Gradle

plugins {
    id 'java'
    id 'org.springframework.boot' version '3.1.3'
    id 'io.spring.dependency-management' version '1.1.3'
}

group = 'com.example'
version = '0.0.1-SNAPSHOT'

java {
    sourceCompatibility = '17'
}

configurations {
    compileOnly {
        extendsFrom annotationProcessor
    }
}

repositories {
    mavenCentral()
}

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
    compileOnly 'org.projectlombok:lombok'
    runtimeOnly 'org.mariadb.jdbc:mariadb-java-client'
    annotationProcessor 'org.projectlombok:lombok'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
    testCompileOnly 'org.projectlombok:lombok'
    testAnnotationProcessor 'org.projectlombok:lombok'
}

tasks.named('test') {
    useJUnitPlatform()
}

实体

@Entity
@Getter
@Setter
public class Child {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "member_id")
    private Long id;
    private String name;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "parent_id")
    private Parent parent;
}

@Entity
@Getter
@Setter
public class Parent {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "member_id")
    private Long id;
    private String name;
    @OneToMany(mappedBy = "parent", orphanRemoval = true)
    private List<Child> childList = new ArrayList<>();

    public void addChild(Child child){
        childList.add(child);
        child.setParent(this);
    }
}

测试代码

@Test
@Transactional
@Rollback(value = false)
void name() {
    Child child1 = new Child();
    child1.setName("child1");

    Parent parent = new Parent();
    parent.addChild(child1);

    em.persist(parent);
    em.persist(child1);

    em.flush();
    em.clear();

    Parent findParent = em.find(Parent.class, parent.getId());

    findParent.getChildList().remove(0);
    //em.remove(findParent);
}

日志

Hibernate: 
    /* insert for
        com.example.jpa.domain.Parent */insert 
    into
        parent (name) 
    values
        (?)
Hibernate: 
    /* insert for
        com.example.jpa.domain.Child */insert 
    into
        child (name,parent_id) 
    values
        (?,?)
Hibernate: 
    select
        p1_0.member_id,
        p1_0.name 
    from
        parent p1_0 
    where
        p1_0.member_id=?
Hibernate: 
    select
        c1_0.parent_id,
        c1_0.member_id,
        c1_0.name 
    from
        child c1_0 
    where
        c1_0.parent_id=?

我现在是一名学习JPA的学生。在研究孤立对象删除设置时，我注意到当我不设置CASCADE时，删除父对象本身会删除实际数据库中的子对象。然而，当我从父列表中删除子列表时，JPA似乎没有检测到这种变化。
从我所学到的，当父对象和子对象之间的关联被破坏时，子对象应该被删除。那么，当我从父列表中删除子列表时，为什么子列表中的数据没有被删除？是因为没有CASCADE设置，对父对象的操作不能到达子对象吗？或者这是一个bug？我需要一个解释。