joaohmalves commented on PR #16298:
URL: https://github.com/apache/dubbo/pull/16298#issuecomment-4573958742

   After checking a bit further, I was unable to reproduce the exact NPE from 
the stack trace (GroupServiceKeyCache.getServiceKey). 
   What I found instead is that Dubbo already detects the non-Serializable 
class in DefaultSerializeClassChecker and logs an ERROR, but does not propagate 
a clear exception. 
   
   Also as you pointed out this fix does risks swallowing unrelated exceptions 
so I would like to work on it a bit more.
   
   As this is my first contribution to this project, would it make sense for me 
to go back to the issue and ask the reporter for more details on how to 
reproduce the exact stack trace before reworking this PR?


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