java - Jackson seemingly not persisting bidirectional relationship managed by Hibernate -

i'm having trouble figuring out why owning side of relationship isn't getting persisted on other side when post json object rest api (using spring , hibernate).

mapped superclass id field:

@mappedsuperclass public class baseentity implements serializable {     private static final long serialversionuid = 11538918560302121l;     @id     @generatedvalue(strategy = generationtype.identity)     private int id;     ....     } 

owning class (extends namedentity in turn extends baseentity):

@entity @dynamicupdate @selectbeforeupdate @namedquery(name = "chain.byid", query = "from chain id=:id") @jsonidentityinfo(generator = objectidgenerators.propertygenerator.class, property = "id", scope=chain.class) public class chain extends namedentity {     private static final long serialversionuid = 4727994683438452454l;     @onetomany(mappedby = "chain", fetch = fetchtype.eager, cascade = cascadetype.all)     private list<campaign> campaigns = new arraylist<campaign>();     .... } 

owned class:

@entity @dynamicupdate @selectbeforeupdate @namedquery(name = "campaign.byid", query = "from campaign id=:id") @jsonidentityinfo(generator = objectidgenerators.propertygenerator.class, property = "id", scope=campaign.class) public class campaign extends namedentity {     @manytoone     @joincolumn(name = "chain_id")     private chain chain;     .... } 

the relevant part of restcontroller:

@requestmapping(value = "new", method = requestmethod.post, consumes = "application/json", produces = "application/json") @responsebody public chain savechain(@requestbody chain chain) {     chaindao.savechain(chain);     return chain; } 

json request body:

{     "name": "mcdonald's",   "campaigns": [       {           "name": "summer1"       }   ] } 

relevant part of json response body:

{   "id": 1,   "name": "mcdonald's",   "campaigns": [     {       "id": 1,       "name": "summer1",       "rewards": [],       "startdate": null,       "enddate": null,       "chain": null,       "surveys": [],       "achievements": []     }   ],   "rewards": [] } 

i suspect expected behaviour when using @jsonidentityinfo annotation break infinite recursion? however, when try request chain created id field, don't see nested object (campaign) anymore.

get method used retrieve chain object created:

@requestmapping(value = "{id}", method = requestmethod.get, produces = "application/json") @responsebody public chain getchain(model model, @pathvariable int id) {     chain chain = chaindao.getchainbyid(id).get(0);     return chain; } 

json response body method:

{   "id": 1,   "name": "mcdonald's",   "campaigns": [],   "rewards": [],   "managers": [],   "locations": [] } 

as can see, campaigns array in chain object empty.

turns out wasn't managing bidirectional relationship properly. relationship must explicitly set on both ends.

@requestmapping(value = "{id}/campaigns/new", method = requestmethod.post, consumes = "application/json", produces = "application/json")     @responsebody     public campaign savecampaigntochain(@requestbody campaign campaign, @pathvariable int id) {         chain chain = chaindao.getchainbyid(id).get(0);         chain.getcampaigns().add(campaign);         campaign.setchain(chain);         chaindao.savechain(chain);         campaigndao.savecampaign(campaign);         return campaign;     }