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Spark 2.9.3 released (October 2020)

Includes update to latest Jetty version, methods for getting all routes and unmapping of routes, etc

For full list goto

Spark 2.9.3 is available for download on Maven Central.

See the commit history on GitHub for details.

Spark 2.9.2 released (July 2020)

A maintenance release of Spark.

Spark 2.9.2 is available for download on Maven Central.

See the commit history on GitHub for details.

Spark 2.9.1 released (May 2019)

There was security problems identified in the Jetty version used in Spark 2.9.0. Spark 2.9.1 uses the newest Jetty version where these problems have been addressed.

Spark 2.9.1 is available for download on Maven Central.

See the commit history on GitHub for details.

Spark 2.9.0 released (March 2019)

Spark 2.9.0 makes the matched route path available, bumps Jetty to the latest version, adds support for .mjs files for MIME type auto detection and also includes some minor bug fixes.

Spark 2.9.0 is available for download on Maven Central.

See the commit history on GitHub for details.

Spark 2.8.0 released (Sept 2018)

Spark 2.8.0 makes the Session cookie HTTP only and bumps Jetty to the latest version. It also fixes a couple of bugs to allow configuring static files and exception mapping per Spark instance. Adds an awaitStop() method which blocks until the server has stopped.

Spark 2.8.0 is available for download on Maven Central.

See the commit history on GitHub for details.

Spark 2.7.2 released (March 2018)

Spark 2.7.2 fixes a security problem in the serving of static files. It also adds support for specific keystore aliases and bumps Jetty to the latest version

Spark 2.7.2 is available for download on Maven Central.

See the commit history on GitHub for details.

Spark 2.7.1 released (November 2017)

2.7.0 accidentally introduced a dependency on Jetty for one of the core classes. This dependency was removed in 2.7.1

Spark 2.7.0 released (November 2017)

A small release this time, probably the last before 3.0.0 Spark 2.7.0 is available for download on Maven Central.

See the commit history on GitHub for details.

Spark-kotlin 1.0.0-alpha released (May 2017)

At last, we’ve taken the step to kotlin and it is awesome. Spark-kotlin 1.0.0-alpha is available for download on Maven Central.

http.get("/java") {
    "Oops, are you looking for Java? You've entered the sublime domain of Kotlin"
If you like spark-kotlin give us a star on GitHub:

Spark 2.6.0 released (April 2017)

There are some big changes this time! Spark 2.6.0 is available for download on Maven Central.


Spark 2.5.1/2.5.2 static files vulnerability

Early November 2016 a vulnerability in how Spark 2.5/2.5.1 handles static files was exposed through a mailing list. We fixed it the same day we became aware of it, and a new version of Spark (2.5.2) was released.

The person who found the vulnerability says they tried to contact us for weeks and that we were unresponsive, but we would like to note that this attempted contact was limited to sending each of us an email using an obscure custom domain that the sender knew might get caught in gmail’s spam filter (they stated this in the email). Be assured that we do read emails and that this is the first email gmail has mistaken for spam in years.

Best practice for reporting vulnerabilities:

  1. Try to email us (preferably using a normal domain). Our emails are on the contact page.
  2. If 1 fails, create an issue on GitHub saying you need to talk to us about a vulnerability.
  3. If both 1 and 2 fails, create an issue on GitHub describing the vulnerability.
  4. If 1, 2 an 3 fails, feel free to expose the vulnerability in order to inform people. It’s not that we want to keep vulnerabilities a secret, but we want to users to have a fixed version of Spark to switch to once the vulnerability is exposed.

Spark 2.5 released (May 2016)

At last, Spark 2.5 is available for download on Maven Central. We made so many changes that we decided to skip version 2.4! … … … Okay, we did release 2.4, but there was a bug in the static file API. Since you can’t amend or remove a release on maven we had to do a new release.

