Ebean #Transactional annotation not working on Heroku - heroku

Question

I have a Play Framework 2.1.1 app running on Heroku.
I've written a bunch of new code in my local dev environment, and it works fine, but when I deploy it to Heroku the app crashes and I get this in the logs:
Configuration error: Configuration error[Cannot register class [models.Article] in Ebean server]
Oops, cannot start the server.
...
Caused by: java.lang.NoClassDefFoundError: com/avaje/ebean/bean/EnhancedTransactional
...
Caused by: java.lang.ClassNotFoundException: com.avaje.ebean.bean.EnhancedTransactional
...
Process exited with status 255
State changed from starting to crashed
When I remove the #Transactional annotations from my models, I no longer get the errors.
Here is an example of how I'm using #Transactional in one of my models:
#Transactional
public static Product find(Long id) {
return find.byId(String.valueOf(id));
}
Has anyone experienced this or have any idea why it works fine locally, but not in Heroku?
Per request, here is my build.scala
import sbt._
import Keys._
import play.Project._
object ApplicationBuild extends Build {
val appName = "myapp"
val appVersion = "1.0-SNAPSHOT"
val appDependencies = Seq(
// Add your project dependencies here,
"postgresql" % "postgresql" % "8.4-702.jdbc4",
"com.typesafe" %% "play-plugins-mailer" % "2.1.0",
"com.stripe" % "stripe-java" % "1.15.1",
"com.amazonaws" % "aws-java-sdk" % "1.3.11",
javaCore,
javaJdbc,
javaEbean
)
val main = play.Project(appName, appVersion, appDependencies).settings(
// Add your own project settings here
)
}