This guide will get you started using Spark on Heroku/Cedar. Spark is basically a clone of Sinatra for Java. 'Nuff said.

Create your app

Create a single Java main class in src/main/java/

import static spark.Spark.*;
import spark.*;
View compile
#!/usr/bin/env bash
# bin/compile <build-dir> <cache-dir>
# fail fast
set -e
BIN_DIR=$(cd $(dirname $0); pwd) # absolute path
# parse args

A better way to set up Java web apps

If you're building a Java web app that you yourself or your organization will be deploying then you can save yourself a lot of trouble by avoiding the whole build-to-war + deploy-to-server approach. Instead, you should build your web app as a normal Java application with an embedded web app server. Don't build a WAR, just compile the code and serve the files out of their source location. This has the following advantages:

  • You can code and test iteratively because you don't have to copy files and create war packages every time you make a change. This is similar to what the mvn jetty:run command is being used for by many developers today.
  • You run the same exact code in production as you do in development. Hopefully I don't have to elaborate on the advantages of that. Most developers today use mvn jetty:run or similar to achieve a quick, iterative dev cycle. But come time for deployment, they build a WAR and throw it over the wall to be deployed in some app server
View gist:1026008
java.util.jar.JarFile jar =
new java.util.jar.JarFile((thispackage.ThisClass.class.getProtectionDomain()
mvn archetype:generate -DarchetypeCatalog= -DarchetypeGroupId=com.force.sdk -DarchetypeArtifactId=springmvc-archetype