JMS / ActiveMQ：发送带有对象作为类成员的对象 [英] JMS / ActiveMQ: Sending an object with objects as class members

问题描述

我正在使用ActiveMQ（带有Spring）将消息发送到远程OSGi-Container。
这很好用，但是有一个问题。

I'm using ActiveMQ (with Spring) for sending messages to remote OSGi-Container. This works very fine, but there is one issue.

我有两个实现Serializable的类。一个类是另一个类的类成员，例如：

I got two classes implementing Serializable. One class is the class member of the other class, like this:

public class Member implements Serializble {
private int someValue;
private static final long serialVersionUID = -4329617004242031635L;
... }

public class Parent implements Serializable {
    private static final long serialVersionUID = -667242031635L;
private double otherValue;
private Member;
}

因此，当发送Parent实例时，Parent的成员为null 。

So, when is send a Parent instance, the Member of the Parent is null.

希望您了解我的问题是什么：）

Hope you understand what my problem is :)

编辑：有趣的问题：我有一个Java。我类中的util.date已正确序列化，但这是唯一的事情，所有Doubles均为空

funny issue: I got a java.util.date in my class which is serialized correctly, but this is the only thing, all Doubles etc are null

推荐答案

序列化对象字节消息中的消息有点难处理。

Serialized objects in byte messages are a bit hard to deal with.

我会使用对象消息，如阿克塞尔·威尔格特（Aksel Willgert）所建议的那样，或者只是将其带入更松散的耦合格式，例如作为序列化的XML。我的快速解决方案是使用XStream以更宽松的耦合方式访问XML，或从XML接收XML，这是此处的快速指南： XStream

I would go with object messages, as Aksel Willgert suggested, or simply take it to some more loosley coupled format, such as serialzied XML. I quick solution would be to use XStream to go to/from XML in a more loosely coupled fashion, a quick guide here: XStream

更新，以及此处的一些代码（需要将xstream-.jar添加到您的项目中）

Update, and some code here (need to add xstream-.jar to your project)

// for all, instanciate XStream
XStream xstream = new XStream(new StaxDriver());

// Producer side:
TextMessage message = session.createTextMessage(xstream.toXML(mp));
producer.send(message);


// consumer side:
TextMessage tmsg = (TextMessage)msg;
Parent par = (Parent)xstream.fromXML(tmsg.getText());

par.getMember() // etc should work just fine.

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