The newly added LinkCollectingAssociationHandler is throwing a MappingException due to an ambiguous association in my domain class.
The links array looks like this:
[<http://localhost:8080/rooms/2/roomGroups>;rel="roomGroups", <http://localhost:8080/rooms/2/userGroup>;rel="userGroup", <http://localhost:8080/rooms/2/room>;rel="room", <http://localhost:8080/rooms/2/originatingConferences>;rel="originatingConferences", <http://localhost:8080/rooms/2/user>;rel="user"]
And it is trying to add another 'room' relation when it throws the exception.
The issue is that it seems to be adding links to relations which I have explicitly marked with @RestResource(exported = false)
Here is an example of a relation which I believe is causing this issue:
@JsonIgnore
@RestResource(exported = false)
@OneToMany(fetch = FetchType.LAZY, mappedBy = "pk.room", cascade = {CascadeType.REMOVE})
private Set<RoomsByUserAccessView> usersThatCanDisplay = new HashSet<>();
The type RoomsByUserAccessView has an embedded id made up of a Room and a User.
I have also annotated the embedded id property with:
@JsonIgnore
@RestResource(exported = false)
private RoomsByUserAccessViewId pk = new RoomsByUserAccessViewId();
and its properties like this:
@JsonIgnore
@RestResource(exported = false)
private Room room;
@JsonIgnore
@RestResource(exported = false)
private User userWithAccess;
public RoomsByUserAccessViewId() {
//
}
How can I get it to ignore these relations properly when serializing to JSON?
My code was working prior to DATAREST-262 (https://github.com/spring-projects/spring-data-rest/commit/1d53e84cae3d09b09c4b5a9a4caf438701527550)
The full error message returned when I try to visit the rooms/ endpoint is as follows:
{
timestamp: "2014-03-17T13:38:05.481-0500"
error: "Internal Server Error"
status: 500
exception: "org.springframework.http.converter.HttpMessageNotWritableException"
message: "Could not write JSON: Detected multiple association links with same relation type! Disambiguate association @com.fasterxml.jackson.annotation.JsonIgnore(value=true) @javax.persistence.ManyToOne(fetch=EAGER, cascade=[], optional=true, targetEntity=void) @org.springframework.data.rest.core.annotation.RestResource(description=@org.springframework.data.rest.core.annotation.Description(value=), path=, exported=false, rel=) private com.renovo.schedulerapi.domain.Room com.renovo.schedulerapi.domain.RoomsByUserAccessViewId.room using @RestResource! (through reference chain: org.springframework.hateoas.PagedResources["content"]->java.util.UnmodifiableCollection[0]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Detected multiple association links with same relation type! Disambiguate association @com.fasterxml.jackson.annotation.JsonIgnore(value=true) @javax.persistence.ManyToOne(fetch=EAGER, cascade=[], optional=true, targetEntity=void) @org.springframework.data.rest.core.annotation.RestResource(description=@org.springframework.data.rest.core.annotation.Description(value=), path=, exported=false, rel=) private com.renovo.schedulerapi.domain.Room com.renovo.schedulerapi.domain.RoomsByUserAccessViewId.room using @RestResource! (through reference chain: org.springframework.hateoas.PagedResources["content"]->java.util.UnmodifiableCollection[0])"
}