持久化的时候使用JPA ，使用merge处理父子表数据的时候，注释类配置如下

父entity 类的子entity配置如下

/**
	 * 获取附件列表
	 * 
	 * @return the articleAttachments
	 */
	
	@Valid
	@OneToMany(mappedBy = "article", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
	@ElementCollection(targetClass = ArticleAttachment.class, fetch = FetchType.LAZY)
	@CollectionTable(name = "xx_article_attachment", joinColumns = @JoinColumn(name = "article", referencedColumnName = "id"))
	@OrderBy("priority asc")
	public List<ArticleAttachment> getArticleAttachments() {
		return articleAttachments;
	}

使用了@OneToMany and CASCADE.ALL

这个时候执行merge操作的时候，会出现字表数据重复插入2次的问题，在JBoss hibernate官网我找到了bug fix  JBoss的东西都挺重的。

修改成@OneToMany and CASCADE.PERSIST，申明为级联级联保存

	/**
	 * 获取附件列表
	 * 
	 * @return the articleAttachments
	 */
	
	@Valid
	@OneToMany(mappedBy = "article", fetch = FetchType.LAZY, cascade = CascadeType.PERSIST)
	@ElementCollection(targetClass = ArticleAttachment.class, fetch = FetchType.LAZY)
	@CollectionTable(name = "xx_article_attachment", joinColumns = @JoinColumn(name = "article", referencedColumnName = "id"))
	@OrderBy("priority asc")
	public List<ArticleAttachment> getArticleAttachments() {
		return articleAttachments;
	}

【FAQ Fix】 JPA Double insert with @OneToMany and CASCADE.ALL,布布扣,bubuko.com

【FAQ Fix】 JPA Double insert with @OneToMany and CASCADE.ALL