Chapter 49. Getting and Using Context Information

You specify that context information is to be injected into a field or a resource method parameter using the javax.ws.rs.core.Context annotation. Annotating a field or parameter of one of the context types will instruct the runtime to inject the appropriate context information into the annotated field or parameter.

Table 49.1, “Context types” lists the types of context information that can be injected and the objects that support them.

Context information is available to the following parts of a JAX-RS application:

All context information injected using the @Context annotation is specific to the current request. This is true in all cases including entity providers and exception mappers.

The JAX-RS framework allows developers to extend the types of information that can be injected using the context mechanism. You add custom contexts by implementing a Context<T> object and registering it with the runtime.