This is an excerpt of the spark-daria build.sbt file: libraryDependencies += "" %% "spark-sql" % "2.3.0" % "provided" Spark-daria is a good example of an open source project that is distributed as a thin JAR file. Let’s dig into the gruesome details! Building a Thin JAR FileĪs discussed, the sbt package builds a thin JAR file of your project. If you run sbt assembly, SBT will build a fat JAR file that includes both your project files and the uJson files.
The thin JAR file will not include the uJson files. If you run sbt package, SBT will build a thin JAR file that only includes your project files. Let’s say you add the uJson library to your build.sbt file as a library dependency.
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Fat JAR files inlude all the code from your project and all the code from the dependencies. You can build “fat” JAR files by adding sbt-assembly to your project. Thin JAR files only include the project’s classes / objects / traits and don’t include any of the project dependencies. You can build a “thin” JAR file with the sbt package command. JAR files can be attached to Databricks clusters or launched via spark-submit. Hopefully it will help you make the leap and start writing Spark code in SBT projects with a powerful IDE by your side! JAR File BasicsĪ JAR (Java ARchive) is a package file format typically used to aggregate many Java class files and associated metadata and resources (text, images, etc.) into one file for distribution.
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This episode will demonstrate how to build JAR files with the SBT package and assembly commands and how to customize the code that’s included in JAR files. Scala is a difficult language and it’s especially challenging when you can’t leverage the development tools provided by an IDE like IntelliJ. Your launcher class just needs to look like this (will need to convert that from kotlin to java): package com.Spark JAR files let you package a project into a single file so it can be run on a Spark cluster.Ī lot of developers develop Spark code in brower based notebooks because they’re unfamiliar with JAR files. Then just execute gradle jar and the jar will be in build/libs You also might need to add a few more javafx modules depending on what you are doing.
My app uses Kotlin so just remove the kotlin stuff, you will also need to change the mainClassName to your main class and the manifest attribute should point to your Launcher. If you are using a new version of java there is a tool called jpackage available that can create clickable jar files with a bundled runtime.ĮDIT: Here is a working adle that creates a clickable jar for a JavaFX app that uses fxml files: you will need to change a few things. The organization of that getting started doc makes everything appear much harder than it actually is. If you want to use maven (I would recommend gradle t hough) there are analogous pom.xml's available in those sample projects. You will need that launcher class that is in the project that adle is in ( ) You will of course need to change class names in the adle to match yours. You would just execute: gradle jar at the command-line. If you just want a clickable jar here is a adle for that: If you want a bundled runtime, this doc shows how to create one with whichever combo of build tool and modular/non-modular you are using: Do you also want to bundle a runtime? Or is just a double-clickable jar file, with the assumption the user will have a runtime already installed, good enough? Are you using a build tool? If so which one? Gradle? Maven?
This actually kind of depends on which version of Java you have.