如何在sbt项目中声明对Scalding的依赖？

时间：2014-07-14 12:47:45

标签： eclipse scala sbt scalding

我正在尝试弄清楚如何为我自己的基于Scalding的项目创建build.sbt文件。

烫染源结构没有build.sbt个文件。相反，它具有project/Build.scala构建定义。

将我自己的sbt项目与Scalding集成的正确方法是什么，所以我也可以稍后在Eclipse中使用sbt-eclipse插件导入它？

更新

以下代码：

import cascading.tuple.Fields
import com.twitter.scalding._

class Scan(args: Args) extends Job(args) {
  val output = TextLine("tmp/out.txt")

  val wordsList = List(
    ("john"),
    ("liza"),
    ("nina"),
    ("x"))

  val orderedPipe =
    IterableSource[(String)](wordsList, ('word))
      .debug
      .write(output)
}

使用此build.sbt：

name := "Scan"

version := "1.0"

libraryDependencies := Seq("com.twitter" %% "scalding" % "0.11.1")

我收到错误：

$ sbt
[info] Loading global plugins from /home/test/.sbt/0.13/plugins
[info] Set current project to Scan (in build file:/home/test/Cascading/Scala/Scan/)
> compile
[info] Updating {file:/home/test/Cascading/Scala/Scan/}scan...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] downloading http://repo1.maven.org/maven2/com/twitter/scalding_2.10/0.11.1/scalding_2.10-0.11.1.jar ...
[info]  [SUCCESSFUL ] com.twitter#scalding_2.10;0.11.1!scalding_2.10.jar (641ms)
[info] Done updating.
[info] Compiling 1 Scala source to /home/test/Cascading/Scala/Scan/target/scala-2.10/classes...
[error] /home/test/Cascading/Scala/Scan/src/main/scala/Scan.scala:1: not found: object cascading
[error] import cascading.tuple.Fields
[error]        ^
[error] /home/test/Cascading/Scala/Scan/src/main/scala/Scan.scala:2: object twitter is not a member of package com
[error] import com.twitter.scalding._
[error]            ^
[error] /home/test/Cascading/Scala/Scan/src/main/scala/Scan.scala:5: not found: type Job
[error] class Scan(args: Args) extends Job(args) {
[error]                                ^
[error] /home/test/Cascading/Scala/Scan/src/main/scala/Scan.scala:5: not found: type Args
[error] class Scan(args: Args) extends Job(args) {
[error]                  ^
[error] /home/test/Cascading/Scala/Scan/src/main/scala/Scan.scala:5: too many arguments for constructor Object: ()Object
[error] class Scan(args: Args) extends Job(args) {
[error]           ^
[error] /home/test/Cascading/Scala/Scan/src/main/scala/Scan.scala:6: not found: value TextLine
[error]   val output = TextLine("tmp/out.txt")
[error]                ^
[error] /home/test/Cascading/Scala/Scan/src/main/scala/Scan.scala:15: not found: value IterableSource
[error]     IterableSource[(String)](wordsList, ('word))
[error]     ^
[error] 7 errors found
[error] (compile:compile) Compilation failed

更新2

执行git clone git@github.com:twitter/scalding.git their repository和sbt publishLocal后，我仍然遇到相同的编译错误。

但是你建议build.sbt添加两行允许我编译我的代码。所以以下build.sbt确实有效，谢谢！

name := "BlockScan"

version := "1.0"

libraryDependencies := Seq("com.twitter" %% "scalding" % "0.11.1")

lazy val scaldingCore = ProjectRef(uri("https://github.com/twitter/scalding.git"), "scalding-core")

lazy val myProject = project in file(".") dependsOn scaldingCore

＆＃39; sbt eclipse＆＃39;创建Eclipse项目，它不在Eclipse下编译并报告这些错误：

Project 'Scan' is missing required Java project: 'scalding-core'
More than one scala library found in the build path (/home/test/usr/eclipse-scala-3.0.3/configuration/org.eclipse.osgi/bundles/290/1/.cp/lib/scala-library.jar, /home/test/wks/Cascading/Scala/scalding/target/scala-2.9.3/scalding-assembly-0.10.0.jar).At least one has an incompatible version. Please update the project build path so it contains only compatible scala libraries. 

scalacheck_2.9.3-1.10.0.jar is cross-compiled with an incompatible version of Scala (2.9.3). 

specs_2.9.3-1.6.9.jar is cross-compiled with an incompatible version of Scala (2.9.3).

