During the last hours I read many StackOverflow questions and articles, but none of the advices helped. What I tried:
- Add @JsonCreator and @JsonProperty to both Person and Employee classes (link)
- Add @JsonDeserialize(using = EmployeeDeserialize.class) to Employee class (link)
- Add Lombok as dependency, set lombok.anyConstructor.addConstructorProperties=true and add @Data / @Value annotation to both Person and Employee classes (link)
Finally, I did the deserialization manually:
String json = "{\"name\": \"Unknown\",\"email\": \"[email protected]\",\"salary\":1}"; ObjectMapper objectMapper = new ObjectMapper(); Employee employee = objectMapper.readValue(json, Employee.class);
In this way I could deserialize the JSON, but as soon as I started my spring-boot-starter-web project and called
http://localhost:8080/print?name=unknown&[email protected]&salary=1
I got the good old BeanInstantiationException
Failed to instantiate [Employee]: No default constructor found
I run out of ideas. Does anybod know why this worked when I did the deserialization manually? And why it throws exception when I call the REST endpoint?
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
@RestController
public class EmployeeController {
@GetMapping("print")
public void print(Employee employee) {
System.out.println(employee);
}
}
public class Person {
private final String name;
@JsonCreator
public Person(@JsonProperty("name") String name) {
this.name = name;
}
public String getName() {
return name;
}
}
public class Employee extends Person {
private final String email;
private final int salary;
@JsonCreator
public Employee(
@JsonProperty("name") String name,
@JsonProperty("email") String email,
@JsonProperty("salary") int salary) {
super(name);
this.email = email;
this.salary = salary;
}
public String getEmail() {
return email;
}
public int getSalary() {
return salary;
}
}
