sbt-antlr4 VS sbt-assembly

Now we are ready to create a new project. For project building i'll use sbt, but it is also possible to use maven or gradle. After project creation we need to add antlr4 compiler plugin – sbt-antlr4. Also, we will need a shapeless for codec derivation, so let's add this library too. After all, plugins.sbt and build.sbt will look like this:

sbt-assembly is still my go-to. So what I'd prefer is the combination of sbt-assembly (to build my .jar that I can just java -jar anytime I want) and sbt-jib (to construct my OCI image including my assembly .jar for deployment in some container orchestration environment).

You may also use sbt-assembly to produce an uber JAR that embeds the Scala stdlib together with your code, which means that now for running your program you only need a JRE like java -jar app-assembly.jar. This option is great because now if you start adding dependencies to your project those are also included in this massive JAR.

Sbt-assembly defaults to silently concatenating configs. But even if it didn't, the configs wouldn't be in any particular order when resolving.

Ticket of record is https://github.com/sbt/sbt-assembly/issues/391

With the sbt-assembly plugin you can create JAR-files with all of its dependencies (fat JARs). sbt assembly creates this target/scala-2.12/apply-at-vdb-assembly-0.1.0-SNAPSHOT.jar which has a size of around 42MB: