <appender name="appenderConsole" class="org.apache.log4j.ConsoleAppender"> | <layout class="org.apache.log4j.SimpleLayout"/> | </appender> | | <appender name="appenderNormalFile" class="org.apache.log4j.RollingFileAppender"> | <param name="File" value="${jboss.server.log.dir}/normal.log"/> | <param name="Append" value="true"/> | <param name="MaxFileSize" value="500KB"/> | <param name="MaxBackupIndex" value="1"/> | <layout class="org.apache.log4j.PatternLayout"> | <param name="ConversionPattern" value="%d %-5p [%c] %m%n"/> | </layout> | </appender> | | <appender name="appenderSQLFile" class="org.apache.log4j.RollingFileAppender"> | <param name="File" value="${jboss.server.log.dir}/sql.log"/> | <param name="Append" value="true"/> | <param name="MaxFileSize" value="500KB"/> | <param name="MaxBackupIndex" value="1"/> | <layout class="org.apache.log4j.PatternLayout"> | <param name="ConversionPattern" value="%d %m%n"/> | </layout> | </appender> | | <category name="org.hibernate.SQL" additivity="false"> | <priority value="debug" /> | <appender-ref ref="appenderConsole" /> | <appender-ref ref="appenderSQLFile" /> | </category> | | <category name="org.hibernate.type" additivity="false"> | <priority value="debug" /> | <appender-ref ref="appenderConsole" /> | <appender-ref ref="appenderSQLFile" /> | </category> | | <root> | <priority value="info" /> | <appender-ref ref="appenderConsole" /> | <appender-ref ref="appenderNormalFile" /> | </root> | | </log4j:configuration> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4200923#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...