Java 获取所有项的映射方法返回空列表

我正在学习春季开机通过

通过GET方法

/room

我应该能够获得嵌入式数据库中所有当前房间的列表。

schema.sql

和

data.sql

文件都已就位

我的实体类

Room.java

：

package com.frankmoley.landon.data.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "ROOM")
public class Room {
    @Id
    @Column(name = "ROOM_ID")
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;
    @Column(name = "NAME")
    private String name;
    @Column(name = "ROOM_NUMBER")
    private String number;
    @Column(name = "BED_INFO")
    private String bedInfo;

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getNumber() {
        return number;
    }

    public void setNumber(String number) {
        this.number = number;
    }

    public String getBedInfo() {
        return bedInfo;
    }

    public void setBedInfo(String bedInfo) {
        this.bedInfo = bedInfo;
    }

}

package com.frankmoley.landon.data.repository;

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import com.frankmoley.landon.data.entity.Room;

@Repository
public interface RoomRepository extends CrudRepository<Room, Long> {

    Room findByNumber(String number);
}

spring.jpa.hibernate.dll-auto=none
management.endpoints.web.exposure.include=*

存储库类

RoomRepository.java

：

package com.frankmoley.landon.data.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "ROOM")
public class Room {
    @Id
    @Column(name = "ROOM_ID")
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;
    @Column(name = "NAME")
    private String name;
    @Column(name = "ROOM_NUMBER")
    private String number;
    @Column(name = "BED_INFO")
    private String bedInfo;

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getNumber() {
        return number;
    }

    public void setNumber(String number) {
        this.number = number;
    }

    public String getBedInfo() {
        return bedInfo;
    }

    public void setBedInfo(String bedInfo) {
        this.bedInfo = bedInfo;
    }

}

package com.frankmoley.landon.data.repository;

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import com.frankmoley.landon.data.entity.Room;

@Repository
public interface RoomRepository extends CrudRepository<Room, Long> {

    Room findByNumber(String number);
}

spring.jpa.hibernate.dll-auto=none
management.endpoints.web.exposure.include=*

当我运行应用程序时，我在Eclipse中看到关于此映射的消息：

将“{[/rooms]，方法=[GET]}”映射到 java.util.List com.frankmoley.landon.data.webservice.RoomController.findAll（java.lang.String）

但是当我导航到

localhost:8080/rooms

时，我得到的只是一个空的JSON对象

应用程序。属性：

package com.frankmoley.landon.data.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "ROOM")
public class Room {
    @Id
    @Column(name = "ROOM_ID")
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;
    @Column(name = "NAME")
    private String name;
    @Column(name = "ROOM_NUMBER")
    private String number;
    @Column(name = "BED_INFO")
    private String bedInfo;

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getNumber() {
        return number;
    }

    public void setNumber(String number) {
        this.number = number;
    }

    public String getBedInfo() {
        return bedInfo;
    }

    public void setBedInfo(String bedInfo) {
        this.bedInfo = bedInfo;
    }

}

package com.frankmoley.landon.data.repository;

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import com.frankmoley.landon.data.entity.Room;

@Repository
public interface RoomRepository extends CrudRepository<Room, Long> {

    Room findByNumber(String number);
}

spring.jpa.hibernate.dll-auto=none
management.endpoints.web.exposure.include=*

---

尝试设置ddl自动更新，然后创建或创建拖放

spring.jpa.hibernate.ddl-auto=update

---

更新更改似乎解决了问题。谢谢。如果可能的话，请修改你的答案，使之切中要害。完成。这是我第一次正确回答stackoverflow）恭喜！继续前进。