StringIndexOutOfBoundsException in exceptionFormatStep

java.util.logging.ErrorManager: 5: Formatting error
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
	at java.lang.String.charAt(String.java:686)
	at org.jboss.logmanager.formatters.Formatters$12.renderExtended(Formatters.java:524)
	at org.jboss.logmanager.formatters.Formatters$12.renderRaw(Formatters.java:388)
	at org.jboss.logmanager.formatters.Formatters$JustifyingFormatStep.render(Formatters.java:150)
	at org.jboss.logmanager.formatters.MultistepFormatter.format(MultistepFormatter.java:86)
	at org.jboss.logmanager.ExtFormatter.format(ExtFormatter.java:35)
	at org.jboss.logmanager.handlers.WriterHandler.doPublish(WriterHandler.java:49)
	at org.jboss.logmanager.ExtHandler.publish(ExtHandler.java:76)
	at org.jboss.logmanager.LoggerNode.publish(LoggerNode.java:290)
	at org.jboss.logmanager.LoggerNode.publish(LoggerNode.java:298)
	at org.jboss.logmanager.LoggerNode.publish(LoggerNode.java:298)
	at org.jboss.logmanager.LoggerNode.publish(LoggerNode.java:298)
	at org.jboss.logmanager.LoggerNode.publish(LoggerNode.java:298)
	at org.jboss.logmanager.LoggerNode.publish(LoggerNode.java:298)
	at org.jboss.logmanager.LoggerNode.publish(LoggerNode.java:298)
	at org.jboss.logmanager.Logger.logRaw(Logger.java:721)
	at org.jboss.logmanager.Logger.log(Logger.java:539)

if (jarName == null) {
	// OK, that would have been too easy.  Next let's just grab the last piece before the class name
	int endIdx = path.lastIndexOf(classResourceName);
	if (endIdx != -1) {
		do {
			endIdx--;
		} while (path.charAt(endIdx) == '/' || path.charAt(endIdx) == '\\' || path.charAt(endIdx) == '?');