java - Jersey serialize empty list and single element list as an array -

since there probelm serialization emplty list , single element list in jersey. tried fix adding jaxbcontextresolver class. goal return json object thant contains json array android application in cases (if returns 0 element or 1 element or more 1). json data don't same. , error in android application expected begin_object begin_array appreciate help. in advance

@provider     public class jaxbcontextresolver implements contextresolver<jaxbcontext> {         private jaxbcontext context;         private final set<class> types;          // pojo class         private class[] ctypes = { workitem.class, project.class, user.class };          public jaxbcontextresolver() throws exception {             naturalbuilder builder = jsonconfiguration.natural();             //assure rootelement name appears in json structure             builder.rootunwrapping(false);              this.types = new hashset(arrays.aslist(ctypes));             // json configuration             this.context = new jsonjaxbcontext(builder.build(), ctypes);         }          @override         public jaxbcontext getcontext(class<?> objecttype) {             return (types.contains(objecttype)) ? context : null;         }      } 

my json data when set builder.rootunwrapping(true);

[     {         "assignedto": "assignee1",         "businesskey": "key1",         "createdby": "createdby1",         "description": "description1"     } ] 

but want solve problem in android side :

{     "project": [         {             "assignedto": "assignee1",             "businesskey": "key1",             "createdby": "createdby1",             "description": "description1"         }     ] } 

i added @jsonrootname(value = "project") my project class in order fix problem error don't khow how solve please need

multiple markers @ line     - jsonrootname cannot resolved type     - attribute value undefined annotation type jsonrootname 

my project class :

@xmlrootelement @jsonrootname(value = "project")  public class project implements serializable {      private static final long serialversionuid = 1l;       private string description;     private string businesskey;     private string createdby;         private string assignedto;      public project() {     } // getter , setter method  } 

try change annotation of project class as

@jsonrootname(value = "rootname")