How to set system property for xsbt-web-plugin's jetty()?

Question

I've migrated my project to 0.13.5 and started using the xsbt-web-plugin.

I'd like to configure logback to be using a configuration file outside the classpath which is set by a system property logback.configurationFile (so I can keep the logconfig outside the war file).

Previously I would simply set:

System.setProperty("logback.configurationFile", "/some/path/logback.xml")

inside the project/build.scala and logback would pick it up.

However, after upgrading sbt to 0.13.5 and migrating to the xsbt-web-plugin system properties set in sbt don't seem to be available at runtime(jetty).

I've tried setting system properties in different ways, also by passing it along using the -D flag when starting sbt.

On the sbt console I can see the property:

eval sys.props("logback.configurationFile")
[info] ans: String = /some/path/logback.xml

But it's not available inside the webapp.

Any ideas on how to set system properties to be available inside the webapp?

I've tried both jetty() and tomcat(). Same behaviour.

Update: I ended up with:

jetty(options = new ForkOptions(runJVMOptions = Seq("-Dlogback.configurationFile=/some/path/logback.xml")))

that works.

Answer 1

Use javaOptions in container += "-Dlogback.configurationFile=/some/path/logback.xml" as described in Set forked JVM options.

javaOptions alone (without in container) should work, too, as could be seen in inspect actual under Dependencies and Delegates:

[play-new-app] $ inspect actual container:javaOptions
[info] Task: scala.collection.Seq[java.lang.String]
[info] Description:
[info]  Options passed to a new JVM when forking.
[info] Provided by:
[info]  {file:/Users/jacek/sandbox/play-new-app/}root/container:javaOptions
[info] Defined at:
[info]  /Users/jacek/sandbox/play-new-app/build.sbt:26
[info] Dependencies:
[info]  */*:javaOptions
[info] Delegates:
[info]  container:javaOptions
[info]  *:javaOptions
[info]  {.}/container:javaOptions
[info]  {.}/*:javaOptions
[info]  */container:javaOptions
[info]  */*:javaOptions
[info] Related:
[info]  */*:javaOptions