java - Jackson ObjectMapper - readValue fails when target object has a Map field -

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i guess might have been asked earlier, not find looking for. here goes.

my json looks -

{ "verticals": [     {         "name": "vertical1",         "icon": "icon1",         "children": []     },     {         "name": "vertical2",         "icon": "icon2",         "children": []     } ], "config": {     "vertical1": [         {             "title": "section1",             "icon": "icon1",             "prefs": [                 {                     "type": "type1",                     "opts": [                         {                             "name": "pref_store_key",                             "value": "filter-prefix-food"                         }                     ],                     "icons": [                         "icon3",                         "icon4"                     ]                 },                 {                     "type": "type2",                     "opts": [                         {                             "name": "pref_store_key",                             "value": "filter-prefix-cue"                         }                     ],                     "icons": [                         "icon5",                         "icon6"                     ]                 }             ]         }     ],     "vertical2": [         {             "title": "section1",             "icon": "icon1",             "prefs": [                 {                     "type": "type1",                     "opts": [                         {                             "name": "pref_store_key",                             "value": "filter-prefix-food"                         }                     ],                     "icons": [                         "icon3",                         "icon4"                     ]                 },                 {                     "type": "type2",                     "opts": [                         {                             "name": "pref_store_key",                             "value": "filter-prefix-cue"                         }                     ],                     "icons": [                         "icon5",                         "icon6"                     ]                 }             ]         }     ] }

}

my classes -

public class featureconfigdata {     private map<string, list<itemconfig>> config = null;     private list<vertical> verticals = null;      public list<itemconfig> getitemconfig(string vertical) {         if (config == null) {             return null;         } else {             return config.get(vertical);         }     }      public list<vertical> getverticals() {         return verticals;     }      public map<string, list<itemconfig>> getconfig() {         return config;     }      public void setconfig(map<string, list<itemconfig>> config) {         this.config = config;     } }  public class itemconfig {     private string title = null;     private string icon = null;     private list<pref> prefs = null;      public static class pref {         private string type = null;         private list<string> icons = null;         private list<opt> opts = null;          public string gettype() { return type; }         public list<string> geticons() { return icons; }         public list<opt> getopts() { return opts; }     }      public static class opt {         private string name;         private string value;          public string getname() { return name; }         public string getvalue() { return value; }     }      public string gettitle() { return title; }     public string geticon() { return icon; }     public list<pref> getprefs() { return prefs; } }

i de-serializing json string -

objectmapper.configure(deserializationfeature.fail_on_unknown_properties, false)                     .enabledefaulttyping(objectmapper.defaulttyping.non_final); featureconfigdata config = objectmapper.readvalue(json, featureconfigdata.class);

why config field coming out null in case , not getting populated? need else ensure jackson understands map keys "vertical1", "vertical2" etc?

note, configuration drives actual name/number of verticals. it's not option replace map> class fields vertical1, vertical2 etc.


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