Hey guys/girls... I am starting with spring boot and kotlin... and I found some problems with hashco...

# spring

[juliocbcotta]

Hey guys/girls... I am starting with spring boot and kotlin... and I found some problems with hashcode when my entity class is a data class... is there any solution that does not involves implementing equals and hashcode by hand?

[Czar]

Hi, some problems - yes, some - no 🙂
Any specific problems?

[juliocbcotta]

As far as I could understand. When trying to access a list of entities ( data classes) through a relationship spring uses hashcode to do something and fails. I will post the stacktrace.

[juliocbcotta]

https://pastebin.com/FhpBqYdZ

[juliocbcotta]

the juice parte in the stack above is between lines 32 and 37 ... It happens when I access http://localhost:8080/users/1/trainings ... meaning a User from a Team has Trainings in Sectors

[juliocbcotta]

If I remove the data from Training class the request works fine.

[lex]

there is not full stack trace.

[lex]

I think this is typical problem with back references, hashCode method call hashCode on fields and back reference call it again recursively

[lex]

try to write it yourself without data class