```
@Retention(RUNTIME)
@Target(PARAMETER)
public @interface Optional
```
When present on a constructor parameter, indicates that the specified dependency is optional. If the dependency cannot be resolved then a null value will be injected instead.

Use of this annotation is not encouraged, it should be used with caution. Optional dependencies make it harder to reason about the dependency graph. Making a dependency optional does not break dependency cycles, use Provider instead.

Author:

cdivilly

Annotation Type Optional