com.opensymphony.xwork2.inject

## Interface Container

- All Superinterfaces:
    Serializable
  All Known Implementing Classes:
    MockContainer

      public interface Container
      extends Serializable

  Injects dependencies into constructors, methods and fields annotated with `Inject`. Immutable.

  When injecting a method or constructor, you can additionally annotate its parameters with `Inject` and specify a dependency name. When a parameter has no annotation, the container uses the name from the method or constructor's `Inject` annotation respectively.

  For example:

        class Foo {

          // Inject the int constant named "i".
          @Inject("i") int i;

          // Inject the default implementation of Bar and the String constant
          // named "s".
          @Inject Foo(Bar bar, @Inject("s") String s) {
            ...
          }

          // Inject the default implementation of Baz and the Bob implementation
          // named "foo".
          @Inject void initialize(Baz baz, @Inject("foo") Bob bob) {
            ...
          }

          // Inject the default implementation of Tee.
          @Inject void setTee(Tee tee) {
            ...
          }
        }

  To create and inject an instance of `Foo`:

        Container c = ...;
        Foo foo = c.inject(Foo.class);

  Author:
    crazybob@google.com (Bob Lee)
  See Also:
    `ContainerBuilder`

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `DEFAULT_NAME` Default dependency name.

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `<T> T` | `getInstance(Class<T> type)` Convenience method. Equivalent to `getInstance(type, DEFAULT_NAME)`.
    `<T> T` | `getInstance(Class<T> type, String name)` Gets an instance of the given dependency which was declared in `ContainerBuilder`.
    `Set<String>` | `getInstanceNames(Class<?> type)` Gets a set of all registered names for the given type
    `<T> T` | `inject(Class<T> implementation)` Creates and injects a new instance of type `implementation`.
    `void` | `inject(Object o)` Injects dependencies into the fields and methods of an existing object.
    `void` | `removeScopeStrategy()` Removes the scope strategy for the current thread.
    `void` | `setScopeStrategy(Scope.Strategy scopeStrategy)` Sets the scope strategy for the current thread.

- - ### Field Detail

    - #### DEFAULT_NAME

          static final String DEFAULT_NAME

      Default dependency name.
      See Also:
        Constant Field Values

  - ### Method Detail

    - #### inject

          void inject(Object o)

      Injects dependencies into the fields and methods of an existing object.
      Parameters:
        `o` - object to inject

    - #### inject

          <T> T inject(Class<T> implementation)

      Creates and injects a new instance of type `implementation`.
      Type Parameters:
        `T` - type
      Parameters:
        `implementation` - of dependency
      Returns:
        instance

    - #### getInstance

          <T> T getInstance(Class<T> type,
                            String name)

      Gets an instance of the given dependency which was declared in `ContainerBuilder`.
      Type Parameters:
        `T` - type
      Parameters:
        `type` - of dependency
        `name` - of dependency
      Returns:
        instance

    - #### getInstance

          <T> T getInstance(Class<T> type)

      Convenience method. Equivalent to `getInstance(type, DEFAULT_NAME)`.
      Type Parameters:
        `T` - type
      Parameters:
        `type` - of dependency
      Returns:
        instance

    - #### getInstanceNames

          Set<String> getInstanceNames(Class<?> type)

      Gets a set of all registered names for the given type
      Parameters:
        `type` - The instance type
      Returns:
        A set of registered names or empty set if no instances are registered for that type

    - #### setScopeStrategy

          void setScopeStrategy(Scope.Strategy scopeStrategy)

      Sets the scope strategy for the current thread.
      Parameters:
        `scopeStrategy` - scope strategy

    - #### removeScopeStrategy

          void removeScopeStrategy()

      Removes the scope strategy for the current thread.

Copyright © 2000–2026 Apache Software Foundation. All rights reserved.