Why does Spring's @Configurable sometimes work and sometimes not?

Question

I\'m trying to use automatic dependency injection via Spring\'s @Configurable annotation w/ @Resource on the fields needing injection. This involved some setup, like passing

Answer 1

When the injection doesn't work, for whatever reason, there is no way for code to do any dependency check, so there is now error thrown.

Otherwise I can't see anything here that would indicate the random failure. Can you extract a simplified example to check?