Spring Boot Jackson ResponseEntity No serializer found for class

Question

I have an odd error with a spring boot controller, not returning a recently created object.

I have a controller, with 2 methods (see below). One simply retrieves an Object of the class "OrderPay" and returns it as the payload of a response entity. This works fine, the object is therefore okay.

The other one creates and persists a new instance of "OrderPay" and is then supposed to return that newly created object. The creation of the new object and its persistence work fine. However, when I try to return it, I get the error message below.

Now I would understand that error message if it occured consistently. However, when returning this newly created object using the first function ("getPaymentByIdTest"), it returns it without problems, even though I retrieve it in the exact same way from the database and return it in the same way, with the same return type of the method.

Now I know that executing the code in a HTTP-GET method is not best practise, however it is quicker and more convenient for testing.

Can anyone see where I need to adjust the code?

2020-04-13 21:37:57.507 ERROR 26796 --- [nio-8081-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.brownbag_api.model.OrderPay["posSend"]->com.brownbag_api.model.Pos$HibernateProxy$7l7MDMEi["hibernateLazyInitializer"])] with root cause

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.brownbag_api.model.OrderPay["posSend"]->com.brownbag_api.model.Pos$HibernateProxy$7l7MDMEi["hibernateLazyInitializer"])

1. The Controller

@CrossOrigin(origins = "*", maxAge = 3600)
@RestController
@RequestMapping("/api/pay")
public class PaymentController {

    @Autowired
    private OrderPayRepo orderPayRepo;

    @Autowired
    private OrderPaySvc orderPaySvc;

    @GetMapping("/{id}")
    public ResponseEntity<?> getPaymentByIdTest(@PathVariable Long id) {
        Optional<OrderPay> orderPay = orderPayRepo.findById(id);
        return ResponseEntity.ok(orderPay);
    }

    @GetMapping("/exec/from/{from}/to/{to}/amount/{amount}")
    public ResponseEntity<?> execPayment(@PathVariable Long from, @PathVariable Long to, @PathVariable double amount) {
        Pos posFrom = posRepo.getOne(from);
        Pos posTo = posRepo.getOne(to);
        OrderPay pay = orderPaySvc.createPay(amount, posFrom, posTo);
        pay = orderPaySvc.execPay(pay);

        if (pay == null) {
            return ResponseEntity.ok("Payment could not be executed. Please see log for more details!");
        } else {
            System.err.println("Payment executed: " + pay.getPosRcv().getParty().getName());
            Long payId = pay.getId();
            System.err.println("Payment executed: " + payId);
            // payId returns the expected value here, the object is therefore saved in the database (verified).
            Optional<OrderPay> orderPay = orderPayRepo.findById(payId);
            return ResponseEntity.ok(pay);
        }

    }
}

2. Order.java

@Entity
@Table(name = "order_base")
@Inheritance(strategy = InheritanceType.JOINED)
public class Order implements Serializable {

    private static final long serialVersionUID = -3458221490393509305L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID")
    private Long id;

    @NotNull
    @Column(name = "QTY")
    private double qty;

    public Order() {
    }

    public Order(@NotNull double qty) {
        super();
        this.qty = qty;
    }
}

3. OrderPay

@Entity
@Table(name = "order_pay")
public class OrderPay extends Order implements Serializable {

    private static final long serialVersionUID = 4643589803146964779L;

    @NotNull
    @OneToOne(targetEntity = Pos.class)
    @JoinColumn(name = "POS_SEND_ID")
    private Pos posSend;

    @NotNull
    @OneToOne(targetEntity = Pos.class)
    @JoinColumn(name = "POS_RCV_ID")
    private Pos posRcv;

    public OrderPay() {
        super();
    }

    public OrderPay(@NotNull double qty, @NotNull Pos posSend, @NotNull Pos posRcv) {

        super(qty);
        this.posSend = posSend;
        this.posRcv = posRcv;

    }
}

3. Pos.java

@Entity
@Table(name = "POS")
public class Pos implements Serializable {

    private static final long serialVersionUID = 1530699992135610397L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID")
    private Long id;

    @NotNull
    @Column(name = "QTY")
    private double qty;

    @NotNull
    @ManyToOne(targetEntity = Party.class)
    @JoinColumn(name = "PARTY_ID")
    @JsonBackReference
    private Party party;

    public Pos() {
    }

    public Pos(@NotNull double qty, @NotNull Party owner) {
        super();
        this.qty = qty;
        this.party = owner;
    }
}

4. JSON

{
"id":7,
"qty":33000.0,
"posSend":
  {
  "id":1,
  "qty":-266010.0,
  "hibernateLazyInitializer":{}
  },
"posRcv":
  {
  "id":2,
  "qty":66000.0,
  "hibernateLazyInitializer":{}
  }
}

Answer 1

If you are using Spring Boot, you can set the following property in application.properties file. That should solve the issue according to you stacktrace (see: "to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS")

spring.jackson.serialization.FAIL_ON_EMPTY_BEANS=false