```
@Qualifier
@Documented
@Target({METHOD,FIELD,PARAMETER})
@Retention(RUNTIME)
public @interface Optional
```
This annotation can be applied to methods, fields, and parameters to mark them as optional for the dependency injection. Typically, if the injector is unable to find a value to inject, then injection will fail. However if a value cannot be found and if this annotation is specified, then:
- for parameters: a null value will be injected;
- for methods: the method calls will be skipped;
- for fields: the values will not be injected.
Note that null is as an acceptable value and is not the same as a value not being found. For example, the IEclipseContext-based supplier distinguishes between a value being set to null (i.e., context.set(SOMEKEY, null)) and the value not found (i.e., context.remove(SOMEKEY)).
Example usage:
```
   public class Car {
     @Inject @Optional void setOverdrive(OverdriveMode mode);
     ...
   }
 
```
Since:

1.3

Annotation Type Optional