docs: public boolean destinationExists(JsDestinationAddress addr) throws SIMPNullParameterException
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(tc, "destinationExists", new Object[] { addr });
  
          // Now look for the destination in the hash table
          boolean exists = destinationExists(addr.getDestinationName(), addr.getBusName());
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(tc, "destinationExists", new Boolean(exists));
  
          return exists;
      }