Question

What is the best way to inject dependencies into Servlets when you don’t want to use any sort of DI frameworks? Shall I put them into the ServletContext in a ServletContextListener?

Answer 1

Yes. You could initialize them in a ServletContextListener (if you need them pre-initialized) and then put them into the ServletContext for all your servlets to access.

It’s probably best to store the objects by their class name so retrieval is type-safe.

Foo foo = servletContext.getAttribute(Foo.class.getName());