This plugin provides an alternative to BoneCP as the connection pool manager in Play 2.1. The main reason for doing this is that I have seen issues with connections not being released properly by BoneCP when there are low max connections available.
To use this plugin you need to add dbplugin=disabled to your conf/application.conf file.
Add val c3p0 = RootProject(uri("git://github.com/hadashi/play2-c3p0-plugin.git")) to your project/Build.scala
and then add .dependsOn(c3p0) to the play.Project line.