SBT/build.sbt: One percent symbol or multiple percent symbol for Java and Scala dependencies?
Briefly

Use %% in library dependencies for Scala-specific libraries, like 'org.scalikejdbc %% scalikejdbc % 3.1.0'.
Use a single % in library dependencies for other JVM dependencies, like 'com.h2database % h2 % 1.4.196'.
Read at Alvinalexander
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