spring data rest - Can't POST a collection -

spring data rest - Can't POST a collection -

i have simple entity 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 application when include pagingandsortingrepository appointment. can phone call post command next payload.

{ "tracknumber" : "xyz123", "products": [ {"model" : "model", "description" : "name" }] }

when add together pagingandsortingrepository product , seek same post next 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 com.fasterxml.jackson.databind.jsonmappingexception: (was java.lang.nullpointerexception) (through reference chain: com.model.appointmentverification[\"products\"])" } payload both repositories returns this. desired format. link products should included { "tracknumber" : "xyz123", "_links" : { "self" : { "href" : "http://localhost:8080/consumerappointment/appointments/70" }, "products" : { "href" : "http://localhost:8080/consumerappointment/appointments/70/products" } }

with appointment repository next payload , can post list of products.

{ "tracknumber" : "xyz123", "products" : [ { "model" : "model", "description" : "name", } ], "_links" : { "self" : { "href" : "http://localhost:8080/consumerappointment/appointments/1" } } }

let's take step , create sure understand what's happening here: if repository detected, spring info rest exposes dedicated set of resources manage aggregates handled repository via http. thus, if have repositories multiple entities related each other, relationship represented link. why see products inlined appointmentrepository in place , products link in place 1 time create productrepository.

if want expose both repositories resources, need hand uris of product instances in payload post create appointment. means, instead of posting this:

{ "tracknumber" : "xyz123", "products": [ { "model" : "model", "description" : "name" } ] }

you'd create product first:

post /products { "model" : "model", "description" : "name" } 201 created location: …/products/4711

and hand id of product appointment payload:

{ "tracknumber" : "xyz123", "products": [ "…/products/4711" ]}

in case don't want of (no resources exposed product in first place, utilize @repositoryrestresource(exported = false) on personrepository. still leave bean instance created repo, no resources exported , resource exposed appointments inlining related products.

spring-data-rest