Package javax.ws.rs

Annotation Interface ConstrainedTo

@Target(TYPE) @Retention(RUNTIME) @Documented public @interface ConstrainedTo
Indicates the run-time context in which an annotated JAX-RS provider is applicable. If a @ConstrainedTo annotation is not present on a JAX-RS provider type declaration, the declared provider may be used in any run-time context. If such a annotation is present, the JAX-RS runtime will enforce the specified usage restriction.

The following example illustrates restricting a MessageBodyReader provider implementation to run only as part of a JAX-RS client run-time: 

  @ConstrainedTo(RuntimeType.CLIENT)
  public class MyReader implements MessageBodyReader {
      ...
  }

The following example illustrates restricting a WriterInterceptor provider implementation to run only as part of a JAX-RS server run-time: 

  @ConstrainedTo(RuntimeType.SERVER)
  public class MyWriterInterceptor implements WriterInterceptor {
      ...
  }

It is a configuration error to constraint a JAX-RS provider implementation to a run-time context in which the provider cannot be applied. In such case a JAX-RS runtime SHOULD inform a user about the issue and ignore the provider implementation in further processing.

For example, the following restriction of a ClientRequestFilter to run only as part of a JAX-RS server run-time would be considered invalid: 

  // reported as invalid and ignored by JAX-RS runtime
  @ConstrainedTo(RuntimeType.SERVER)
  public class MyFilter implements ClientRequestFilter {
      ...
  }
Since:
2.0

  • Required Element Summary

    Required Elements
    Modifier and Type
    Required Element
    Description
    RuntimeType
    value
    Define the constraint type to be placed on a JAX-RS provider.