--- org/apache/catalina/loader/WebappClassLoaderBase.java	2021-01-01 00:00:00.000000000 +0000
+++ org/apache/catalina/loader/WebappClassLoaderBase.java.new	2021-01-01 00:00:00.000000000 +0000
@@ -519,7 +519,7 @@
                 } else {
                     // File does not exist - ignore (shouldn't happen)
                 }
-            } else {
+            } else if (!"mvn".equalsIgnoreCase(protocol)) {
                 // Unsupported URL protocol
                 log.warn(sm.getString(
                         "webappClassLoader.addPermisionNoProtocol",
