REST-Annotations @Provider & @Context

@Provider:

@Provider is used to register the provider classes with the JAX-RS Runtime.

Different provider interfaces/classes where we can use @Provider Annotation:

There are some list of provider interfaces/classes are there which are going to registed using @Provider annotation which are given below

1. ParamConverterProvider-Contract for a provider of ParamConverter instances

2. MessageBodyReader-Contract for a provider that supports the conversion of a stream to a Java type

3. MessageBodyWriter-Contract for a provider that supports the conversion of a Java type to a stream

4. ContextResolver-Contract for a provider that supplies context information to resource classes and other providers 

 @Context: 

Purpose of @Context:

In order to access the predefined obj's there are there with the JAX-RS we need to use @Context annotaion so that JAX-RS Runtime will injects into our Resource class.

Different places where we can use @Contex Annotation:

There are predefined obj's that are there in JAX-RS API where if we wanted to access those obj so let the JAX-RS Runtime to inject those predefined obj's (like UriInfo obj) into pur Resource class for this we need to annotate with @Context annotation.

We can use @Context to get the predefined obj's that are there in JAX-RS API some of them are

1. UriInfo-An injectable interface that provides access to application and request URI information

2. HttpHeaders-An injectable interface that provides access to HTTP header information

3. Providers interface-An injectable interface providing runtime lookup of provider instances

4. SecurityContext

5. Request [For caching purpose]