Scala SBT：独立 jar

Scala SBT: standalone jar

提问by dsg

The answer: Making stand-alone jar with Simple Build Toolseems like what I need, but it did not have enough information for me, so this is a followup.

答案：使用 Simple Build Tool 制作独立 jar似乎是我需要的，但它没有足够的信息给我，所以这是一个后续。

(1) How do I adapt the answer to my need? I don't understand what would need to be changed.

(1) 我如何根据我的需要调整答案？我不明白需要改变什么。

(2) What command do I run to create the standalone jar?

(2) 我运行什么命令来创建独立的 jar？

(3) Where can I find the jar after it has been created?

(3) jar 被创建后在哪里可以找到它？

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What I've tried:

我试过的：

• Pasting the code in the linked answer verbatim into my: project/build/dsg.scalafile. The file now has a

  class ForkRun(info: ProjectInfo) extends DefaultProject(info)

  (from before, used for running projects in a separate VM from SBT) and the new:

  trait AssemblyProject extends BasicScalaProject

  from the linked answer.

• I also tried pasting the body (all defsand the lazy valof the AssemblyProjectinto the body of ForkRun.

• 将链接答案中的代码逐字粘贴到我的：project/build/dsg.scala文件中。该文件现在有一个

  class ForkRun(info: ProjectInfo) extends DefaultProject(info)

  （以前用于在与 SBT 不同的 VM 中运行项目）和新的：

  trait AssemblyProject extends BasicScalaProject

  从链接的答案。

• 我也试过粘贴体（所有defs和lazy val的AssemblyProject成体ForkRun。

To create a jarI ran packageat the SBT prompt and get:

要创建一个jar我package在 SBT 提示符下运行并得到：

[info] Packaging ./target/scala_2.8.1/dsg_2.8.1-1.0.jar ...
[info] Packaging complete.

So I tried running the dsg_2.8.1-1.0.jarfrom the shell via:

所以我尝试dsg_2.8.1-1.0.jar通过以下方式从 shell运行：

java -jar dsg_2.8.1-1.0.jar 

But I get:

但我得到：

Failed to load Main-Class manifest attribute from
dsg_2.8.1-1.0.jar

Could this be caused by having multiple entry points into my project? I select from a list when I execute runfrom the SBT prompt. Perhaps I need to specify the default when creating the package?

这可能是因为我的项目有多个入口点吗？当我run从 SBT 提示执行时，我从列表中进行选择。也许我需要在创建包时指定默认值？

采纳答案by Janx

Here's a writeup I did on one way to make an executable jar with SBT:

这是我用 SBT 制作可执行 jar 的一种方法的一篇文章：

http://janxspirit.blogspot.com/2011/01/create-executable-scala-jar-with-sbt.html

http://janxspirit.blogspot.com/2011/01/create-executable-scala-jar-with-sbt.html

回答by prabeesh

sbt-assemblyis a sbt plugin to create a standalone jar of Scala sbt project with all of its dependencies.

sbt-assembly是一个 sbt 插件，用于创建 Scala sbt 项目的独立 jar 及其所有依赖项。

Refer this postfor more details with an example.

有关示例的更多详细信息，请参阅此帖子。