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Play Framework 2.2.3 Subproject Template

This Play Framework template demonstrates multiple subprojects as you might use them with a traditional Software-as-a-Service application. It uses Java but can be adapted for Scala with minimal changes.

Pull Requests are welcome here, as I'm sure there are some things I missed.

Projects in this template

Root Project

The "root" project is essentially a container for the individual subprojects (stored in the /modules folder). The root project has the master build.sbt file which tells SBT this is a multi-project build. It also contains global application-level functionality like returning the SHA of the current git commit. Otherwise, all functionality should go in a subproject / module.

Common Project

This project is a container for all globally shared resources, including javascript, css, and images, as well as shared Java and Scala libraries.

Customer Project

This project is an example of an application that the customer might use.

Admin Project

This project is an example of an application an administrator might use.

Usage

  1. Clone this repo to your local workstation.

  2. Download Typesafe Activator

  3. Load the Play Framework project in sbt by using activator as follows:

cd /my/project/directory
activator
  1. Once in sbt/activator, run the application:
run
  1. The app should open a TCP listener at port 9000 on localhost. Now try these URLs from the routes files:
  1. To run the project in IntelliJ, from the sbt/activator console type idea and use IntelliJ to open the folder containing this project.

Gotcha's

Namespace Conflicts

One of the common challenges of setting up multi-project builds is namespace conflicts. These arise from at least two areas.

First, the default Java package of each a .java file in the controllers folder is simply package controllers. When working with one project, this package is unique, but when working with multi-project, neither the JVM nor IntelliJ will know which controllers package you're referring to, if each of your projects has files in the controllers package.

Second, one of the best features of Play Framework is its intuitve routes file. Play achieves the simple format by using an sbt feature called source generation to convert a project's routes files into Java/Scala code that IntelliJ and the JVM can understand. I often ran into issues where the namespaces used by these files were off. This template addresses that issue in the way that the files are named and the contents of each project's build.sbt file.

In general, the recommended packages are:

package controllers.admin
package controllers.admin.subpackage
package controllers.customer
package controllers.customer.subpackage
package models.common.whatever
etc.

More Documentation

Check out the docs folder for information on configuring IntelliJ IDEA, Logging, and more.

Attribution

Most of this template was built by carefully reading http://www.playframework.com/documentation/2.2.3/SBTSubProjects. I also benefitted from the template shown at https://github.com/cnicodeme/play2.2-subproject.