使用Jackson解析JSON对象的JSON数组会抛出JSON Mapping Exception，如何解决？

This is my JSON :

这是我的JSON:

    [
        {
           "_id": "574f1840d21303358a03d78b",
           "name": "Bank One of Kerala",
           "period_from": "2016-03-12T00:00:00.000Z",
           "period_to": "2016-03-12T00:00:00.000Z",
           "status": true,
           "ins": "Get an account at Bank One of Kerala :P",
           "fields": [
               {
                   "field": "Account Number",
                   "key": "acc"
               },
               {
                   "field": "IFSC",
                   "key": "ifsc"
               },
               {
                   "field": "Branch",
                   "key": "branch"
               },
               {
                   "field": "Name",
                   "key": "name"
               },
               {
                   "field": "PAN",
                   "key": "pan"
               }
          ]
    },
    {
        "_id": "574f18e4d21303358a03d78c",
        "name": "Bank Two of India",
        "period_from": "2016-03-12T00:00:00.000Z",
        "period_to": "2016-03-12T00:00:00.000Z",
        "status": true,
        "ins": "Get an account at Bank Two of India",
        "fields": [
            {
                "field": "Account Number",
                "key": "acc"
            },
            {
                "field": "IFSC",
                "key": "ifsc"
            },
            {
                "field": "Branch",
                "key": "branch"
            },
            {
                "field": "Name",
                "key": "name"
            }
    ]
  }
]
    [
        {