SBT 多项目构建中的 build.properties

Question

I have a multi project build, the structure of the project looks like this:

• project

  • build.properties

  • plugins.sbt

• subprojects

  • subProj1

    • project/

      • build.properties

Now can we have 2 different sbt versions in 2 build.properies files? Like we use sbt 0.13 in root project and 1.3 under subProj1? Or do sbt ignores the build.properties file for subprojects like it uses to do with plugins.sbt ?

Answer 1

build.properties is only relevant to the sbt launcher script which downloads appropriate version artefacts. After sbt "mother ship" is launched then sbtVersion should not be modified anymore as per inspect sbtVesion :

> inspect sbtVersion
[info] Setting: java.lang.String = 1.4.7
[info] Description:
[info]  Provides the version of sbt.  This setting should not be modified.

Considering project structure in OP, after sbt is launched at the root level, then build.properties files other than <root>/project/build.properties will be ignored.