log4j 2 suport error

LogFactory suport jdk log,log4j,log4j 2,but useing code like this:
USE_JDK_LOGGER=isPropertySet(Global.USE_JDK_LOGGER);
IS_LOG4J_AVAILABLE=isAvailable("org.apache.log4j.Logger");
IS_LOG4J2_AVAILABLE=isAvailable("org.apache.logging.log4j.core.Logger");

initialize var flag,
the isAvailable function depend on ClassNotFoundException ,when useing log4j 2 Log4j 1.x bridge, has org.apache.log4j.Logger class ,then exception is not ClassNotFoundException ,change isAvailable cunction to:

protected static boolean isAvailable(String classname) {
try

{ return Class.forName(classname) != null; }

catch(Exception cnfe)

{ return false; }

}