if (url != null) {
            int pos = -1;
            while ((pos = decoded.indexOf('%', pos + 1)) >= 0) {
                if (pos + 2 < decoded.length()) {
                    String hexStr = decoded.substring(pos + 1, pos + 3);
                    char ch = (char) Integer.parseInt(hexStr, 16);
                    decoded = decoded.substring(0, pos) + ch + decoded.substring(pos + 3);
                }
            }

(such as the one for Log4J) require an external configuration file for the entire logging environment. This file should be prepared in a manner that is specific to the actual logging technology being used. Using the Logging Package APIs Use of the Logging Package APIs, from the perspective of an application component, consists of the following steps: Acquire a reference to an instance of org.apache.commons.logging.Log, by calling the factory method LogFactory.getInstance(String name). Your application...

            // mimic plexus: discard any strings containing nested XML
            while (parser.getEventType() == XmlPullParser.START_TAG) {
                final String pos = parser.getPositionDescription();
                Logs.warn("Expected TEXT, not XML: {}", pos, new Throwable());
                parser.skipSubTree();
                parser.nextTag();
            }
            return "";
        }

        try {
            return repo.getLayout().getId();
        } catch (LinkageError e) {
            /*
             * NOTE: getId() was added in 3.x and is as such not implemented by plugins compiled against 2.x APIs.
             */
            String className = repo.getLayout().getClass().getSimpleName();
            if (className.endsWith("RepositoryLayout")) {

(such as the one for Log4J) require an external configuration file for the entire logging environment. This file should be prepared in a manner that is specific to the actual logging technology being used. Using the Logging Package APIs Use of the Logging Package APIs, from the perspective of an application component, consists of the following steps: Acquire a reference to an instance of org.apache.commons.logging.Log, by calling the factory method LogFactory.getInstance(String name). Your application...

  offline mode, and then test to see if the file-based basedir for an artifact
  repository works...if it doesn't work, we can mark that repository offline...

  OTOH, all offline-mode checks can probably be run from Wagon-based APIs.

** Maven-SCM

  In all but trivial examples, SCM operations cannot complete without
  having access to the versioning server. Therefore, it is assumed that