Scala

Build

to clean and build the jar

mvn clean package
mvn clean package -Dtest=MyTestClass1

to clean, build jar and install jar in local .m2 repo

mvn clean install

to source from local repo in pom.xml

<repositories>
  <repositor>
    <id>mylocal-repo</id>
    <url>file://Users/jwei/.m2/repository/</url>

to to dependency tree (how pom source dependency)

mvn dependency:tree

to print out what scope are omitted

mvn dependency:tree -Dverbose

for scala REPL, run sbt console

with sbt console, sbt will aslo pull all class in the project directory to your REPL session. try to create a class in test.scala

class employee{
  val name = "jay";
  val age = 36;
}

then run sbt console,

scala> val emp = new employee
emp: employee = employee@3752b4f2
scala> println(emp.name)
jay
scala> println(emp.age)
36

in you wish to import some library in REPL, such as import org.apache.spark.SparkContext

exit REPL, and start sbt,

set libraryDependencies += "org.apache.spark" % "spark-core_2.10" % "2.0.2"  
show libraryDependencies
session save

or just put it in a build.sbt file then console will pull the dependency

1)sbt file structure

---

2) after 'sbt package' below two folder will be created

---

3) build.sbt format

---

4) to reload dependencies

---