java ee - Customize serialization of a list of JAXB objects to JSON? -

i planning serialize list of jaxb objects json response. below format getting. in below response seeing 1 more object in between "systeminfolist" showing array. instead want dependent_systems_infos should directly show array []. if there single system info response still should should show in array format. using jackson parser, cxf.

format getting:

{     "dependent_systems_infos":{         "systeminfolist":[             {             "system_name":"pz_service",             "system_type":"internal",             "service_infos":[                {                   "service_name":"getpzattributes",                   "status":"down",                   "response_time_ms":50                }             ]          },          {             "system_name":"oms",             "system_type":"external",             "service_infos":[                {                   "service_name":"createorder",                   "status":"up",                   "response_time_ms":2000                },                {                   "service_name":"cancelorder",                   "status":"up",                   "response_time_ms":500                }             ]          }       ]    } } 

format need:

{   dependent_system_infos : [        {         system_name : 'oms'         system_type: 'external'         services_infos: [                    {                   service_name : 'createorder'                       status : 'up'                   response_time_ms : 2000                },            {               service_name : 'cancelorder'                       status : 'up'                   response_time_ms : 2000            }          ]       },       {         system_name : 'pz_service'         system_type: 'internal'         services_infos: [                    {                   service_name : 'getpzattributes'                       status : 'up'                   response_time_ms : 2000                }          ]       }   ] } 

jaxb classes wrote:

@xmlrootelement(name = "dependent_systems_infos") @xmlaccessortype(xmlaccesstype.field) public class itinerarystatusresponse {      private list<systeminfo> systeminfolist;      @xmllist     public list<systeminfo> getsysteminfolist() {         return systeminfolist;     }      public void setsysteminfolist(list<systeminfo> systeminfolist) {         this.systeminfolist = systeminfolist;     }  }  @xmltype(proporder = {         "systemname",         "systemtype",         "serviceinfolist" }) @xmlaccessortype(xmlaccesstype.field) public class systeminfo {      @xmlelement(name = "system_name", required = true)     protected systemname systemname;      @xmlelement(name = "system_type", required = true)     protected systemtype systemtype;      @xmlelement(name = "service_infos", required = true)     protected list<serviceinfo> serviceinfolist;  } 

it know how you're generating output, main issue serializing root object contains list when want serialize list itself. expect outputted list if itinerarystatusresponse had other fields in it?

you can remove @xmlrootelement annotation , mark list element named "dependent_systems_infos":

@xmlaccessortype(xmlaccesstype.field) public static class itinerarystatusresponse {    private list<systeminfo> systeminfolist;    @xmlelement(name = "dependent_systems_infos", required = true)   public list<systeminfo> getsysteminfolist() {     return systeminfolist;   }    public void setsysteminfolist(list<systeminfo> systeminfolist) {     this.systeminfolist = systeminfolist;   } } 

if doing serialization yourself, approach drop itinerarystatusresponse object entirely (since it's wrapper around list), , serialize list serializationfeature.wrap_root_value = true , root name provide:

objectmapper mapper = new objectmapper(); mapper.configure(serializationfeature.wrap_root_value, true);  annotationintrospector introspector = new jaxbannotationintrospector(typefactory.defaultinstance()); mapper.setannotationintrospector(introspector);  objectwriter writer = mapper.writerwithdefaultprettyprinter().withrootname("dependent_systems_infos"); system.out.println(writer.writevalueasstring(systeminfolist)); 

both of these approaches provide desired output in testing jackson 2.2.