java使用jackson json包将json转pojo，json字符串中含有?400报错

查看到json字符串中时间部分格式如下：

{"email":"","createDate":{"date":19,"hours":0,"seconds":0,"month":4,"timezoneOffset":-480,"year":114,"minutes":0,"time":1400428800000,"day":1}}

执行转换：

    ObjectMapper objectMapper = new ObjectMapper();

    t = objectMapper.readValue(jsonStr,obj);    //obj为pojo.getClass()

报错如下：

org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of java.util.Date out of START_OBJECT token
 at [Source: java.io.StringReader@2972d68f; line: 1, column: 325]
    at org.codehaus.jackson.map.JsonMappingException.from(JsonMappingException.java:160)
    at org.codehaus.jackson.map.deser.StdDeserializationContext.mappingException(StdDeserializationContext.java:194)
    at org.codehaus.jackson.map.deser.StdDeserializer._parseDate(StdDeserializer.java:456)
    at org.codehaus.jackson.map.deser.DateDeserializer.deserialize(DateDeserializer.java:26)
    at org.codehaus.jackson.map.deser.DateDeserializer.deserialize(DateDeserializer.java:17)
    at org.codehaus.jackson.map.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:149)