method injection

Spring method injection with Java Configuration

Last week, I described how a Rich Model Object could be used with Spring using Spring’s method injection from an architectural point of view. What is missing, however, is how to use method injection with my new preferred method for configuration, Java Config. My start point is the following, using both autowiring (shudder) and method injection.

Java

Rich Domain Objects and Spring Dependency Injection are compatible

I’m currently working in a an environment where most developers are Object-Oriented fanatics. Given that we develop in Java, I think that it is a good thing - save the fanatics part. In particular, I’ve run across a deeply-entrenched meme that states that modeling Rich Domain Objects and using Spring dependency injection at the same time is not possible.

Java

Method injection with Spring

Spring core comes out-of-the-box with two scopes: singletons and prototypes. Singletons implement the Singleton pattern, meaning there’s only a single instance at runtime (in a JVM). Spring instantiate them during context creation, caches them in the context, and serves them from the cache when needed (or something like that). Prototypes are instantiated each time you access the context to get the bean.