Java :: Prevent Circular References With Dependency Injection And Garbage Collection?

May 26, 2011

I think I'm still trying to understand Dependency Injection and the role of the DI container. If DI means a lower level component depends on a higher level one, and there's no circular reference, won't that object get garbage collected? As I see garbage collection (mark-and-sweep), it keeps only the objects that can be traced with a chain of references starting from the program root.

Since I'm having difficulty explaining myself, here are two UML diagrams, which present conflicting views of Dependency Injection, as I see it: My original interpretation of DI

The DI Container injects components with their required references, and they each store a reference to their next-highest-in-command. The Main class has no way of reaching them, so they should be garbage collected. My reconsideration of DI The DI Container injects components with their required references and also maintains a reference to each of them. They each store a reference to their next-highest-in-command. The Main class can reach any of them via the DI Container, so they shouldn't be garbage collected.

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