SpringBoot 将数据存储在 h2 中，但无法检索数据并在浏览器或邮递员中以 JSON 格式显示

我连续两天在互联网上做了很多研究，但不明白发生了什么。

在我的个人项目中，我有一个付款和账单实体。付款可以包含多个账单(一对多(，但账单只能包含一个付款(多对一(。

数据存储在 H2 数据库中很好，但是当我以 JSON 格式返回数据时，它什么也没显示！

这是我在stackoverflow中的第一个问题，如果我犯了任何错误，请纠正我。任何建议都会有所帮助。

聚甲醛.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example.HospitalManagementSystem</groupId>
<artifactId>HospitalManagementSystem</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>HospitalManagementSystem</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.tomcat/tomcat-jasper -->
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-jasper</artifactId>
<version>8.5.31</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.tomcat.embed/tomcat-embed-jasper -->
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.dataformat/jackson-dataformat-xml -->
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-xml</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

付款.java

package com.example.HospitalManagementSystem.HospitalManagementSystem.Model;
import lombok.Data;
import org.springframework.beans.factory.annotation.Autowired;
import javax.persistence.*;
import javax.validation.constraints.NotNull;
import java.util.HashSet;
import java.util.Set;

@Entity
public class Payment {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
//private int Amount;
@Column
private String Type;
@OneToMany(mappedBy = "payment", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
private Set<Bill> Bills;
public Payment() {
}
public Payment(String Type) {
this.Type=Type;
}
}

比尔.java

package com.example.HospitalManagementSystem.HospitalManagementSystem.Model;

import com.fasterxml.jackson.annotation.JsonBackReference;
import javax.persistence.*;
@Entity
public class Bill {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
@Column
private String Amount;
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "payment_id")
@JsonBackReference
private Payment payment;
public Bill() {
}
public Bill(String Amount){
//this.id=BillId;
this.Amount=Amount;
}
public Bill(String amount, Payment payment) {
Amount = amount;
this.payment = payment;
}
}

比尔回购.java

package com.example.HospitalManagementSystem.HospitalManagementSystem.Repository;
import com.example.HospitalManagementSystem.HospitalManagementSystem.Model.Bill;
import org.springframework.data.jpa.repository.JpaRepository;
public interface BillRepo extends JpaRepository<Bill, Integer> {
}

付款回购.java

package com.example.HospitalManagementSystem.HospitalManagementSystem.Repository;
import com.example.HospitalManagementSystem.HospitalManagementSystem.Model.Payment;
import org.springframework.data.jpa.repository.JpaRepository;
public interface PaymentRepo extends JpaRepository<Payment, Integer> {
}

我的控制器.java

package com.example.HospitalManagementSystem.HospitalManagementSystem.Controller;
import com.example.HospitalManagementSystem.HospitalManagementSystem.Model.Bill;
import com.example.HospitalManagementSystem.HospitalManagementSystem.Model.Payment;
import com.example.HospitalManagementSystem.HospitalManagementSystem.Repository.BillRepo;
import com.example.HospitalManagementSystem.HospitalManagementSystem.Repository.PaymentRepo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
public class myController {
@Autowired
PaymentRepo paymentRepo;
@Autowired
BillRepo billRepo;
@GetMapping("/welcome")
public void enterData(){
Payment p1=new Payment("abc");
Payment p2=new Payment("abc");
Payment p3=new Payment("abc");
paymentRepo.save(p1);
paymentRepo.save(p2);
paymentRepo.save(p3);
Bill b1=new Bill("100", p1);
Bill b2=new Bill("200", p1);
Bill b3=new Bill("300", p2);
billRepo.save(b1);
billRepo.save(b2);
billRepo.save(b3);
}

