baocaifeng / scala-jre8-alpine

scala-jre8-alpine

• A light and simple scala docker container running in alpine Linux with curl and git.
• Alpine is a tiny linux OS.
• This container has only jre (no jdk), it's for pure scala, doesn't support java program.
• It's only 84M, ideally using in small scala project.

Scala

Scala combines object-oriented and functional programming in one concise, high-level language. Scala's static types help avoid bugs in complex applications, and its JVM and JavaScript runtimes let you build high-performance systems with easy access to huge ecosystems of libraries.

Docker

Docker is a containerized system, which can run on Windows, Linux, and Mac OS. It can easily package and transfer development environments.

how to use

1. Install Docker

2. Pull the scala-jre8-alpine image from DockerHub

docker pull baocaifeng/scala-jre8-alpine:1.0

3. Build image

You can also dowload Dockerfile from github and build it by yourself. To build, you need to specify the desired openjdk and scala versions via --build-arg parameters. By default, OPENJDK_TAG=8u151-jre-alpine, SCALA_VERSION=2.13.5

docker build --build-arg OPENJDK_TAG=<Your Openjdk Tag> --build-arg SCALA_VERSION=<Your Scala version> .

4. Create container

Mount host directory to container

mkdir <Your directory>
docker container run -it -d --rm -v $PWD/<Your directory>:/mnt/code --name <Container name> baocaifeng/scala-jre8-alpine:1.0
docker ps

Work in container just like in linux as usual

docker container exec -it autocomplete "/bin/sh"

5. Check version

git --version
scala -version
scalac -version

java -version

• git version 2.15.4
• Scala code runner version 2.13.5 -- Copyright 2002-2020, LAMP/EPFL and Lightbend, Inc.
• Scala compiler version 2.13.5 -- Copyright 2002-2020, LAMP/EPFL and Lightbend, Inc.
• openjdk version "1.8.0_151"
• OpenJDK Runtime Environment (IcedTea 3.6.0) (Alpine 8.151.12-r0)
• OpenJDK 64-Bit Server VM (build 25.151-b12, mixed mode)
• Attention ! jdk is not installed, there is no javac

demo

• In Demo.scala

import scala.io.StdIn.readLine

object Demo extends App {

    print("Enter your first name: ")
    val firstName = readLine()

    print("Enter your last name: ")
    val lastName = readLine()

    println(s"Your name is $firstName $lastName")

}

• In container

scalac Demo.scala
scala Demo