How to enable wire level loggers/debug loggers.

Enable/set the following properties in ESB_HOME/repository/conf/log4j.properties to enable wire level loggers/debug loggers.

log4j.logger.org.apache.synapse.transport.nhttp.headers=DEBUG
log4j.logger.org.apache.synapse.transport.nhttp.wire=DEBUG
log4j.logger.org.apache.synapse.transport.passthru.headers=DEBUG
log4j.logger.org.apache.synapse.transport.passthru.wire=DEBUG
log4j.logger.org.apache.axis2.transport.mail=DEBUG