Log4j Logger.getParent() inconsistent

Log4j Loggers have a getParent() method, whose return value is set up by JBossLogManagerFacade.updateParents(). The method locates the closest parent node which has an existing Log4J logger created at the time. This results in the parent being different depending on the order Log4j loggers are used in.

Consider:
Logger.getLogger("a");
Logger.getLogger("a.b.c");
Logger.getLogger("a.b");

When the second line causes updateParents() to be called, LoggerNode.getOrCreate() has already created the intermediate "a.b" node. That does not yet have a Log4j Logger created, so the Logger for "a" is returned. Original log4j would have returned "a.b" due to it using the parent structure in the implementation.