You can start the scala interpreter inside sbt using the console task. Nov 08, 2017 conceptual overview of how sbt performs project configuration the two stages of building the project. If you dont have it installed, download java from oracle java 8, oracle java 11. As it turns out, there are plenty of reasons for using sbt. The purpose of this project is to provide good support for sbt projects using a multi step compilation task, like play projects. In order to compile scala code, run scaladoc, and provide a scala repl, sbt needs the scala compiler jar. It will run when needed scalac for scala sources, javac for java source, plus pretty much any kind of sources as sbt has a plugin mechanism. Scala is unusual because it is usually installed for each of your scala projects rather than being installed systemwide. Both of the above options manage via sbt a specific scala version per scala project you create. Downloading source and api documentation jars is usually handled by an ide plugin.
This tutorial describes how to use sbt to compile and run a scala project, and package the p. Principled sbt, scala exchange london 2018, andrea peruffo. This is an excerpt from the scala cookbook partially modified for the internet. Setup using giter8 all of the following have instructions for windows mac linux install scala from here optional, sbt will install scala for you. There is a nice description in the recent blog decodified from mathias. Use the cookie settings link to activatedeactivate specific types of cookies. This should not be a normal dependency of the project, so sbt adds a dependency on scalacompiler in the special, private scalatool configuration. These plugins use the updateclassifiers and updatesbtclassifiers tasks, which produce an update report referencing these jars. And i do have autoimport and download sources andjavadocs enabled. From download sources in the official documentation of sbt. By default, sbt also adds a dependency on the scala library with this version. Sbt for managing the dependencies and building for the scala project. It may be desirable to have more control over this in.
Once you have completed these steps sbt should happily download the scala. Sbt makes me want to give up scala after years of using and not particularly liking maven for java projects, and with getting by with a simple sbt file for scala work, i now have a more complex scala project and consequently im having to actually learn sbt. You can run the project with sbt run or enter the scala repl with sbt console. First, make sure you have the java 8 jdk or java 11 jdk installed. This causes sbt to use jdk even when java available on path is jdk 8 or 11.
It explains the basic configuration required to compile, test, and run a project using sbt. But a tool named sbt was the first build tool that was specifically created for scala, and these days its supported by lightbend, the company that was cofounded by scala creator martin odersky that also maintains akka, the play web framework, and more. The most popular way to get scala is either using scala through sbt, the scala build tool, or to use scala through an ide. How to install scala, sbt and spark in ubuntu balas blog. Jun 29, 2016 how to package a scala project to a jar file with sbt. So, you can go ahead and expand your scala project and in the scala packages entry, right click on and select new scala object. The first time you run sbt, it may take a while to download all the dependencies it needs, but after that.
Conceptual overview of how sbt performs project configuration the two stages of building the project. When you import a project and have download sbt sources checked in preferences build, execution. First of all, sbt was developed as a scala build tool from the very beginning. Weve previously discussed the scala build tool, sbt, and how easy it is to extend its abilities using plugins. Use the console or consolequick commands inside the sbt shell. And i do have autoimport and downloadsourcesandjavadocs enabled. To automatically generate scala case classes for your messages add scalapbs sbt plugin to your project. I know if i add withsources when i define one dependency, sbt can download that sources jar file automatically.
Configure and use scala set the scala version used for building the project. Well only write some very basic code, a classic hello world. Continuous delivery for microservices with sbt and docker, scala up north 2016, julien letrouit. The scalaversion configures the version of scala used for compilation.
The most popular way to get scala is either using scala through sbt, the scala. To prevent sbt from running on jdk, install jenv or switch to using sdkman. How to start a scala repl session inside sbt simple build. After years of using and not particularly liking maven for java projects, and with getting by with a simple sbt file for scala work, i now have a more complex scala project and consequently im having to actually learn sbt. I think the caching stuff has been vastly improved during the 0. You want to use eclipse with a project youre managing with sbt. Sbt repository connection issue the scala programming. Its nature to download the dependencies source jars in a sbt project, using sbt genidea or ideas autoimport feature. Download the scala binaries for need help running the binaries. Dec 14, 2016 enter your email address to follow this blog and receive notifications of new posts by email. Sources in srcmainscala or srcmainjava tests in srctestscala or srctestjava data. Certainly i dont have this problem intellij idea 14. Compared to other programming languages, installing scala is a bit unusual. Getting started with sbt for scala introduces sbt and its various features.
March 01, 2016 scala sbt plugins functional programming. Integration for sbt that lets you generate sources for your scalate templates and precompile them as part of the normal compilation process. How to compile, run, and package a scala project with sbt. Enter your email address to follow this blog and receive notifications of new posts by email. If you do not get good answers here, i would probably ask this question again on the scala sbt mailing list. How to download sbt plugin source jars in a common sbt project. This scala version will only be used for the build and not for sbt, which will still use the version it was compiled against. Sign up an example sbt project which uses macros scala 2. Type sbt compile to have the project continually compile when files change. This should not be a normal dependency of the project, so sbt adds a dependency on scala compiler in the special, private scala tool configuration. Both of the above options manage via sbt a specific scala version per. Add withsources to the dependency definition from download sources in the official documentation of sbt downloading source and api documentation jars is usually handled by an ide plugin.
It shows how to set up the build definition for a scala project using sample code to explain different scenarios and use cases. The commands executed in the solution, along with their output, are shown here. Sbt alvin alexander java, scala, unix, perl, mac os x. How do i set the desired scala compiler version in the sbt build. Stages include resolving dependency download and compiling. It is launching the various build stages your app needs rather than compiling directly. How can i let sbt download the source of scalalibrary. After all, one can compile scala sources with maven and gradle, so whats the point of using a new build tool. The initial goals are to enable importing vanilly sbt projects, driving the build process from eclipse and provide an output console. How to package a scala project to a jar file with sbt. This a compiles your scala project and then b starts a repl session.
Testing scala with sbt and scalatest on the command line. See the next section for how to disable this automatic dependency. The first time you run sbt, it may take a while to download all the dependencies it needs, but after that first run, it will download new dependencies only as needed. Getting started with scala and sbt on the command line. Sbt repository connection issue the scala programming language. This site uses cookies to offer you a better browsing experience. The interpreter also called repl, for readevalprint loop is useful for trying out snippets of scala code. Incremental testing and compilation only changed sources are recompiled, only affected tests are rerun etc. You can use several different tools to build your scala projects, including ant, maven, gradle, and more. Improving scala code with sbt by domingo valera march 01, 2016 scala sbt plugins functional programming. Application scala maven pour spark et intellij azure.
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