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[英]Ways to create object of ResponseEntity class in spring boot
[英]Spring Boot Jackson ResponseEntity No serializer found for class
我有一个 spring 引导 controller 的奇怪错误,没有返回最近创建的 object。
我有一个 controller,有 2 种方法(见下文)。 只需检索 class“OrderPay”的 Object 并将其作为响应实体的有效负载返回。 这工作正常,因此 object 没问题。
另一个创建并保留“OrderPay”的新实例,然后应该返回新创建的 object。新 object 的创建及其持久性工作正常。 但是,当我尝试退回它时,我收到以下错误消息。
现在,如果它一直出现,我就会理解该错误消息。 但是,当使用第一个 function(“getPaymentByIdTest”)返回这个新创建的 object 时,它会毫无问题地返回它,即使我以完全相同的方式从数据库中检索它并以相同的方式返回它,具有相同的返回类型的方法。
现在我知道在 HTTP-GET 方法中执行代码并不是最好的做法,但是它对于测试来说更快更方便。
谁能看到我需要调整代码的地方?
2020-04-13 21:37:57.507 错误 26796 --- [nio-8081-exec-2] oac.c.C.[.[.[/].[dispatcherServlet]:Servlet.service() for servlet [dispatcherServlet]在路径 [] 的上下文中抛出异常 [请求处理失败; 嵌套异常是 org.springframework.http.converter.HttpMessageConversionException:类型定义错误:[简单类型,class org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor]; 嵌套的异常是 com.fasterxml.jackson.databind.exc.InvalidDefinitionException:没有找到 class org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor 的序列化程序(以避免创建 BeanSerialization_EMFYANFeature 异常)参考链:com.brownbag_api.model.OrderPay["posSend"]->com.brownbag_api.model.Pos$HibernateProxy$7l7MDMEi["hibernateLazyInitializer"])] 具有根本原因
com.fasterxml.jackson.databind.exc.InvalidDefinitionException:没有找到用于 class org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor 的序列化器,并且没有发现用于创建 BeanSerializer 的属性(以避免异常,禁用 exception_EM_PTAIL 链) com.brownbag_api.model.OrderPay["posSend"]->com.brownbag_api.model.Pos$HibernateProxy$7l7MDMEi["hibernateLazyInitializer"])
@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);
}
}
}
@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;
}
}
@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;
}
}
@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;
}
}
{
"id":7,
"qty":33000.0,
"posSend":
{
"id":1,
"qty":-266010.0,
"hibernateLazyInitializer":{}
},
"posRcv":
{
"id":2,
"qty":66000.0,
"hibernateLazyInitializer":{}
}
}
如果您使用的是 Spring Boot,您可以在application.properties文件中设置以下属性。 根据您的堆栈跟踪,这应该可以解决问题(请参阅:“为避免异常,禁用 SerializationFeature.FAIL_ON_EMPTY_BEANS”)
spring.jackson.serialization.FAIL_ON_EMPTY_BEANS=false
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