ldap/src/main/java/org/springframework/security/ldap/authentication/BindAuthenticator.java
protected void handleBindException(String userDn, String username, Throwable cause) {
		if (logger.isDebugEnabled()) {
			logger.debug("Failed to bind as " + userDn + ": " + cause);
		}
	}
protected void handleBindException(String userDn, String username, Throwable cause) {
		if (logger.isDebugEnabled()) {
			logger.debug("Failed to bind as " + userDn + ": " + cause);
		}
	}
Allows subclasses to inspect the exception thrown by an attempt to bind with a
particular DN. The default implementation just reports the failure to the debug
logger.