question: private synchronized void initResourceBundle ( String resourceBundleName ) { String current = this . resourceBundleName ; if ( current != null ) { if ( current . equals ( resourceBundleName ) ) { return ; } else { throw new IllegalArgumentException ( "Resource bundle name '" + resourceBundleName + "' is inconsistent with the existing '" + current + "'" ) ; } } if ( resourceBundleName != null ) { this . resourceBundle = loadResourceBundle ( resourceBundleName ) ; this . resourceBundleName = resourceBundleName ; } }
target:  Initializes this logger's resource bundle.