Scala 3

Scala 3 setup

Jacob Xie published on August 17, 2021

2 min, 214 words

Categories: Doc

Scala 3

JDK 11

sudo apt-get install openjdk-11-jdk

make sure $JAVA_HOME is set in ~/.bashrc:

export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64

SBT

echo "deb https://repo.scala-sbt.org/scalasbt/debian all main" | sudo tee /etc/apt/sources.list.d/sbt.list
echo "deb https://repo.scala-sbt.org/scalasbt/debian /" | sudo tee /etc/apt/sources.list.d/sbt_old.list
curl -sL "https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x2EE0EA64E40A89B84B2DF73499E82A75642AC823" | sudo apt-key add
sudo apt-get update
sudo apt-get install sbt

(Optional) Set sbt mirror

create repositories (huawei mirror) under ~/.sbt/:

[repositories]
local
huaweicloud-maven: https://repo.huaweicloud.com/repository/maven/
maven-central: https://repo1.maven.org/maven2/
sbt-plugin-repo: https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases, [organization]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]

(Optional) Set global repo for all projects (rather than each project holds its own repo)
```
cd /etc/sbt
```
then sudo vim sbtopts add one line at the bottom:
```
-Dsbt.override.build.repos=true
```
Check everything, first by executing sbt and enter to sbt shell

check sbt version:
```
sbtVersion
```
check global repo if override:
```
show overrideBuildResolvers
```
show resolvers:
```
show fullResolvers
```
Create a new scala3 project
```
sbt new scala/scala3.g8
```
(Optional) vs-code extension Metals, again please make sure that $JAVA_HOME is set.