ED2 KC- Null key for a Map not allowed in JSON
ERROR 2021-12-07T13:30:44,423 com.fasterxml.jackson.databind.JsonMappingException: Null key for a Map not allowed in JSON (use a converting NullKeySerializer?) (through reference chain: java.util.HashMap["userGroupAccesses"]->java.util.ArrayList[0]->java.util.HashMap["null"])
The key for a userGroupAccesses object is getting lost somewhere along the way. It is likely a bug in DHIS2 caused by external factors/configuration.
I’ve seen this alongside APPARENT DEADLOCK errors and it leads me to believe it is a resource constraint issue. However it could be a chicken and the egg situation (is it that resources are too low or is that a bug/config is consuming all of the resources or available?)