Sometimes you want to examine what impact would a new JAX-RS filter have on performance of your application. Whether your custom message body provider is as fast as you though or you simply want to find out the throughput of your JAX-RS resources or client instances. Recently we were looking into this area and we’ve created few utilities that may make your life easier if you want to write micro-benchmarks for JAX-RS applications.
Support for Entity Filtering in Jersey introduces a convenient facility for reducing the amount of data exchanged over the wire between client and server without a need to create specialized data view components. The main idea behind this feature is to give you means that will let you selectively filter out any non-relevant data from the model before sending the data to the other party.
Entity Data Filtering is not a new feature but so far the support was limited to MOXy JSON provider. Since Jersey 2.16, we support also Jackson (2.x) JSON processor and in this article we’re going to take a look into it in more detail.
Few times I’ve ran into a situation in which I wanted to return only a part of entity I was working with, in my service, to the client-side. Feature that would allow me to send this partial set of fields should not only be driven by my own filtering rules but it also should take into consideration application roles the current user is in. It’s not an uncommon use-case I’d say so in Jersey we’d come up with the Entity Filtering concept that would allow you to do such a thing: sending subgraph of entities from server to client (and vice versa), define your own filtering rules and make sure users get only the fields they are supposed to see.
Since JAX-RS 2.0 you can use Bean Validation to validate inputs received from users and outputs created in your application. It’s a handy feature and in most cases it works great. But what if you’re using also MVC and you want to display custom error page if something goes wrong? Or what if you want to handle Bean Validation issues in a slightly different way than JAX-RS implementation you’re using does? This article will give you some answers to these questions.