throws Exception; private void downloadInternal(java.net.URI, java.io.File) throws Exception; private void addBasicAuthenticati(java.net.URI, java.net.URLConnection) throws java.io.IOException; private String base64Encode(String); private String calculateUserInfo(java.net.URI); private String calculateUserAgent(); } org/apache/maven/wrapper/Downloader.class package org.apache.maven.wrapper; public abstract interface Downloader { public abstract void download(java.net.URI, java.io.File) throws Exception;...