New static file API:

staticFiles.header("Server", "Robustified Backend");

Convenience API for redirects:

redirect.get("/hi", "/hello");"/hi", "/hello");
redirect.put("/hi", "/hello");
redirect.delete("/hi", "/hello");
redirect.any("/hi", "/hello");

Instance API

The instance API is intended for advanced users, so the official documentation will still use the static api. Everything normally available in the static API is now available on objects you can instantiate:

// When using the instance API, the Service variable should
// be called 'http' for the semantic to make sense
// ie: http.get("..."),"..."), etc

public static void main(String[] args) {

static void igniteSecondSpark() {
    Service http = ignite();

    http.get("/basicHello", (q, a) -> "Hello from port 4567!");

static void igniteFirstSpark() {
    Service http = ignite()

    http.get("/configuredHello", (q, a) -> "Hello from port 8080!");

Route Overview

We’ve added an experimental feature which displays all the mapped routes of your application:

You can enable it like this:

RouteOverview.enableRouteOverview(); // overview available at /debug/routeoverview/
RouteOverview.enableRouteOverview("/my/overview/path"); // available at specified path

Spark Debug Tools

We’ve started a new project, called Spark Debug Tools (repo here)

There has also been other bugfixes and minor changes. See the commit history on GitHub for details.

Spark 2.3 released (Sep 2015)

Woop woop, Spark 2.3 is available for download on Maven Central.


Spark 2.2 released (May 2015)

Spark 2.2 is available for download on Maven Central.

New features

Spark survey results (Apr 2015)

About the survey

For the past couple of weeks we’ve been showing users on the documentation page a survey popup (in the lower right corner though, we’re not evil). A couple of hundred users have responded to the survey now, so we’ve stopped it. We’re sorry if this annoyed anyone, but hey, at least we’re sharing the results with you.

Survey results

Spark survey results image 1

As expected, a lot of our users (51%) use Spark to create REST APIs, but the amount of people who use Spark to create webpages is pretty high too (25%). Most people use Spark for personal projects (57%), but a lot also use it at work (42%).

A surprisingly high number of our users seem to be using Spark for educational purposes, which is cool. We’ve seen the most educational traffic from Brown University (thank you Miyazaki-sensei, if you have any feedback from you or your students, please let us know).

Note: It was possible to select as many alternatives as you wanted for this question, so keep in mind that there is a lot of overlap between the different groups.

Spark survey results image 2

As can be seen from the first question, about 80% of our users have not deployed their application. These people have been omitted from this chart, making the sample size approximately 50 people. Still, it indicates that Spark is a viable candidate for bigger projects.

Spark survey results image 3

No big surprises here. As most Spark users create REST APIs without any view, they have little interest in template engines. Good news for Freemarker users though, we will work on better code examples for you guys in the coming months, showing that it’s definitely possible (and easy) to create a web application with a MVC’ish structure in Spark!

Spark survey results image 4

We’re glad to see that 90% of our users think that Spark’s documentation is okay or better (“Good” being the largest group at 41%). If you find any faults or have any input regarding the documentation, please let us know. We would like all our users to think that our documentation is at least okay.

Spark 2.1 released (Dec 2014)

Per has been really busy at work lately, but Spark 2.1 is available for download on Maven Central. The new version is 2.1, not 2.1.0. Since we’re aiming to be a lightweight/micro web framework, we decided that having 3 digits was too much! Also, eight more versions will probably be more than we need before the next major release of Spark (3.0).


Spark 2.0.0 released (May 2014)

Spark 2.0.0 is available for download on Maven Central. Spark 2.0.0 is a complete rewrite of the old Spark core to provide support for the new Java 8 lambdas. The new paradigm is hugely based on the lambda philosophy, so Java 7 is officially not supported anymore. If you want to work with Java 7, you can still use Spark 1, but unfortunately it won’t be updated any longer. Please consider migrating to Java 8 if possible :)

Spark 2 Hello World

import static spark.Spark.*;

public class HelloWorld {
    public static void main(String[] args) {
        get("/hello", (req, res) -> "Hello World");