@GetMapping("/goodbye")
public List<Bill> getData(){
List<Payment> paymentList=paymentRepo.findAll();
List<Bill> billList=billRepo.findAll();
System.out.println("<----------------- Payment List ------------------>  " + paymentList.size());
paymentList.forEach(System.out::println);
System.out.println("<----------------- Bill List ------------------>  " + billList.size());
billList.forEach(System.out::println);
return billList;
}
}

图1：账单表在此处输入图像描述

图2：付款表在此处输入图像描述

图3：邮递后未显示任何数据在此处输入图像描述在此处输入代码

最后是控制台日志：

org.springframework.http.ResponseEntity<org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.followPropertyReference(org.springframework.data.rest.webmvc.RootResourceInformation,java.io.Serializable,java.lang.String,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler) throws java.lang.Exception
2018-08-15 15:44:04.526  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}/{property}/{propertyId}],methods=[GET],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.followPropertyReference(org.springframework.data.rest.webmvc.RootResourceInformation,java.io.Serializable,java.lang.String,java.lang.String,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler) throws java.lang.Exception
2018-08-15 15:44:04.526  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}/{property}],methods=[DELETE],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<? extends org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.deletePropertyReference(org.springframework.data.rest.webmvc.RootResourceInformation,java.io.Serializable,java.lang.String) throws java.lang.Exception
2018-08-15 15:44:04.527  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}/{property}],methods=[GET],produces=[application/x-spring-data-compact+json || text/uri-list]}" onto public org.springframework.http.ResponseEntity<org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.followPropertyReferenceCompact(org.springframework.data.rest.webmvc.RootResourceInformation,java.io.Serializable,java.lang.String,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler) throws java.lang.Exception
2018-08-15 15:44:04.527  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}/{property}],methods=[PATCH || PUT || POST],consumes=[application/json || application/x-spring-data-compact+json || text/uri-list],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<? extends org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.createPropertyReference(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.http.HttpMethod,org.springframework.hateoas.Resources<java.lang.Object>,java.io.Serializable,java.lang.String) throws java.lang.Exception
2018-08-15 15:44:04.527  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}/{property}/{propertyId}],methods=[DELETE],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController.deletePropertyReferenceId(org.springframework.data.rest.webmvc.RootResourceInformation,java.io.Serializable,java.lang.String,java.lang.String) throws java.lang.Exception
2018-08-15 15:44:04.528  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/ || ],methods=[OPTIONS],produces=[application/hal+json || application/json]}" onto public org.springframework.http.HttpEntity<?> org.springframework.data.rest.webmvc.RepositoryController.optionsForRepositories()
2018-08-15 15:44:04.529  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/ || ],methods=[HEAD],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<?> org.springframework.data.rest.webmvc.RepositoryController.headForRepositories()
2018-08-15 15:44:04.529  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/ || ],methods=[GET],produces=[application/hal+json || application/json]}" onto public org.springframework.http.HttpEntity<org.springframework.data.rest.webmvc.RepositoryLinksResource> org.springframework.data.rest.webmvc.RepositoryController.listRepositories()
2018-08-15 15:44:04.531  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/search],methods=[OPTIONS],produces=[application/hal+json || application/json]}" onto public org.springframework.http.HttpEntity<?> org.springframework.data.rest.webmvc.RepositorySearchController.optionsForSearches(org.springframework.data.rest.webmvc.RootResourceInformation)
