javax.inject

Interface Provider<T>

Contents
  • All Known Subinterfaces:
    Instance<T>
    All Known Implementing Classes:
    CDI

    public interface Provider<T>
    Provides instances of T. Typically implemented by an injector. For any type T that can be injected, you can also inject Provider<T>. Compared to injecting T directly, injecting Provider<T> enables:
    • retrieving multiple instances.
    • lazy or optional retrieval of an instance.
    • breaking circular dependencies.
    • abstracting scope so you can look up an instance in a smaller scope from an instance in a containing scope.

    For example: 

       class Car {
     @Inject Car(Provider<Seat> seatProvider) {
       Seat driver = seatProvider.get();
       Seat passenger = seatProvider.get();
       ...
     }
   }

    • Method Detail

      • get

        T get()
        Provides a fully-constructed and injected instance of T.
        Throws:
        RuntimeException - if the injector encounters an error while providing an instance. For example, if an injectable member on T throws an exception, the injector may wrap the exception and throw it to the caller of get(). Callers should not try to handle such exceptions as the behavior may vary across injector implementations and even different configurations of the same injector.

Document created the 11/06/2005, last modified the 18/08/2025
Source of the printed document:https://www.gaudry.be/en/java-api-javaee-rf-javax/inject/provider.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

  1. View the html document Language of the document:fr Manuel PHP : https://docs.oracle.com/en/java/, Interface Provider

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author of this site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.