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POSpring session-scoped beans (controllers) and references to services, in terms of serialization
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  1. POSpring session-scoped beans (controllers) and references to services, in terms of serialization
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    copied!<ul> <li>a standard case - you have a controller (<code>@Controller</code>) with <code>@Scope("session")</code>.</li> <li>classes put in the session usually are expected to implement <code>Serializable</code> so that they can be stored physically in case the server is restarted, for example</li> <li>If the controller implements <code>Serializable</code>, this means all services (other spring beans) it is referring will also be serialized. They are often proxies, with references to transaction mangers, entity manager factories, etc.</li> <li>It is not unlikely that some service, or even controller, hold a reference to the <code>ApplicationContext</code>, by implementing <code>ApplicationContextAware</code>, so this can effectively mean that the whole context is serialized. And given that it holds many connections - i.e. things that are not serializable by idea, it will be restored in corrupt state.</li> </ul> <p>So far I've mostly ignored these issues. Recently I thought of declaring all my spring dependencies <code>transient</code> and getting them back in <code>readResolve()</code> by the static utility classes <code>WebApplicationContextUtils</code> and such that hold the request/ServletContext in a <code>ThreadLocal</code>. This is tedious, but it guarantees that, when the object is deserialized, its dependencies will be "up to date" with the <em>current</em> application context.</p> <p>Is there any accepted practice for this, or any guidelines for serializing parts of the spring context.</p> <p>Note that in JSF, managed beans (~controllers) are stateful (unlike action-based web frameworks). So perhaps my question stands more for JSF, than for spring-mvc.</p>
 

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