将RestController与PagedModel

问题描述

根据this教程，我尝试添加其他服务。

它具有此方法：

    @GetMapping(path = "/albums")
    public PagedModel<Album> getAlbums(Pageable pageable) {
        final var albums = albumRepository.findAll(pageable);
        return PagedModel.of(albums.getContent(),new PagedModel.PageMetadata(albums.getSize(),pageable.getPageNumber(),albums.getTotalElements(),albums.getTotalPages()));
    }

演员：

package example;

import java.io.Serializable;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.Table;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
@ToString(exclude = "albums")
@Entity
@Table(name="actor")
public class Actor implements Serializable
{
    private static final long serialVersionUID = 1L;
     
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String firstName;
    private String lastName;
    private String birthDate;
     
    @ManyToMany(cascade= CascadeType.ALL)
    @JoinTable(
      name = "actor_album",joinColumns = @JoinColumn(name = "actor_id"),inverseJoinColumns = @JoinColumn(name = "album_id"))
    private List<Album> albums;
}

相册：

package example;

import java.io.Serializable;
import java.util.List;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
import javax.persistence.Table;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
@Entity
@ToString(exclude = "actors")
@Table(name="album")
public class Album implements Serializable
{
    private static final long serialVersionUID = 1L;
     
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String title;
    private String description;
    private String releaseDate;
     
    @ManyToMany(mappedBy = "albums",fetch = FetchType.EAGER)
    private List<Actor> actors;
}

如果我调用我的方法，则会引发StackOverflowError：

java.lang.StackOverflowError: null
    at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[na:na]
    at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016) ~[na:na]
    at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174) ~[na:na]
    at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:800) ~[na:na]
    at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:698) ~[na:na]
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:621) ~[na:na]
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:579) ~[na:na]
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[na:na]
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[na:na]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:773) ~[jackson-databind-2.11.2.jar:2.11.2]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:178) ~[jackson-databind-2.11.2.jar:2.11.2]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:145) ~[jackson-databind-2.11.2.jar:2.11.2]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:107) ~[jackson-databind-2.11.2.jar:2.11.2]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:25) ~[jackson-databind-2.11.2.jar:2.11.2]

问题似乎是，仅正确显示了根专辑，而对于链接的Actor而不是摘录，整个实体都被呈现了-包括对专辑的引用。

如果我使用自定义的汇编程序并生成显式DTO作为返回对象，则我会松散各种生成默认链接。

有没有想法，当我没有自定义的RestController时，如何获得自动魔术序列化功能？

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

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