Support validation of properties on refresh

I am using spring cloud configuration.

I have a property bean annotated with @RefreshScope, it keeps my dynamic properties, it refreshes my applicationContext using ContextRefresher after noticing my properties changed, I found that when new properties invalid, it can also refreshes successfully, but when I used this property bean, it throwed a exception with message "error creating a bean with name 'xxx'".

I looked up source code and found the reason, when ContextRefresher refreshed, beans in refresh scope will be destroyed, new bean will not be created immediately because of lazyInit. It created when I first used it, and then spring resolved new properties failed, leads to new bean create fail, so I got the exception. And worse, every time I use it, it is created again and the exception occurs again.

I hope that it could fallback to old properties bean when new properties is invalid.

Sorry for my poor English, Looking forward to your reply.

Thanks.

Start by reading ContextRefresher and the @RefreshScope lifecycle described in the report, focusing on destruction, lazy creation, and validation of refreshed properties. Reproduce the invalid-property case and trace repeated bean creation failures. Done means an invalid refresh does not discard the previously valid property bean, with tests covering the refresh and subsequent access.