Log full failed authentication exception in BasicAuthenticationFilter

web/src/main/java/org/springframework/security/web/authentication/www/BasicAuthenticationFilter.java

@@ -183,7 +183,7 @@ public class BasicAuthenticationFilter extends OncePerRequestFilter {
 			SecurityContextHolder.clearContext();
 
 			if (debug) {
-				this.logger.debug("Authentication request for failed: " + failed);
+				this.logger.debug("Authentication request for failed!", failed);
 			}
 
 			this.rememberMeServices.loginFail(request, response);