1-5 - URL received without any parameters
CacheableFailbackRegistry.toUrlsWithoutEmpty, if there is a provider in
Collection<String>providers that does not have any parameters, the URL without any parameters will be received.
Troubleshooting and resolution steps
This error is an internal error of Dubbo. If you encounter it, you can create an Issue on github and provide the error information and steps to reproduce it. We will help you solve the problem.
see also Dubbo Community