Resource (Java Platform SE 8 )
Keywords: javax.annotation.Resource class
Date: 2017-07-29

javax.annotation

## Annotation Type Resource

-     @Target(value={TYPE,FIELD,METHOD})
       @Retention(value=RUNTIME)
      public @interface Resource

  The Resource annotation marks a resource that is needed by the application. This annotation may be applied to an application component class, or to fields or methods of the component class. When the annotation is applied to a field or method, the container will inject an instance of the requested resource into the application component when the component is initialized. If the annotation is applied to the component class, the annotation declares a resource that the application will look up at runtime.

  Even though this annotation is not marked Inherited, deployment tools are required to examine all superclasses of any component class to discover all uses of this annotation in all superclasses. All such annotation instances specify resources that are needed by the application component. Note that this annotation may appear on private fields and methods of superclasses; the container is required to perform injection in these cases as well.

  Since:
    Common Annotations 1.0

- - ### Optional Element Summary

    Optional Elements
    Modifier and Type | Optional Element and Description
    --- | ---
    `Resource.AuthenticationType` | `authenticationType` The authentication type to use for this resource.
    `String` | `description` Description of this resource.
    `String` | `lookup` The name of the resource that the reference points to.
    `String` | `mappedName` A product specific name that this resource should be mapped to.
    `String` | `name` The JNDI name of the resource.
    `boolean` | `shareable` Indicates whether this resource can be shared between this component and other components.
    `Class<?>` | `type` The Java type of the resource.

- - ### Element Detail

    - #### name

          public abstract String name

      The JNDI name of the resource. For field annotations, the default is the field name. For method annotations, the default is the JavaBeans property name corresponding to the method. For class annotations, there is no default and this must be specified.
      Default:
        ""

  - - #### lookup

          public abstract String lookup

      The name of the resource that the reference points to. It can link to any compatible resource using the global JNDI names.
      Since:
        Common Annotations 1.1
      Default:
        ""

  - - #### type

          public abstract Class<?> type

      The Java type of the resource. For field annotations, the default is the type of the field. For method annotations, the default is the type of the JavaBeans property. For class annotations, there is no default and this must be specified.
      Default:
        java.lang.Object.class

  - - #### authenticationType

          public abstract Resource.AuthenticationType authenticationType

      The authentication type to use for this resource. This may be specified for resources representing a connection factory of any supported type, and must not be specified for resources of other types.
      Default:
        javax.annotation.Resource.AuthenticationType.CONTAINER

  - - #### shareable

          public abstract boolean shareable

      Indicates whether this resource can be shared between this component and other components. This may be specified for resources representing a connection factory of any supported type, and must not be specified for resources of other types.
      Default:
        true

  - - #### mappedName

          public abstract String mappedName

      A product specific name that this resource should be mapped to. The name of this resource, as defined by the `name` element or defaulted, is a name that is local to the application component using the resource. (It's a name in the JNDI `java:comp/env` namespace.) Many application servers provide a way to map these local names to names of resources known to the application server. This mapped name is often a global JNDI name, but may be a name of any form.

      Application servers are not required to support any particular form or type of mapped name, nor the ability to use mapped names. The mapped name is product-dependent and often installation-dependent. No use of a mapped name is portable.

      Default:
        ""

  - - #### description

          public abstract String description

      Description of this resource. The description is expected to be in the default language of the system on which the application is deployed. The description can be presented to the Deployer to help in choosing the correct resource.
      Default:
        ""

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