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Dependency Injection

A good starting point for understanding DI is

  • Spring

  • Quarkus

In spring the reference documentation explains the dependency injection (DI) aka Inversion of Control (IoC) mechanisms in deep details:

For quarkus the following article explains the details of dependency injection:

Use annotations over xml for controlling DI

Some frameworks like spring might still allow Bean definitions via XML. This should be avoided and instead the annotations should be used.

Use constructor injection

Constructor injection makes the code better testable, because dependencies can be mocked without using reflection techniques.

Spring specific rules

Omit @Autowired annotation on constructor injection

Starting with spring 4.3 @Autowired is not necessary anymore on constructor injection. If the used version is higher or equal 4.3, then the annotation should be omitted.