com.fasterxml.jackson.databind.JsonMappingException:No suitable constructor found for type

1.有可能是反序列的类确实没有默认构造方法，检查一下。

2.因为我遇到的问题不属于1的情况（最后发现是内部类的问题），首先我是建立了这样一个类，作用是作一个序列化和反序列化的测试：

public class Test {

@org.junit.Test
public void main() throws Exception {
Seiral seiral = new Seiral();
seiral.setId("1");
seiral.setName("hhh");
ObjectMapper mapper = new ObjectMapper();
String ooo = mapper.writeValueAsString(seiral);
System.out.println(ooo);
Seiral ss = mapper.readValue(ooo, Seiral.class);
System.out.println(ss);
}

public class Seiral implements Serializable {

private static final long serialVersionUID = 1L;

private String id;
private transient String name;

public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}

@Override
public String toString() {
return "id:" + id + ", name:" + name;
}

}

然后运行之后发现这个错误

com.fasterxml.jackson.databind.JsonMappingException: No suitable constructor found for type [simple type, class com.bonc.vbap.data.dataset.Test$Seiral]: can not instantiate from JSON object (missing default constructor or creator, or perhaps need to add/enable type information?)
at [Source: {"id":"11111","name":"test"}; line: 1, column: 2]
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:148)
.....

说是反序列化的类没有constructor 或者 creator，然后我把内部类单独放到外面，新建一个类，这个问题就没有了，具体是什么原因我也没有深究。