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Scala Project Builds in Gradle, SBT, and Maven

A sample multi-module project that compiles and builds in Gradle, SBT, and Maven to show the various ways to get Scala code built.

Why Scala:

Martin Odersky -- We are in the middle of a paradigm shift [in] the industry, and there will be a new equilibrium between functional and object-driven programming, and Scala is leading that.

#Features

  • Build tools of JEE, Maven and Gradle.

    • multi-module builds
    • multi-multi-multi modules builds
    • need to add Scala into these environments
    • cross compiling can be tricky, but manageable
      • mixing means java first or scala first
      • keeps things seperate, at least in main and test

  • SBT is the Simple (or Scala) Build Tool

    • Default build tool for Scala,
    • Martin Odersky says Scala will continue to allow all three.

  • Testing - Recommend ScalaTest

  • JavaLib

    • running a ScalaTest as a jUnit test
    • class is ScalaTest

  • ScalaLib

    • run ScalaTest in additon to jUnit
    • ScalaFeatureSpecTest
    • ScalaFlatSpecTest
    • ScalaFunSuiteTest

  • Show build systems example

    • Maven
      • JavaLib - no changes
      • ScalaLib - added scalatest - pom.xml
      • mvn clean test
    • Gradle
      • build.gradle
      • JavaLib
        • add beforeTest handle to see tests when they run
      • ScalaLib
        • add scalatest plugin
      • gradle clean test
    • Sbt
      • project/build.sbt - add scalatest dependency
      • sbt clean test

  • Testing code in ScalaTest

    • Pascal's Triangle
    • Possible iterations - iterative and recursive
    • PascalTriangleTest - look at examples
      • Java Iterative
        • PascalJava
        • show Java to Scala conversions of List[List[Long]]
      • Scala Recursive
        • PascalScala
        • show prettyPrint code
      • Scala worksheet - O Captian, My Captian
        • investigate a simpler algorithm
        • determine structure to use
        • need a structure to generate the next value on the fly