code: protected static Factory createConfiguredFactory ()
      {
          String implClass;
          try {
              implClass = System.getProperty("com.samskivert.util.Log");
          } catch (SecurityException se) {
              // in a sandbox
              return null;
          }
          if (!StringUtil.isBlank(implClass)) {
              try {
                  return (Factory)Class.forName(implClass).newInstance();
              } catch (Throwable t) {
                  System.err.println("Unable to instantiate logging implementation: " + implClass);
                  t.printStackTrace(System.err);
              }
          }
          return null;
      }
docs: A helper function for {@link #initLogger}.