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

原因在进行关联映射时在多的一方的toString方法中有对属性对应的一的一方的输出

比如：

一的一方：

@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 +