Logger.setLevel(null) will throw an NPE if the logger in question previously has a non-null level -------------------------------------------------------------------------------------------------- Key: LBCLASSIC-83 URL: http://jira.qos.ch/browse/LBCLASSIC-83 Project: logback-classic Issue Type: Bug Components: Other Affects Versions: 0.9.9, 0.9.10, 0.9.11, 0.9.12 Reporter: Ceki Gulcu Assignee: Ceki Gulcu Priority: Blocker Fix For: 0.9.12 This bug causes LBCLASSIC-79 as symptom. To reproduce Logger logger = LoggerFactory.getLogger("x"); logger.setLevel(Level.DEBUG) logger.setLevel(null); // throws NPE -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://jira.qos.ch/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira