when the Get request is other than Id getting this exception :Failed to convert value of type java.lang.String to required type java.lang.Long

Question

In my SpringBoot code When i make use of Get request for user/{id} is working fine but when use of the request user/modelname.

I'm getting the exception:

Failed to convert value of type 'java.lang.String' to required type 'java.lang.Long';

carController.java

@GetMapping("/user/{id}")
    public Car getUser(@PathVariable Long id) {
        return carRepository.findOne(id);
    }

    @GetMapping("/user/modelname")
    public List<Car> searchUserByModel(@RequestBody String modelname) {
        return carRepository.findByModelname(modelname);
    }

carRepository.java

import org.springframework.data.jpa.repository.JpaRepository;


public interface CarRepository  extends JpaRepository<Car, Long>{

    public List<Car> findByModelname(String modelname);

}

car.java

@Entity
public class Car {
    @Id
    @GeneratedValue
    private Long id;
    private String modelname;
public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }
public String getModelname() {
        return modelname;
    }

    public void setModelname(String modelname) {
        this.modelname = modelname;
    }

public Car(Long id,String modelname) {
        this.id=id;
        this.modelname = modelname;
    }
@Override
    public String toString() {
        return "Car [id=" + id + ",  modelname=" + modelname +"]";
    }

    public Car() {
    }
}

Answer 1

Your request is not reaching to @GetMapping("/user/modelname") . it is always going to @GetMapping("/user/{id}") only because it satisfied the condition. Try changing the url to something else like this @GetMapping("/users/modelname") and check ,it will hit definitely.