As you can see, JAX-RS eases a lot of object parsing and representation:

    @GET
    @Path("getUserFromBean")
    @Produces(MediaType.APPLICATION_JSON)
    public Response getUserFromBean(){
        userFromBean = userBean.getUser();
        return Response.ok(userFromBean).build();
    }

    @GET
    @Path("getUserFromLocal")
    @Produces(MediaType.APPLICATION_JSON)
    public Response getUserFromLocal(){
        return Response.ok(userLocal).build();
    }

By using a Response returning object and @Produces(MediaType.APPLICATION_JSON), you give the framework the hard job of parsing your user object to a JSON representation. Lots of effort is saved in a few lines!

You could also inject the user using a producer (the @Produces annotation). Check the Jakarta CDI recipe from Chapter 1, New Features and Improvements, for more details.