my app is using axis api for some purpose, axis uses commons-logging for logging, I have jcl-over-slf4j to route commons-logging logs to slf4j and I am using log4j binding with slf4j when it attempts to make the instance it throws NullPointerException <code> Caused by: java.lang.NullPointerException at org.apache.log4j.Logger.isTraceEnabled(Logger.java:205) at org.slf4j.impl.Log4jLoggerAdapter.isTraceCapable(Log4jLoggerAdapter.java:83) at org.slf4j.impl.Log4jLoggerAdapter.<init>(Log4jLoggerAdapter.java:78) at org.slf4j.impl.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:46) at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:270) at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:156) at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:291) at org.apache.axis.components.logger.LogFactory.getLog(LogFactory.java:37) at org.apache.axis.client.Call.<clinit>(Call.java:132) <code> I am using custom Log4jLoggerFactory.java & line 46 is just constructor call with not null logger being passed on Any clue why it is not setting repository in log4j and it leaves it as null I have jcl-over-slfj4 log4j slf4j-api axis in classpath -- View this message in context: http://slf4j.42922.n3.nabble.com/commons-logging-slf4j-log4j-NullPointerExce... Sent from the slf4j - dev mailing list archive at Nabble.com.