1 个答案:

答案 0 :(得分：5)

由于他们似乎没有将他们的库发布到可以提取必要依赖关系的远程存储库，因此您必须在项目的GitHub存储库中声明源依赖关系。

lazy val scaldingCore = ProjectRef(uri("https://github.com/twitter/scalding.git"), "scalding-core")

lazy val myProject = project in file(".") dependsOn scaldingCore

使用上面的构建定义，sbt将git clone RootProject并加载构建。

➜  scalding  xsbt
[info] Loading global plugins from /Users/jacek/.sbt/0.13/plugins
Cloning into '/Users/jacek/.sbt/0.13/staging/e1da2accb95841ffb1df/scalding'...
[info] Loading project definition from /Users/jacek/.sbt/0.13/staging/e1da2accb95841ffb1df/scalding/project
[info] Updating {file:/Users/jacek/.sbt/0.13/staging/e1da2accb95841ffb1df/scalding/project/}scalding-build...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] downloading http://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.eed3si9n/sbt-assembly/scala_2.10/sbt_0.13/0.10.2/jars/sbt-assembly.jar ...
[info]  [SUCCESSFUL ] com.eed3si9n#sbt-assembly;0.10.2!sbt-assembly.jar (3600ms)
[info] Done updating.
[info] Compiling 3 Scala sources to /Users/jacek/.sbt/0.13/staging/e1da2accb95841ffb1df/scalding/project/target/scala-2.10/sbt-0.13/classes...
[warn] there were 8 deprecation warning(s); re-run with -deprecation for details
[warn] there were 2 feature warning(s); re-run with -feature for details
[warn] two warnings found
[info] Set current project to myProject (in build file:/Users/jacek/sandbox/scalding/)
> projects
[info] In file:/Users/jacek/sandbox/scalding/
[info]   * myProject
[info] In https://github.com/twitter/scalding.git
[info]     maple
[info]     scalding
[info]     scalding-args
[info]     scalding-avro
[info]     scalding-commons
[info]     scalding-core
[info]     scalding-date
[info]     scalding-hadoop-test
[info]     scalding-jdbc
[info]     scalding-json
[info]     scalding-parquet
[info]     scalding-repl

构建设置应该允许您访问烫伤类。

> console
[info] Starting scala interpreter...
[info]
Welcome to Scala version 2.10.4 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_60).
Type in expressions to have them evaluated.
Type :help for more information.

scala> import com.twitter.scalding._
import com.twitter.scalding._

Scan类编译得很好 - 它位于src/main/scala目录中。

> show sources
[info] ArrayBuffer(/Users/jacek/sandbox/scalding/src/main/scala/Scan.scala)
[success] Total time: 0 s, completed Jul 15, 2014 12:21:14 AM
> compile
[info] Updating {file:/Users/jacek/sandbox/scalding/}myProject...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] Done updating.
[info] Compiling 1 Scala source to /Users/jacek/sandbox/scalding/target/scala-2.10/classes...
[success] Total time: 4 s, completed Jul 15, 2014 12:21:20 AM

你也可以git clone git@github.com:twitter/scalding.git他们的存储库和sbt publishLocal能够在build.sbt中声明二进制依赖，如下所示：

libraryDependencies := Seq("com.twitter" %% "scalding" % "0.11.1")

依赖于（无论哪种方式），执行sbt eclipse并完成它！

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