Question

我有可嵌入注释的类，当尝试将实例传递给实体时，我得到异常

org.hibernate.InstantiationException：没有默认构造函数 entity :: entity.D3

enum Figure {
    SQUARE, TRIANGLE
};

@Embeddable
public class D3 {
    float z;
    @Enumerated(EnumType.STRING)
    Figure figure;

    public D3(float z, Figure f) {
        this.z = z;
        this.figure = f;
    }
}

Answer 1

除了您定义的任何内容之外，它正在寻找默认构造函数（即无参数）：

@Embeddable
public class D3 {
    float z;
    @Enumerated(EnumType.STRING)
    Figure figure;

    public D3() { //I've added this
    }

    public D3(float z, Figure f) {
        this.z = z;
        this.figure = f;
    }
}

embeddable类有构造函数吗？

1 个答案: