Hibernate+mysql Association Mapper encounters Java.lang.StackOverflowError exception

Hibernate+mysql Association Mapper encounters Java.lang.StackOverflowError exception

Cause the output of one side of a property corresponding to an attribute in the ToString method of a multi-party when making an association map

Like what:

a party to:

@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;

   many of the parties   
 @Entity 
 @Table (name = "Product", schema = "", Catalog = "Game") 
 @IdClass (productentitypk.class) 
 public class ProductEntity {
 @Id 
 @Column (name = "App    Id ") 
 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 + "+
            
            ", appentity=" + appentity +
            ‘}‘;
}

", appentity=" + appentity +

Hibernate+mysql Association Mapper encounters Java.lang.StackOverflowError exception