HashBiMap SerializationException或如何在不适用IsSerializable的情况下序列化类? [英] HashBiMap SerializationException or how to serialize classes where IsSerializable is not applicable?

查看：75
本文介绍了HashBiMap SerializationException或如何在不适用IsSerializable的情况下序列化类?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

问题似乎是并非所有的Guava类都可以直接序列化.

Problem seems to be that not all Guava classes are serializable out-of-the-box.

我找到了一个很好的解决方案，喜欢分享. (在本例中为HashBiMap). (也许有些番石榴开发人员可能最好将这一天应用于所有课程)

I found a quite good solution to this and like to share it. (in this case for HashBiMap). (Maybe some Guava developers may apply this one day to ideally all of the classes)

如果您复制下面的类(并可能将其调整为您可以序列化的类)，您将在Javadoc注释中包含更多的调查详细信息.

If you copy the below class (and maybe adjust it to your to-be-serializable class) you will have further investigation details inside the Javadoc comment already.

package com.google.common.collect;

import java.util.LinkedHashMap;
import java.util.Map;

import com.google.gwt.user.client.rpc.SerializationException;
import com.google.gwt.user.client.rpc.SerializationStreamReader;
import com.google.gwt.user.client.rpc.SerializationStreamWriter;
import com.google.gwt.user.client.rpc.core.java.util.Map_CustomFieldSerializerBase;

/**
 * idea taken from some <a href=
 * "http://code.google.com/r/baggiogamp-guava/source/browse/gwt-src/com/google/common/collect/RegularImmutableBiMap_CustomFieldSerializer.java?r=a7aa10ddb815ce7996f3fae103bfd3823b1336ed&spec=svn6923b5fac0feb7005429d0b24be93b91685f9637"
 * >com/google/common/collect/RegularImmutableBiMap_CustomFieldSerializer.java</
 * a> <br/>
 * Problem was, that {@link HashBiMap} seems not to be serializable for GWT:
 * <ul>
 * <li>it nor its super classes do not implement com.google.gwt.user.client.rpc.IsSerializable (why?)</li>
 * <li>the following solution does not work if only applied to some super class, e.g. AbstractBiMap</li>
 * </ul>
 * <pre>
 * com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException: The response could not be deserialized
    at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:221)
    at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
    at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
    at sun.reflect.GeneratedMethodAccessor119.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:338)
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:219)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:571)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:279)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
    at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:242)
    at sun.reflect.GeneratedMethodAccessor116.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:293)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:547)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
    at java.lang.Thread.run(Unknown Source)
Caused by: com.google.gwt.user.client.rpc.SerializationException: com.google.common.collect.HashBiMap/1352983899
    at com.google.gwt.user.client.rpc.impl.SerializerBase.getTypeHandler(SerializerBase.java:153)
    at com.google.gwt.user.client.rpc.impl.SerializerBase.instantiate(SerializerBase.java:114)
    at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:396)
    at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
    at mycomp.shared.conf.Config_FieldSerializer.deserialize(Config_FieldSerializer.java:12)
    at mycomp.shared.conf.Config_FieldSerializer.deserial(Config_FieldSerializer.java:35)
    at com.google.gwt.user.client.rpc.impl.SerializerBase.deserialize(SerializerBase.java:95)
    at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:398)
    at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
    at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter$ResponseReader$8.read(RequestCallbackAdapter.java:106)
    at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:214)
    at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
    at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
    at sun.reflect.GeneratedMethodAccessor119.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:338)
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:219)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:571)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:279)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
    at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:242)
    at sun.reflect.GeneratedMethodAccessor116.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:293)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:547)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
    at java.lang.Thread.run(Unknown Source)
 * </pre>
 * 
 * @author ADietrich
 * 
 */
public class HashBiMap_CustomFieldSerializer {

    public static void deserialize(SerializationStreamReader reader,
        HashBiMap<?, ?> instance) {
    }

    public static HashBiMap<Object, Object> instantiate(
            SerializationStreamReader reader) throws SerializationException {
        Map<Object, Object> entries = new LinkedHashMap<Object, Object>();
        Map_CustomFieldSerializerBase.deserialize(reader, entries);
        return HashBiMap.create(entries);
    }

    public static void serialize(SerializationStreamWriter writer,
        HashBiMap<?, ?> instance) throws SerializationException {
        Map_CustomFieldSerializerBase.serialize(writer, instance);
        }
}

推荐答案

仅对于针对GWT序列化的功能请求阅读更多详细信息并提出要求.但是，我首先考虑在RPC接口中使用ImmutableBiMap而不是HashBiMap.与大多数不可变类型一样，ImmutableBiMap已经可以GWT序列化.

Implementing Serializable is sufficient only for specially designed classes. Guava's classes aren't designed that way (for various reasons). As a result, we need to add special support for each individual class. We've done this for some classes, and we can do it for others, though there are tradeoffs. We have a feature request for GWT serialization where you can read more detail and make requests. However, I'd first consider using ImmutableBiMap, rather than HashBiMap, in your RPC interface. ImmutableBiMap, like most of the immutable types, is already GWT serializable.

这篇关于HashBiMap SerializationException或如何在不适用IsSerializable的情况下序列化类?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

查看全文
相关文章
其他开发最新文章
热门教程
热门工具
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