小编Ama*_*sva的帖子

请求sombody帮帮我？我在Client.class中保存数据时收到此错误

Client.class

package com.pojo;

import java.io.Serializable;
import java.util.List;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToMany;

@Entity
public class Client implements Serializable {
private String Name;
private String Address;
private float balance;
@Id
@GeneratedValue
private int client_id;

@OneToMany(targetEntity=Ledger.class,mappedBy="client",cascade= CascadeType.ALL,fetch= FetchType.EAGER)
private List<Ledger> ledger;

public float getBalance() {
    return balance;
}

public void setBalance(float balance) {
    this.balance = balance;
}

public List<Ledger> getLedger() {
    return ledger;
}

public void setLedger(List<Ledger> ledger) {
    this.ledger = ledger;
}

public …