Unable to evaluate the expression Method threw 'org.hibernate.LazyInitializationException' exception

错误

实体类当前字段关系为 OneToMany。

    @OneToMany(mappedBy = "userId")
    private Set signInIds = new HashSet<>();

解决方案

加入 fetch = FetchType.EAGER ，然后在运行不会报错了。

    @OneToMany(mappedBy = "userId",fetch = FetchType.EAGER)
    private Set signInIds = new HashSet<>();

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