2018-08-15 15:44:04.532  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/search/{search}],methods=[GET],produces=[application/x-spring-data-compact+json]}" onto public org.springframework.hateoas.ResourceSupport org.springframework.data.rest.webmvc.RepositorySearchController.executeSearchCompact(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.http.HttpHeaders,org.springframework.util.MultiValueMap<java.lang.String, java.lang.Object>,java.lang.String,java.lang.String,org.springframework.data.rest.webmvc.support.DefaultedPageable,org.springframework.data.domain.Sort,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler)
2018-08-15 15:44:04.532  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/search],methods=[HEAD],produces=[application/hal+json || application/json]}" onto public org.springframework.http.HttpEntity<?> org.springframework.data.rest.webmvc.RepositorySearchController.headForSearches(org.springframework.data.rest.webmvc.RootResourceInformation)
2018-08-15 15:44:04.532  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/search],methods=[GET],produces=[application/hal+json || application/json]}" onto public org.springframework.data.rest.webmvc.RepositorySearchesResource org.springframework.data.rest.webmvc.RepositorySearchController.listSearches(org.springframework.data.rest.webmvc.RootResourceInformation)
2018-08-15 15:44:04.533  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/search/{search}],methods=[GET],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<?> org.springframework.data.rest.webmvc.RepositorySearchController.executeSearch(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.util.MultiValueMap<java.lang.String, java.lang.Object>,java.lang.String,org.springframework.data.rest.webmvc.support.DefaultedPageable,org.springframework.data.domain.Sort,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler,org.springframework.http.HttpHeaders)
2018-08-15 15:44:04.533  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/search/{search}],methods=[OPTIONS],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<java.lang.Object> org.springframework.data.rest.webmvc.RepositorySearchController.optionsForSearch(org.springframework.data.rest.webmvc.RootResourceInformation,java.lang.String)
2018-08-15 15:44:04.533  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/search/{search}],methods=[HEAD],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<java.lang.Object> org.springframework.data.rest.webmvc.RepositorySearchController.headForSearch(org.springframework.data.rest.webmvc.RootResourceInformation,java.lang.String)
2018-08-15 15:44:04.535  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}],methods=[OPTIONS],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<?> org.springframework.data.rest.webmvc.RepositoryEntityController.optionsForCollectionResource(org.springframework.data.rest.webmvc.RootResourceInformation)
2018-08-15 15:44:04.535  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}],methods=[HEAD],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<?> org.springframework.data.rest.webmvc.RepositoryEntityController.headCollectionResource(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.data.rest.webmvc.support.DefaultedPageable) throws org.springframework.web.HttpRequestMethodNotSupportedException
2018-08-15 15:44:04.535  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}],methods=[GET],produces=[application/hal+json || application/json]}" onto public org.springframework.hateoas.Resources<?> org.springframework.data.rest.webmvc.RepositoryEntityController.getCollectionResource(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.data.rest.webmvc.support.DefaultedPageable,org.springframework.data.domain.Sort,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler) throws org.springframework.data.rest.webmvc.ResourceNotFoundException,org.springframework.web.HttpRequestMethodNotSupportedException
2018-08-15 15:44:04.536  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}],methods=[GET],produces=[application/x-spring-data-compact+json || text/uri-list]}" onto public org.springframework.hateoas.Resources<?> org.springframework.data.rest.webmvc.RepositoryEntityController.getCollectionResourceCompact(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.data.rest.webmvc.support.DefaultedPageable,org.springframework.data.domain.Sort,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler) throws org.springframework.data.rest.webmvc.ResourceNotFoundException,org.springframework.web.HttpRequestMethodNotSupportedException
