Jpa @OnetoOne与Java8的关系

Question

我不能在JPA实体中使用 java.util.Optional （jdk8 +）。

@OneToOne(optional = false, mappedBy = "authorId")
private Optional<Author> author;

我得到：

Caused by: org.hibernate.AnnotationException: Unknown mappedBy in:
com.mypackage.Album.author, referenced property unknown: java.util.Optional.authorId

Answer 1

如果要使用可选选项，请实施getter方法：

@OneToOne(optional = false, mappedBy = "authorId")
private Author author;

public getAuthor(){
    return Optional.ofNullable(author);
}

查看this以获得详细信息。