爲什麼這個類不可序列化？

Question

我有錯誤：

com.google.gwt.user.client.rpc.SerializationException: Type 'ru.xxx.empeditor.client.Dept$$EnhancerByCGLIB$$2f6af516' was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized.: instance = ru.xxx.empeditor.client.Dept@e53d4e 

爲什麼這個類不能序列？

package ru.xxx.empeditor.client; 

import java.util.HashSet; 
import java.util.Set; 

import com.google.gwt.user.client.rpc.IsSerializable; 

/** 
* Dept generated by hbm2java 
*/ 
public class Dept implements IsSerializable { 

    private byte deptno; 
    private String dname; 
    private String loc; 
    private Set<Emp> emps = new HashSet<Emp>(0); 

    public Dept() { 
    } 

    public Dept(byte deptno) { 
     this.deptno = deptno; 
    } 

    public Dept(byte deptno, String dname, String loc, Set<Emp> emps) { 
     this.deptno = deptno; 
     this.dname = dname; 
     this.loc = loc; 
     this.emps = emps; 
    } 

    public byte getDeptno() { 
     return this.deptno; 
    } 

    public void setDeptno(byte deptno) { 
     this.deptno = deptno; 
    } 

    public String getDname() { 
     return this.dname; 
    } 

    public void setDname(String dname) { 
     this.dname = dname; 
    } 

    public String getLoc() { 
     return this.loc; 
    } 

    public void setLoc(String loc) { 
     this.loc = loc; 
    } 

    public Set<Emp> getEmps() { 
     return this.emps; 
    } 

    public void setEmps(Set<Emp> emps) { 
     this.emps = emps; 
    } 

} 

Answer 1

檢查類Emp是否可串行化。

另一個潛在的問題（因爲您使用Hibernate - 注意到自動生成的註釋）可能是因爲修改您的bean的字節代碼的代理，因爲GWT無法序列化它。如此處所述 - http://code.google.com/webtoolkit/articles/using_gwt_with_hibernate.html