GWT和Enum的问题

Question

我在GWT应用程序的客户端部分有一个枚举,当我尝试运行与序列化问题相关的异常时,我得到一个异常.我做错了吗？我读到GWT支持枚举,我使用的是最后一个版本.

枚举:

public enum AnEnum implements Serializable {

    ITEM_A("Item a description"), ITEM_B("Item b description");

    private String description;

    private AnEnum(String description) {
        this.description = description;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

}

例外:

Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:742)
    ... 47 more
Caused by: com.google.gwt.user.client.rpc.SerializationException: Type '(...).client.(...).AnEnum' 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 = ITEM_A
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:610)
    at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:129)
    at com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.serialize(Collection_CustomFieldSerializerBase.java:43)
    at com.google.gwt.user.client.rpc.core.java.util.LinkedList_CustomFieldSerializer.serialize(LinkedList_CustomFieldSerializer.java:36)
    ... 52 more

Answer 1

添加IsSerializable接口,默认的作用域无参数构造函数,并确保它位于gwt.xml文件中源标记中列出的其中一个路径中. <source path="client">

我真的认为第三个建议是问题; 我记得之前有这个问题,因为我在源路径之外有一个dto.

您可以拥有多个源标记.

<source path="common" />
<source path="client" />

一种模式是将持久化对象直接放在com.mysite.common下,并在com.mysite.common.dto中通过线路传输持久化项目的mashup,当然客户端gui代码也在客户端.

package com.mysite.client;

import java.io.Serializable;

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

public enum AnEnum implements Serializable, IsSerializable {

    ITEM_A("Item a description"), ITEM_B("Item b description");

    private String description;

    AnEnum() {
    }

    AnEnum(String description) {
        this.description = description;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

}