问题描述
我正在试图找出如何为自己创建一个 build.sbt 文件的项目。
I am trying to figure out how to create an build.sbt file for my own Scalding-based project.
结垢源结构没有 build.sbt 文件。相反，它有 project / Build.scala 构建定义。
Scalding source structure has no build.sbt file. Instead it has project/Build.scala build definition.
将自己的sbt整合到什么方法项目与Scalding，所以我也可以导入它以后在Eclipse与 sbt-eclipse 插件？
What would be the right way to integrate my own sbt project with Scalding, so I could also import it later in Eclipse with sbt-eclipse plugin?
更新：
对于以下代码：
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)
}
使用这个 build.sbt ：
With this 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 [email protected]：twitter / scalding.git他们的存储库和 sbt publishLocal 我仍然有相同的编译错误。
After doing git clone [email protected]:twitter/scalding.git their repository and sbt publishLocal I still have the same compilation errors.
但是添加两条你建议的行 build.sbt 允许我编译我的代码。所以以下 build.sbt 真的有效，谢谢！
BUT adding two lines that you suggested to build.sbt allowed me to compile my code. So the following build.sbt really works, thanks!
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
'sbt eclipse'创建Eclipse项目，不编译Eclipse并报告这些错误：
'sbt eclipse' creates Eclipse project wich does not compile under Eclipse and reports these errors:
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).
推荐答案
由于他们似乎没有将他们的库发布远程存储库，您可以在此下拉所需的依赖关系，您必须声明该项目的GitHub存储库的源依赖。
Since they don't seem to publish their libraries to remote repositories where you could pull down the necessary dependencies, you'll have to declare the source dependency on the GitHub repository for the project.
lazy val scaldingCore = ProjectRef(uri("https://github.com/twitter/scalding.git"), "scalding-core")
lazy val myProject = project in file(".") dependsOn scaldingCore
使用上述构建定义，sbt将 git clone RootProject 并加载构建。
With the above build definition, sbt will git clone the RootProject and load the build.
➜ 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
应该允许您进入烫伤课程。
The build setup should give you access to scalding classes.
> 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 class compile fine - 它在 src / main / scala 目录中。
And the Scan class compiles fine - it's in src/main/scala directory.
> 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
您还可以 git clone [email protected] ：twitter / scalding.git 他们的存储库和 sbt publishLocal 能够在中声明二进制依赖关系build.sbt 如下：
You could also git clone [email protected]:twitter/scalding.git their repository and sbt publishLocal to be able to declare binary dependency in build.sbt as follows:
libraryDependencies := Seq("com.twitter" %% "scalding" % "0.11.1")
使用（以任一方式）依赖，执行 sbt eclipse 并完成它！
With the dependency in (either way), execute sbt eclipse and be done with it!
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