java - 如何在可嵌入对象上触发 EntityListener

Question

我有一个带有 EmebeddedId 的实体。实体上的实体监听器(加载时去除 Strings 上的空白)按预期被触发，id Embeddable 上的同一监听器根本没有被触发。

我做错了吗？如何修复？

实体:

@Entity
@Table(name = "SUBMITTER_VIEW")
@EntityListeners(TrimListener.class)
public class Submitter implements Serializable {

    private static final long serialVersionUID = 1L;

    @EmbeddedId
    private SubmitterPK id;

    @Trim
    @Column(name = "DOC_NAME")
    private String name;
...

可嵌入:

@Embeddable
@EntityListeners(TrimListener.class)
public class SubmitterPK implements Serializable {

    private static final long serialVersionUID = 1L;

    @Column(name = "LSTORT")
    private String bsnr;

    @Trim
    @Column(name = "LOGIN")
    private String login;
...

听众:

public class TrimListener {

    Logger log = LoggerFactory.getLogger("TrimListener");

    @PostLoad
    public void repairAfterLoad(final Object entity) throws IllegalAccessException {

        log.debug("trimlistener active");

        final Set<Field> trimProps = getTrimProperties(entity.getClass());

        for (final Field fieldToTrim : trimProps) {
            final String propertyValue = (String) fieldToTrim.get(entity);
            if (propertyValue != null) {
                fieldToTrim.set(entity, propertyValue.trim());
            }
        }
    }
...

Answer 1

我认为它显然被忽略了，因为它不是 JPA 2.0 期望它的标准位置。根据 JPA 2.0 最终规范，实体监听器可以是实体、映射的父类(super class)或与其中之一关联的监听器(请参阅规范的第 3.5 节):

A method may be designated as a lifecycle callback method to receive notification of entity lifecycle events. A lifecycle callback method can be defined on an entity class, a mapped superclass, or an entity listener class associated with an entity or mapped superclass