Exception in thread "Thread-1" java.lang.NullPointerException
at org.apache.log4j.LogManager.getLoggerRepository(LogManager.java:168)
at org.apache.log4j.xml.XMLWatchdog.doOnChange(DOMConfigurator.java:861)
at org.apache.log4j.helpers.FileWatchdog.checkAndConfigure(FileWatchdog.java:88)
at org.apache.log4j.helpers.FileWatchdog.run(FileWatchdog.java:107)