json - JSONParser doesn't work in Android -

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this type of json object coming android device :

{"successful":true,"value":{"materials":[{"materialid":999999,"type":1,"stockno":1,"weight":1}]}}

i'm trying parse : 

public string parsematerial(jsonobject object){ try{     jsonarray objectarray = object.getjsonarray("value");     } catch(jsonexception e){     log.d("jsonparser=>error", e.getmessage());     } }

what in logcat :

d/jsonparser=>error: value:{"materials":[{"materialid":999999,"type":1,"stockno":1,"weight":1}]}

what doing wrong here? why program fall in catch block? thanks.

cause value not json array


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