jackson "no suitable constructor found" Exception

使用jackson做反序列化的时候, 可能会报类似的错误:

com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of test.jackson.case6.case5.ParseTest$SolidBean: no suitable constructor found, can not deserialize from Object value (missing default constructor or creator, or perhaps need to add/enable type information?)

这是因为对象没有默认构造函数.
最简单的做法当然是加入一个无参构造函数, 但是有的时候我们无法修改目标对象, 这里有个解决方法, 扩展类并且使用@JsonProperty, 测试用例如下:(使用了lombok)

public class ParseTest {

    @Test
    public void parseTest() throws IOException {
        SolidBean solidBean = new SolidBean("content");

        ObjectMapper objectMapper = new ObjectMapper();
        String json = objectMapper.writeValueAsString(solidBean);

        System.out.println(json);

        SolidBean deserialized = objectMapper.readValue(json, ExtendBean.class);

        System.out.println(deserialized);
    }

    @Data
    @AllArgsConstructor
    public static class SolidBean {
        String content;
    }

    @Data
    @EqualsAndHashCode(callSuper = true)
    @ToString(callSuper = true)
    public static class ExtendBean extends SolidBean {
        public ExtendBean(@JsonProperty("content") String content) {
            super(content);
        }
    }

}