Speaking Java

In the last post we saw how to spin a http/2 server using embedded jetty. In this post we will see, how to use asynchronous servlet (as well as AIO a.k.a non-blocking IO) and why that is important? Asynchronous Servlets ≠ Asynchronous IO [1] The concept of Asynchronous Servlets is often confused with Asynchronous IO or the use of NIO. However, Asynchronous Servlets are not primarily motivated by asynchronous IO, since: HTTP Requests are mostly small and arrive in a single packet. Servlets rarely block on requests. Many responses are small and fit within the server buffers, so servlets often do not block writing responses. Asynchronous Servlets Use-case The main use-case for asynchronous servlets is waiting for non-IO events or resources. Many web applications need to wait at some stage during the processing of a HTTP request, for example: waiting for a resource to be available before processing the request (e.g., thread, JDBC Connection) waiting for an applica...

Have you ever wanted to configure internal Java servers using HTTP/2 (or H2 in short), because of the following advantages? Internal clients making concurrent calls, can now use a single connection by utilizing the multiplexing nature of HTTP/2. Server will/can use less threads as there are less connections overall. Servers can also push resources/data and can communicate using websockets But what if you don’t want to go through tedious process of setting up SSL/TLS certificates? HTTP/2 insists on SSL/TLS as no browser supports HTTP/2 on insecure mode. Or what if you want to save every bit of CPU and time by skipping encryption and decryption? You are at the right place. Since everyone nowadays is moving towards (or talking about) micro services, we will also configure Jetty HTTP/2 server in embedded mode. What more? We are also going to configure our server to use Asynchronous Servlets and Asynchronous IO (aka non-blocking IO or NIO) in Part-2 of this article. ...