Creating a Java Object from JSON Object containing JSON Maps using GSON -

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so, i've been doing gson while, ran issue of using json maps, understand key value pairs value json object.

to give idea i'm coming from, here's json

{    "configs":[       {          "com.hp.sdn.adm.alert.impl.alertmanager":{             "trim.alert.age":{                "def_val":"14",                "desc":"days alert remains in storage (1 - 31)",                "val":"14"             },             "trim.enabled":{                "def_val":"true",                "desc":"allow trim operation (true/false)",                "val":"true"             },             "trim.frequency":{                "def_val":"24",                "desc":"frequency in hours of trim operations (8 - 168)",                "val":"24"             }          }       },       {          "com.hp.sdn.adm.auditlog.impl.auditlogmanager":{             "trim.auditlog.age":{                "def_val":"365",                "desc":"days audit log remains in storage (31 - 1870)",                "val":"365"             },             "trim.enabled":{                "def_val":"true",                "desc":"allow trim operation (true/false)",                "val":"true"             },             "trim.frequency":{                "def_val":"24",                "desc":"frequency in hours of trim operations (8 - 168)",                "val":"24"             }          }       }    ] }

all of com.hp.sdn... things dynamic, in won't know key names until runtime. figured can use hashmap , gson figure out, i'm not sure name field...

here classes have far

package com.wicomb.sdn.models.configs;  import java.util.hashmap;  import com.wicomb.sdn.types.model;  public class configresponse extends model {     private configgroup[] configs; } 
package com.wicomb.sdn.models.configs;  import com.wicomb.sdn.types.model;  public class configgroup extends model {     private hashmap<string,config> ????; }

tl;dr how should write java class let gson know how handle json property don't know name of.. , lots of them.

you can feed gson hashmap (or if children order important linkedhashmap) iterate on entries or keys other map.

in code below use following json input:

{  "test": 123,  "nested":{      "nested-1": 1,      "nested-2": 2      } }

and code looks these:

public void testgson() {     string input = "{\"test\": 123, \"nested\": {\"nested-1\": 1, \"nested-2\": 2}}";     linkedhashmap<string, object> json = new gson().fromjson(input, linkedhashmap.class);      // iterating     for(map.entry<string, object> entry : json.entryset()){         system.out.println(entry.getkey() + " -> " + entry.getvalue());     }      // testing values      system.out.println(json.get("test")); // should 123     map<string, object> nested = (map<string, object>) json.get("nested");     system.out.println(nested.get("nested-1")); // should 1     system.out.println(nested.get("nested-2")); // should 2 }

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