code: @SuppressWarnings("unchecked")
  	public static synchronized @CheckForNull Map<String,String> getPersistedInstallStatus() {
          File installingPluginsFile = getInstallingPluginsFile();
          if(installingPluginsFile == null || !installingPluginsFile.exists()) {
  		return null;
          }
          return (Map<String,String>)new XStream().fromXML(installingPluginsFile);
      }
docs: Returns a list of any plugins that are persisted in the installing list