为什么我收到此错误:java.lang.Exception:XMLEncoder:discarding语句Vector.add()?

时间:2010-06-14 15:03:46

标签: java vector xmlencoder

我的Java程序看起来像这样:

  public class Biz_Manager
  {
    static Contact_Info_Setting Customer_Contact_Info_Panel;
    static XMLEncoder XML_Encoder;
    ......

    void Get_Customer_Agent_Shipping_Company_And_Shipping_Agent_Net_Worth_Info()
    {
      try
      {
        XML_Encoder=new XMLEncoder(new BufferedOutputStream(new FileOutputStream(Customer_Contact_Info_Panel.Contact_Info_File_Path)));
        XML_Encoder.writeObject(Customer_Contact_Info_Panel.Contacts_Vector);
      }
      catch (Exception e) { e.printStackTrace(); }
      finally
      {
        if (XML_Encoder!=null)
        {
          XML_Encoder.close();   // <== Error here , line : 9459
          XML_Encoder=null;
        }
      }
    }
  }

// ============================================= ==========================

public class Contact_Info_Setting extends JPanel implements ActionListener,KeyListener,ItemListener
{
  public static final long serialVersionUID=26362862L;
  ......
  Vector<Contact_Info_Entry> Contacts_Vector=new Vector<Contact_Info_Entry>();
  ......
}

// ============================================= ==========================

package Utility;

import java.io.*;
import java.util.*;
import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;

@PersistenceCapable(identityType=IdentityType.APPLICATION)
public class Contact_Info_Entry implements Serializable
{
  @PrimaryKey
  @Persistent(valueStrategy=IdGeneratorStrategy.IDENTITY)
  public Long Id;
  public static final long serialVersionUID=26362862L;
  public String Contact_Id="",First_Name="",Last_Name="",Company_Name="",Branch_Name="",Address_1="",Address_2="",City="",State="",Zip="",Country="";
  ......
  public boolean B_1;
  public Vector<String> A_Vector=new Vector<String>();

  public Contact_Info_Entry() { }
  public Contact_Info_Entry(String Other_Id) { this.Other_Id=Other_Id; }
  ......
  public void setId(Long value) { Id=value; }
  public Long getId() { return Id; }

  public void setContact_Id(String value) { Contact_Id=value; }
  public String getContact_Id() { return Contact_Id; }

  public void setFirst_Name(String value) { First_Name=value; }
  public String getFirst_Name() { return First_Name; }

  public void setLast_Name(String value) { Last_Name=value; }
  public String getLast_Name() { return Last_Name; }

  public void setCompany_Name(String value) { Company_Name=value; }
  public String getCompany_Name() { return Company_Name; }
  ......
}

我收到此错误消息:

java.lang.Exception:XMLEncoder:discarding语句Vector.add(Contact_Info_Entry); 继续...... java.lang.Exception:XMLEncoder:discarding语句Vector.add(Contact_Info_Entry); 继续...... java.lang.Exception:XMLEncoder:discarding语句Vector.add(Contact_Info_Entry); 继续...... java.lang.Exception:XMLEncoder:discarding语句Vector.add(Contact_Info_Entry); 继续...... 线程“Thread-8”中的异常java.lang.NullPointerException         在java.beans.XMLEncoder.outputStatement(XMLEncoder.java:611)         在java.beans.XMLEncoder.outputValue(XMLEncoder.java:552)         在java.beans.XMLEncoder.outputStatement(XMLEncoder.java:682)         at java.beans.XMLEncoder.outputStatement(XMLEncoder.java:687)         在java.beans.XMLEncoder.outputValue(XMLEncoder.java:552)         在java.beans.XMLEncoder.flush(XMLEncoder.java:398)         在java.beans.XMLEncoder.close(XMLEncoder.java:429)         at Biz_Manager.Get_Customer_Agent_Shipping_Company_And_Shipping_Agent_Net_Worth_Info(Biz_Manager.java:9459)

似乎无法处理矢量,为什么?哪里不对了 ?如何解决?

2 个答案:

答案 0 :(得分:0)

答案 1 :(得分:0)

对我而言,这意味着“你需要一个没有arg的构造函数”(显然是不同的类)