docs: private void readObject(java.io.ObjectInputStream objectInputStream)
                      throws java.io.IOException
                      , java.lang.ClassNotFoundException
      {
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
              trace.entry(this, cclass,
                          "readObject",
                          "ObjectInputStream="
                                          + objectInputStream);
  
          // Super class already handled by serilaization.
          objectInputStream.defaultReadObject();
  
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
              trace.exit(this, cclass,
                         "readObject"
                         , "via UnsupportedOperationException");
          throw new UnsupportedOperationException();
      }