hibernate+mysql关联映射师遇到java.lang.StackOverflowError异常

@Entity
@Table(name = "app",schema = "", catalog = "game")
public class AppEntity {
    @Id
    @Column(name = "appId")
    private String appId;

    @Basic
    @Column(name = "appName")
    private String  appName;
    @Basic
    @Column(name = "appdesc")
    private String appdesc;
    @Basic
    @Column(name = "provider")
    private String provider;
    @Basic
    @Column(name = "version")
    private String version;
    @Basic
    @Column(name="postTime")
    private Long postTime;
    @Basic
    @Column(name = "updateTime")
    private Long updateTime;

    @OneToMany(mappedBy = "appEntity",fetch = FetchType.EAGER)
    private Set<ProductEntity> productEntities;
    @OneToMany(mappedBy = "appEntity",fetch = FetchType.LAZY)
    private Set<OrdersEntity> ordersEntities;

多的一方
@Entity
@Table(name = "product", schema = "" , catalog = "game")
@IdClass(ProductEntityPK.class)
public class ProductEntity {
    @Id
    @Column(name = "appId")
    private String appId;
    @Id
    @GeneratedValue
    @Column(name = "productId")
    private long productId;
    @Basic
    @Column(name = "productName")
    private String productName;
    @Basic
    @Column(name = "productDesc")
    private String productDesc;
    @Basic
    @Column(name = "price")
    private long price;
  
    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name="appId",insertable = false, updatable = false)
    private AppEntity appEntity;

@Override

public String toString() {
    return "ProductEntity{" +
            "appId=‘" + appId + ‘\‘‘ +
            ", productId=" + productId +
            ", productName=‘" + productName + ‘\‘‘ +
            ", productDesc=‘" + productDesc + ‘\‘‘ +
            ", price=" + price 
            ", appEntity=" + appEntity +
            ‘}‘;
}

解决办法：将productEntity的toString方法中去掉 ", appEntity=" + appEntity +

hibernate+mysql关联映射师遇到java.lang.StackOverflowError异常

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