Can't POST a collection [DATAREST-315]

Zachariah Young opened DATAREST-315 and commented

I have a simple Entity with a single collection mapped.

@Entity
public class Appointment Identifiable<Integer> {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@JsonIgnore
private Integer id;

@Column(name="TRAK_NBR")
private String trackNumber;

@OneToMany(fetch =FetchType.EAGER, cascade= CascadeType.ALL)
@JoinColumn(name="CNSM_APT_VER_WRK_I", nullable = false)
private Set<Product> products = new HashSet<Product>();

}

@Entity
public class Product implements Identifiable<Integer> {

@Id
@Column(name = "CNSM_PRD_VER_WRK_I")
@GeneratedValue(strategy = GenerationType.AUTO)
@JsonIgnore
private Integer id;

@Column(name = "PRD_MDL_NBR")
private String model;

@Column(name = "PRD_SPEC_DSC")
private String description;

}

In my application when I only include a PagingAndSortingRepository for Appointment. I can call the POST command with the following payload.

{
"trackNumber" : "XYZ123",
"products": [
{"model" : "MODEL",
"description" : "NAME"
}]
}

When I add a PagingAndSortingRepository for Product and try the same POST I get the following error message.

{
"cause" : {
"cause" : {
"cause" : null,
"message" : null
},
"message" : "(was java.lang.NullPointerException) (through reference chain: com..model.Appointment["products"])"
},
"message" : "Could not read JSON: (was java.lang.NullPointerException) (through reference chain: com.model.Appointment["products"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: com.model.AppointmentVerification["products"])"
}

My GET payload with both Repositories returns this. This is my desired format. The link to products should be included

{
"trackNumber" : "XYZ123",
"_links" : {
"self" : {
"href" : "http://localhost:8080/consumerappointment/appointments/70"
},
"products" : {
"href" : "http://localhost:8080/consumerappointment/appointments/70/products"
}
}

With only the Appointment repository I get the following payload and can post the list of products.

{
"trackNumber" : "XYZ123",
"products" : [ {
"model" : "MODEL",
"description" : "NAME",
} ],
"_links" : {
"self" : {
"href" : "http://localhost:8080/consumerappointment/appointments/1"
}
}
}

Affects: 2.0.2 (Codd SR2)

Reference URL: http://forum.spring.io/forum/data-rest/749962-how-to-post-payload-with-collection?_=1402065779813