2018-08-15 15:44:04.536  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}],methods=[POST],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryEntityController.postCollectionResource(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.data.rest.webmvc.PersistentEntityResource,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler,java.lang.String) throws org.springframework.web.HttpRequestMethodNotSupportedException
2018-08-15 15:44:04.536  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}],methods=[OPTIONS],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<?> org.springframework.data.rest.webmvc.RepositoryEntityController.optionsForItemResource(org.springframework.data.rest.webmvc.RootResourceInformation)
2018-08-15 15:44:04.536  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}],methods=[HEAD],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<?> org.springframework.data.rest.webmvc.RepositoryEntityController.headForItemResource(org.springframework.data.rest.webmvc.RootResourceInformation,java.io.Serializable,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler) throws org.springframework.web.HttpRequestMethodNotSupportedException
2018-08-15 15:44:04.537  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}],methods=[PATCH],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryEntityController.patchItemResource(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.data.rest.webmvc.PersistentEntityResource,java.io.Serializable,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler,org.springframework.data.rest.webmvc.support.ETag,java.lang.String) throws org.springframework.web.HttpRequestMethodNotSupportedException,org.springframework.data.rest.webmvc.ResourceNotFoundException
2018-08-15 15:44:04.537  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}],methods=[DELETE],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<?> org.springframework.data.rest.webmvc.RepositoryEntityController.deleteItemResource(org.springframework.data.rest.webmvc.RootResourceInformation,java.io.Serializable,org.springframework.data.rest.webmvc.support.ETag) throws org.springframework.data.rest.webmvc.ResourceNotFoundException,org.springframework.web.HttpRequestMethodNotSupportedException
2018-08-15 15:44:04.537  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}],methods=[PUT],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<? extends org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.RepositoryEntityController.putItemResource(org.springframework.data.rest.webmvc.RootResourceInformation,org.springframework.data.rest.webmvc.PersistentEntityResource,java.io.Serializable,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler,org.springframework.data.rest.webmvc.support.ETag,java.lang.String) throws org.springframework.web.HttpRequestMethodNotSupportedException
2018-08-15 15:44:04.537  INFO 3920 --- [  restartedMain] o.s.d.r.w.RepositoryRestHandlerMapping   : Mapped "{[/{repository}/{id}],methods=[GET],produces=[application/hal+json || application/json]}" onto public org.springframework.http.ResponseEntity<org.springframework.hateoas.Resource<?>> org.springframework.data.rest.webmvc.RepositoryEntityController.getItemResource(org.springframework.data.rest.webmvc.RootResourceInformation,java.io.Serializable,org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler,org.springframework.http.HttpHeaders) throws org.springframework.web.HttpRequestMethodNotSupportedException
2018-08-15 15:44:04.543  INFO 3920 --- [  restartedMain] o.s.d.r.w.BasePathAwareHandlerMapping    : Mapped "{[/profile/{repository}],methods=[GET],produces=[application/alps+json || */*]}" onto org.springframework.http.HttpEntity<org.springframework.data.rest.webmvc.RootResourceInformation> org.springframework.data.rest.webmvc.alps.AlpsController.descriptor(org.springframework.data.rest.webmvc.RootResourceInformation)
2018-08-15 15:44:04.544  INFO 3920 --- [  restartedMain] o.s.d.r.w.BasePathAwareHandlerMapping    : Mapped "{[/profile/{repository}],methods=[OPTIONS],produces=[application/alps+json]}" onto org.springframework.http.HttpEntity<?> org.springframework.data.rest.webmvc.alps.AlpsController.alpsOptions()
