title: get the size of an array using jackson
body: <p>I've the below data in a json file.</p>
  
  <pre><code>{  
     "product":"Data",
     "data":{  
        "zip":[  
           {  
              "codeValue":"12345",
              "distance":[  
                 {  
                    "5":"a c"
                 },
                 {  
                    "2":"z c"
                 }
              ]
           },
           {  
              "codeValue":"60089",
              "distance":[  
                 {  
                    "5":"a c"
                 },
                 {  
                    "2":"z c"
                 }
              ]
           }
        ]
     }
  }
  </code></pre>
  
  <p>and I'm trying to print the <code>zip</code> size using the below code.</p>
  
  <pre><code>public void getJsonResponse() throws Exception {
      String text = getTheData();
      System.out.println(text);
      ObjectMapper objMap = new ObjectMapper();
      Map&lt;String, Object&gt; map = objMap.readValue(text, new TypeReference&lt;Map&lt;String, Object&gt;&gt;() {
      });
  
      String mainMap = map.get("product").toString();
      String getData = map.get("data").toString();
      Map&lt;String, Object&gt; map1 = objMap.readValue(getData, new TypeReference&lt;Map&lt;String, Object&gt;&gt;() {
      });
      List zip = (List) map1.get("zip");
      System.out.println(zip.size());
  }
  </code></pre>
  
  <p>here instead of <code>sysout</code> on <code>zip.size()</code>, if I used <code>mainMap</code>, I get the output as <strong>Data</strong>, but when I use <code>zip.size()</code>, I get some exception as </p>
  
  <blockquote>
    <p>Exception in thread "main" com.fasterxml.jackson.core.JsonParseException: Unexpected character ('z' (code 122)): was expecting double-quote to start field name
     at [Source: java.io.StringReader@60f82f98; line: 1, column: 3]
        at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1524)
        at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:557)
        at com.fasterxml.jackson.core.base.ParserMinimalBase._reportUnexpectedChar(ParserMinimalBase.java:475)
        at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._handleOddName(ReaderBasedJsonParser.java:1293)
        at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._parseName(ReaderBasedJsonParser.java:1190)
        at com.fasterxml.jackson.core.json.ReaderBasedJsonParser.nextToken(ReaderBasedJsonParser.java:612)
        at com.fasterxml.jackson.databind.deser.std.MapDeserializer._readAndBindStringMap(MapDeserializer.java:412)
        at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:312)
        at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:26)
        at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2993)
        at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2105)
        at onlyJava.JsonDataCAll.getJsonResponse(JsonDataCAll.java:24)
        at onlyJava.Test.main(Test.java:13)</p>
  </blockquote>
  
  <p>please let me know where have I gone wrong and how can I fix this.</p>