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Generated evolution scripts in projects without Play's layout #930
Description
In a project that disables Play's layout (disablePlugins(PlayLayoutPlugin)), the resources are in src/main/resources instead of conf. With a simple play.evolutions[.db.<name>].path, like the default evolutions, Play's evolutions still look for the scripts in conf/<path>/<name>/ on the filesystem first, and only then on the classpath, and Play Ebean writes the generated script to conf/<path>/<name>/1.sql as well. So:
- The generated script doesn't get packaged, so it's missing in production.
- In dev and test mode, it takes precedence over a hand-written
src/main/resources/evolutions/<name>/1.sql, which then only production uses.
The docs (#931) describe workarounds: generate the script into ./src/main/resources/evolutions in dev and test mode, and use the default path in production; or turn off generating the script, and delete a generated copy.
Proper support would need to know where the project's resources really are, e.g. from the sbt plugin. Guessing it from which folders exist doesn't work: it can't tell a conf folder that Play Ebean created itself apart, misses custom resource directories, and can change which script Play applies.
Found while looking into #1.
Activity
PromanSEW commentedon Oct 13, 2026
In
PlayServiceproject I use this setting:mkurz commentedon Oct 13, 2026
Thanks, that's a nicer variant: with
devSettings, onlysbt runuses./src/main/resources/evolutions, and production keeps the default path, so it applies the packaged script without any override. I checked it with an application without Play's layout: in dev mode, Play Ebean writessrc/main/resources/evolutions/default/1.sql, and the staged application applies it.One thing to be aware of:
devSettingsonly apply tosbt run, not tosbt test. In tests, Play Ebean still writesconf/evolutions/default/1.sql, and the tests apply that copy. To use the same location in tests, set the path in the test application's configuration too, e.g.new GuiceApplicationBuilder().configure("play.evolutions.path", "./src/main/resources/evolutions").