Original approach was to upgrade one version of play at a time and keep all functionality. This turned out incredible difficult given all the interdependencies between libraries and scala version. See old branch: https://opensource.ncsa.illinois.edu/bitbucket/projects/CATS/repos/clowder/compare/commits?sourceBranch=refs%2Fheads%2F2.0&targetBranch=refs%2Fheads%2Fdevelop.

New approach is as follows:

• Remove all unused and legacy code
  • XML RDF export
  • Rabbitmq monitoring using manager API
  • Geostreams API
• Modify code to be compatible with newer versions of play
  • Every plugin should become a Guice Trait + Implementation
• Upgrade everything to latest version of play (
  • Play 2.7 or 2.6 depending on required Scala version by underlying libraries
  • Mongo drivers
    • http://mongodb.github.io/mongo-java-driver/ (this might be our safest bet)
    • http://mongodb.github.io/mongo-java-driver-reactivestreams/
    • https://mongodb.github.io/mongo-scala-driver/
• Migrate authentication / authorization:
  
  • https://github.com/mohiva/play-silhouette

Play 2.6 Upgrade

• Upgrade Play 2.2.0 to 2.2.6
• https://www.playframework.com/documentation/2.5.x/Migration23
• https://www.playframework.com/documentation/2.5.x/Migration24
  • http://www.silhouette.rocks/ - Secure Social replacement
    • example: https://github.com/adrianhurt/play-silhouette-credentials-seed
• https://www.playframework.com/documentation/2.5.x/Migration25
• https://www.playframework.com/documentation/2.6.x/Migration26

Sbt migration: http://www.scala-sbt.org/0.13/docs/Migrating-from-sbt-012x.html