The @CookieParam annotation allows you to inject the value of a cookie or an object representation of an HTTP request cookie into your method invocation

GET /books?num=5

@GET
public String getBooks(@CookieParam("sessionid") int id) {
...
}

@GET
public String getBooks(@CookieParam("sessionid") javax.ws.rs.core.Cookie id) {...}

Like PathParam, your parameter type can be an String, primitive, or class that has a String constructor or static valueOf() method. You can also get an object representation of the cookie via the javax.ws.rs.core.Cookie class.