转换不推荐的SBT构建文件

Question

i具有此build.sbt文件，而使用的语法(＆lt;＆lt; =(现在已弃用。如何更改文件以使其再次工作？我知道有一个页面记录了更改，但我无法正确理解它。

libraryDependencies <<= scalaVersion {
    scala_version => Seq(
          ("org.apache.spark" % "spark-core_2.10" % "1.2.0").
          exclude("org.eclipse.jetty.orbit", "javax.mail.glassfish").
          exclude("org.eclipse.jetty.orbit", "javax.activation").
          exclude("com.esotericsoftware.kryo", "minlog").
          exclude("com.esotericsoftware.minlog", "minlog").
         exclude("commons-beanutils", "commons-beanutils").
          exclude("commons-beanutils", "commons-beanutils-core").
          exclude("commons-logging", "commons-logging").
          exclude("org.slf4j", "jcl-over-slf4j").
          exclude("org.apache.hadoop", "hadoop-yarn-common").
          exclude("org.apache.hadoop", "hadoop-yarn-api").
          exclude("org.eclipse.jetty.orbit", "javax.transaction").
          exclude("org.eclipse.jetty.orbit", "javax.servlet"),
          ("org.apache.spark" %% "spark-graphx" % "1.2.0").
          exclude("org.eclipse.jetty.orbit", "javax.mail.glassfish").
          exclude("org.eclipse.jetty.orbit", "javax.activation").
          exclude("com.esotericsoftware.kryo", "minlog").
          exclude("com.esotericsoftware.minlog", "minlog").
         exclude("commons-beanutils", "commons-beanutils").
          exclude("commons-beanutils", "commons-beanutils-core").
          exclude("commons-logging", "commons-logging").
          exclude("org.slf4j", "jcl-over-slf4j").
          exclude("org.apache.hadoop", "hadoop-yarn-common").
          exclude("org.apache.hadoop", "hadoop-yarn-api").
          exclude("org.eclipse.jetty.orbit", "javax.transaction").
          exclude("org.eclipse.jetty.orbit", "javax.servlet")
        )
}

Answer 1

查看与SBT的警告相关的迁移指南：

[info] Loading global plugins from /.sbt/0.13/plugins
//tmp/build.sbt:3: warning: `<<=` operator is deprecated. Use `key := { x.value }` or `key ~= (old => { newValue })`.
See http://www.scala-sbt.org/0.13/docs/Migrating-from-sbt-012x.html
libraryDependencies <<= scalaVersion {

您可以看到您属于此处的最佳情况：

带有简单的表达式，例如：

a <<= aTaskDef
b <+= bTaskDef
c <++= cTaskDefs

足以用等效替换它们：

a := aTaskDef.value
b += bTaskDef.value
c ++= cTaskDefs.value

所以您的aTaskDef是{}

之间的一部分

因此，您可以解决您的问题：

scalaVersion := "2.11.7"
libraryDependencies := scalaVersion {
    scala_version => Seq(
          ("org.apache.spark" % "spark-core_2.10" % "1.2.0").
          exclude("org.eclipse.jetty.orbit", "javax.mail.glassfish").
          exclude("org.eclipse.jetty.orbit", "javax.activation").
          exclude("com.esotericsoftware.kryo", "minlog").
          exclude("com.esotericsoftware.minlog", "minlog").
         exclude("commons-beanutils", "commons-beanutils").
          exclude("commons-beanutils", "commons-beanutils-core").
          exclude("commons-logging", "commons-logging").
          exclude("org.slf4j", "jcl-over-slf4j").
          exclude("org.apache.hadoop", "hadoop-yarn-common").
          exclude("org.apache.hadoop", "hadoop-yarn-api").
          exclude("org.eclipse.jetty.orbit", "javax.transaction").
          exclude("org.eclipse.jetty.orbit", "javax.servlet"),
          ("org.apache.spark" %% "spark-graphx" % "1.2.0").
          exclude("org.eclipse.jetty.orbit", "javax.mail.glassfish").
          exclude("org.eclipse.jetty.orbit", "javax.activation").
          exclude("com.esotericsoftware.kryo", "minlog").
          exclude("com.esotericsoftware.minlog", "minlog").
         exclude("commons-beanutils", "commons-beanutils").
          exclude("commons-beanutils", "commons-beanutils-core").
          exclude("commons-logging", "commons-logging").
          exclude("org.slf4j", "jcl-over-slf4j").
          exclude("org.apache.hadoop", "hadoop-yarn-common").
          exclude("org.apache.hadoop", "hadoop-yarn-api").
          exclude("org.eclipse.jetty.orbit", "javax.transaction").
          exclude("org.eclipse.jetty.orbit", "javax.servlet")
        )
}.value

您在问题中说明：

，但我无法正确理解它。

您到底不了解什么？如果您可以详细说明，如果我可能能够告诉您更多有关此事的人，它可能会帮助任何面临类似问题的人。