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However having all of your dependencies defined in your build descriptor is important for application portability and repeatability of deployment. You could, of course, just download Webapp Runner and use it to launch your application without doing this. Configure Maven to download Webapp RunnerĪlthough not necessary for using Webapp Runner it’s a good idea to have your build tool download Webapp Runner for you since your application will need it to run. You now have a complete Java web app in the helloworld directory. (you can pick any groupId or artifactId). Generating project in Interactive modeĭefine value for property 'groupId': : com.exampleĭefine value for property 'artifactId': : helloworld Create an application if you don’t already have one $ mvn archetype:generate -DarchetypeArtifactId=maven-archetype-webapp Webapp Runner is open source so you can view or contribute to the source code. This takes advantage of Tomcat’s embedded APIs and is similar to an option that Jetty offers: Jetty Runner. Webapp Runner will then launch a Tomcat instance with the given war deployed to it. INFO: Starting Servlet Engine: Apache Tomcat/8.0.30ĥ:21:44 PM .ContextConfig webConfigĥ:21:44 PM start INFO: Initializing ProtocolHandler ĥ:21:44 PM .StandardService startInternalĥ:21:44 PM .StandardEngine startInternal When using Webapp Runner you’ll launch your application locally and on Heroku with a command like this: $ java -jar webapp-runner.jar application.warĭeploying app from: /Users/johnsimone/dev/gitrepos/devcenter-webapp-runner/target/webappRunnerSample.warĥ:21:44 PM init

Basic Java knowledge, including an installed version of the JVM and Maven.You can also use almost any existing Maven webapp project. This article will walk you through building an application that launches with Webapp Runner and deploying that application to Heroku.įollow each step to build an app from scratch, or skip to the end get the source for this article. It’s a regular JAR file that can be executed and configured using the java command. No previous steps to install Tomcat are required when using Webapp Runner. Webapp Runner allows you to launch an application in a Tomcat container on any computer that has a JRE installed.