使用 Akka 构建 sbt 需要什么？

Question

我正在尝试使用scala -akka from sbt.

我的sbt文件如下:

name := "hello"
version := "1.0"
scalaVersion := "2.9.1"
resolvers += "akka" at "http://repo.akka.io/snapshots"
libraryDependencies ++= Seq(
  "com.codahale"      % "simplespec_2.9.0-1" % "0.4.1",
  "com.typesafe.akka" % "akka-stm"           % "2.0-SNAPSHOT" 
)

我代码:

import akka._
object HelloWorld {
  def main(args: Array[String]) {
    println("Hello, world!")
  }
}

当我做sbt compile时，我得到

]# **sbt compile**
[info] Set current project to default-91c48b (in build file:/var/storage1/home/test_user/dev_scala/hello/)
[info] Compiling 1 Scala source to /var/storage1/home/test_user/dev_scala/hello/target/scala-2.9.2/classes...
[error] /var/storage1/home/test_user/dev_scala/hello/src/main/scala/hw.scala:3: not found: object akka
[error] import akka._
[error]        ^
[error] one error found
[error] (compile:compile) Compilation failed
[error] Total time: 3 s, completed May 22, 2013 8:59:08 PM

请建议。

EDIT2:根据下面的评论。这是新的SBT文件

name := "hello"
version := "1.0"
scalaVersion := "2.9.1"
resolvers += "akka" at "http://repo.akka.io/snapshots"
libraryDependencies ++= Seq(
"com.typesafe.akka" %% "akka-actor" % "2.1.4",
  "com.codahale" % "simplespec_2.9.0-1" % "0.4.1",
  "com.typesafe.akka" % "akka-stm" % "2.0-SNAPSHOT" ,
  "com.typesafe.akka" %% "akka-actor"    % "2.2-M3",
"com.typesafe.akka" %% "akka-slf4j"    % "2.2-M3",
"com.typesafe.akka" %% "akka-remote"   % "2.2-M3",
"com.typesafe.akka" %% "akka-testkit"  % "2.2-M3"% "test"
)

有什么想法吗?

Answer 1

您的项目没有正确的依赖项。

你要加上这个"com.typesafe.akka" %% "akka-actor" % "2.0.5"。这是akka核心模块的主要依赖项。此外，最好为您的akka项目添加以下内容:

"com.typesafe.akka" %% "akka-actor"    % "2.0.5",
"com.typesafe.akka" %% "akka-slf4j"    % "2.0.5",
"com.typesafe.akka" %% "akka-remote"   % "2.0.5",
"com.typesafe.akka" %% "akka-agent"    % "2.0.5", 
"com.typesafe.akka" %% "akka-testkit"  % "2.0.5"% "test"

要使用actor，你应该导入akka.actor._

好的，这个构建文件为我工作

name := "hello"
version := "1.0"
scalaVersion := "2.10.1"
libraryDependencies ++= Seq(
  "com.typesafe.akka" %% "akka-actor"   % "2.2-M3",
  "com.typesafe.akka" %% "akka-slf4j"   % "2.2-M3",
  "com.typesafe.akka" %% "akka-remote"  % "2.2-M3",
  "com.typesafe.akka" %% "akka-agent"   % "2.2-M3",
  "com.typesafe.akka" %% "akka-testkit" % "2.2-M3" % "test"
)

不要忘记reload和update您的项目在sbt

Answer 2

你的akka-actor依赖绝对不能和你的其他依赖不同。你添加的任何依赖绝对不能依赖于不同版本的akka，否则你会有一个非常混乱的依赖树。

如果你刚开始使用，最好使用当前版本。在撰写本文时，Coltrane 2.2-M3是当前的。

你可以根据需要添加更多的akka库…但这是基于我们在prod:

中运行的实际项目的基本起点。

name := "app"
organization := "com.yourorg"
version := "0.0.1-SNAPSHOT"
scalaVersion := "2.10.1"
scalacOptions ++= Seq("-unchecked", "-deprecation")
resolvers ++= Seq(
    "Typesafe Repository" at "http://repo.typesafe.com/typesafe/releases/"
)

libraryDependencies ++= Seq(
  "com.typesafe.akka" %% "akka-actor" % "2.2-M3",
  "com.typesafe.akka" %% "akka-slf4j" % "2.2-M3",
  "com.typesafe.akka" %% "akka-testkit" % "2.2-M3"
)

Answer 3

更新24.03.2019

要使用Akka Actors，您需要以下依赖项:

sbt

:

libraryDependencies ++= Seq(
  "com.typesafe.akka" %% "akka-actor" % "2.5.21",
  "com.typesafe.akka" %% "akka-testkit" % "2.5.21" % Test
)

Gradle

:

dependencies {
  compile group: 'com.typesafe.akka', name: 'akka-actor_2.12', version: '2.5.21'
  testCompile group: 'com.typesafe.akka', name: 'akka-testkit_2.12', version: '2.5.21'
}

Maven的

:

<dependency>
  <groupId>com.typesafe.akka</groupId>
  <artifactId>akka-actor_2.12</artifactId>
  <version>2.5.21</version>
</dependency>
<dependency>
  <groupId>com.typesafe.akka</groupId>
  <artifactId>akka-testkit_2.12</artifactId>
  <version>2.5.21</version>
  <scope>test</scope>
</dependency>

有关Akka集群，Akka流，Akka Http, Alpakka等的更多信息和依赖代码片段，请查看:https://akka.io/docs/