SimpleJPARepository: existsById() throws NPE if metadata is null

[patdlanger]

Hi there,
I guess this is somewhat related to #2716

In existsById() there is no null-check so it can produce NPEs when trying to access metadata.getComment()

[schauder]

Please provide a Minimimal Reproducable Example, preferable as a Github repository. Make sure to include the database, either as an in memory database or if that is not possible using Testcontainers.

[patdlanger]

@schauder Hi I uploaded a simple example here https://github.com/patdlanger/existsbyid

[schauder]

Thanks for reporting the issue. It's fixed and ported back to 3.0.6