JsonMappingException thrown in AmqpEventDispatcher on room deletion
arsnova-backend-core_1 | 23:39:03.820 ERROR d.t.a.event.AmqpEventDispatcher - Event serialization failed.
arsnova-backend-core_1 | com.fasterxml.jackson.databind.JsonMappingException: [no message for java.lang.NullPointerException]
arsnova-backend-core_1 | at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._wrapAsIOE(DefaultSerializerProvider.java:509)
arsnova-backend-core_1 | Caused by: java.lang.NullPointerException: null
arsnova-backend-core_1 | at de.thm.arsnova.model.serialization.FormatContentTypeIdResolver.idFromValue(FormatContentTypeIdResolver.java:36)
!335 (merged) might be related to this issue. The problem might be that Jackson expects a format to be set to correctly serialize a content.
Related: #84 (closed), !335 (merged)
Edited by Daniel Gerhardt