Speed Up sbt in China

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

Currently sbt uses https by default. However, the Great Firewall of China makes https visits to websites out of China slow.

Proxy¶

If you have access to proxy server, it is probably the most convenient way.

HTTP Proxy

export JAVA_OPTS="$JAVA_OPTS -Dhttp.proxyHost=yourserver -Dhttp.proxyPort=8080 -Dhttp.proxyUser=username -Dhttp.proxyPassword=password"
sbt

Socks Proxy

 sbt -DsocksProxyHost=proxy_ip -DsocksProxyPort=port

Repository Mirror (Proxy Repository)¶

sbt uses Ivy to resolve library dependencies. However, unlike Gradle sbt does NOT inherit Maven configurations. You have to configure sbt separately. It is really easy to set up proxy repositories for sbt. All you have to do is to add the following section into the file ~/.sbt/repositories.

[repositories]
    local
    aliyun: http://maven.aliyun.com/nexus/content/groups/public/
    central: http://repo1.maven.org/maven2/

The repositories are used in the order local > aliyun > central. You can add other repositories similarly (using the ke: value format). Ali Maven Mirror is great for use in China.