[2.1] How to package a Play application into a single, runnable JAR

[Bo]

Hello!

I'm making a Play application for my Master's thesis (https://github.com/blopker/Pheme) and I need to package it as a single JAR file that I can start from another program. For instance, I'd like to be able to import the JAR file and run something like Pheme.run(); from another Java application.

Now, I've been using Java for a while, but I'm new to SBT. I've found three SBT plugins that may be useful.

• https://github.com/adamw/xsbt-proguard-plugin
• https://github.com/sbt/sbt-assembly
• https://github.com/sbt/sbt-onejar

For each option I am able to successfully configure the plugins.sbt file so that the plugin will download. However, I cannot for the life of me get Build.scala configured correctly. I'm starting to think this can't be done with the Play framework, which is a shame because this type of deployment could be very useful.

Does anyone know how to get one of these plugins working with Play?

[Bo]

I got it working! Kinda... I was able to get the onejar plug in working, but not with any ebean models. This is pretty terrible, but workable.

I did a write up here: https://github.com/blopker/one-jar-test if anyone is interested.

This thread got a lot of views, but no replies! Sad times.

[Derek Williams]

Bo, I saw that you were able to get sbt-onejar to work, so this may not be timely, but I was able to use YAJSW successfully. Here's a post with some details http://naoki.sato.name/lab/archives/263 Should work for Linux, OSX with some small changes to the instructions.

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Derek Williams
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[Bo]

Hey Derek, sweet post.

Though YAJSW doesn't do exactly what I'm looking for (I think? Maybe I'm misunderstanding). I want my Play app to essentially be one executable Jar file that I can start from another Java application.

One Jar allows me to do that, but I'm unable to use Ebeans with it. However, for my use case this works for now!

Thanks!

[Stephane C]

Bo,

Even if your app is not packaged as a single jar, you can start from another process by executing "java" with the correct args. This can be done easily using ProcessBuilder.

Be careful, I am no expert but when you are merging other people jars into your deliverable, you may accidentally violate their license (LGPL style licenses typically ).

Best