2018-08-15 15:44:04.544  INFO 3920 --- [  restartedMain] o.s.d.r.w.BasePathAwareHandlerMapping    : Mapped "{[/profile],methods=[GET]}" onto org.springframework.http.HttpEntity<org.springframework.hateoas.ResourceSupport> org.springframework.data.rest.webmvc.ProfileController.listAllFormsOfMetadata()
2018-08-15 15:44:04.544  INFO 3920 --- [  restartedMain] o.s.d.r.w.BasePathAwareHandlerMapping    : Mapped "{[/profile],methods=[OPTIONS]}" onto public org.springframework.http.HttpEntity<?> org.springframework.data.rest.webmvc.ProfileController.profileOptions()
2018-08-15 15:44:04.545  INFO 3920 --- [  restartedMain] o.s.d.r.w.BasePathAwareHandlerMapping    : Mapped "{[/profile/{repository}],methods=[GET],produces=[application/schema+json]}" onto public org.springframework.http.HttpEntity<org.springframework.data.rest.webmvc.json.JsonSchema> org.springframework.data.rest.webmvc.RepositorySchemaController.schema(org.springframework.data.rest.webmvc.RootResourceInformation)
2018-08-15 15:44:04.678  INFO 3920 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729
2018-08-15 15:44:04.695  INFO 3920 --- [  restartedMain] o.s.b.a.e.web.EndpointLinksResolver      : Exposing 2 endpoint(s) beneath base path '/actuator'
2018-08-15 15:44:04.705  INFO 3920 --- [  restartedMain] s.b.a.e.w.s.WebMvcEndpointHandlerMapping : Mapped "{[/actuator/health],methods=[GET],produces=[application/vnd.spring-boot.actuator.v2+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.web.servlet.AbstractWebMvcEndpointHandlerMapping$OperationHandler.handle(javax.servlet.http.HttpServletRequest,java.util.Map<java.lang.String, java.lang.String>)
2018-08-15 15:44:04.706  INFO 3920 --- [  restartedMain] s.b.a.e.w.s.WebMvcEndpointHandlerMapping : Mapped "{[/actuator/info],methods=[GET],produces=[application/vnd.spring-boot.actuator.v2+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.web.servlet.AbstractWebMvcEndpointHandlerMapping$OperationHandler.handle(javax.servlet.http.HttpServletRequest,java.util.Map<java.lang.String, java.lang.String>)
2018-08-15 15:44:04.707  INFO 3920 --- [  restartedMain] s.b.a.e.w.s.WebMvcEndpointHandlerMapping : Mapped "{[/actuator],methods=[GET],produces=[application/vnd.spring-boot.actuator.v2+json || application/json]}" onto protected java.util.Map<java.lang.String, java.util.Map<java.lang.String, org.springframework.boot.actuate.endpoint.web.Link>> org.springframework.boot.actuate.endpoint.web.servlet.WebMvcEndpointHandlerMapping.links(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-08-15 15:44:04.831  INFO 3920 --- [  restartedMain] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2018-08-15 15:44:04.833  INFO 3920 --- [  restartedMain] o.s.j.e.a.AnnotationMBeanExporter        : Bean with name 'dataSource' has been autodetected for JMX exposure
2018-08-15 15:44:04.846  INFO 3920 --- [  restartedMain] o.s.j.e.a.AnnotationMBeanExporter        : Located MBean 'dataSource': registering with JMX server as MBean [com.zaxxer.hikari:name=dataSource,type=HikariDataSource]
2018-08-15 15:44:04.903  INFO 3920 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2018-08-15 15:44:04.907  INFO 3920 --- [  restartedMain] .H.H.HospitalManagementSystemApplication : Started HospitalManagementSystemApplication in 8.729 seconds (JVM running for 10.204)
2018-08-15 15:45:23.324  INFO 3920 --- [nio-8080-exec-2] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring FrameworkServlet 'dispatcherServlet'
2018-08-15 15:45:23.325  INFO 3920 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization started
2018-08-15 15:45:23.373  INFO 3920 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 48 ms
2018-08-15 15:45:29.741  INFO 3920 --- [nio-8080-exec-3] o.h.h.i.QueryTranslatorFactoryInitiator  : HHH000397: Using ASTQueryTranslatorFactory
<----------------- Payment List ------------------>  3
com.example.HospitalManagementSystem.HospitalManagementSystem.Model.Payment@77456ddc
com.example.HospitalManagementSystem.HospitalManagementSystem.Model.Payment@4c699830
com.example.HospitalManagementSystem.HospitalManagementSystem.Model.Payment@109e37ec
<----------------- Bill List ------------------>  3
com.example.HospitalManagementSystem.HospitalManagementSystem.Model.Bill@78d63081
com.example.HospitalManagementSystem.HospitalManagementSystem.Model.Bill@759f9952
com.example.HospitalManagementSystem.HospitalManagementSystem.Model.Bill@64e39014

您在实体类账单和付款中都没有获取者和二传手。

JSON 序列化程序查找这些内容。

如果您添加吸气剂/设置器，则一切按预期工作。

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