SBT中的子项目依赖关系 [英] Subproject dependencies in SBT

问题描述

我有一个奇怪的问题，SBT子项目，我认为是依赖关联。这是我的设置：

• 我有一个具有两个子项目A和B的SBT项目。


• A包含一个类和伴侣对象 MyA


• B取决于A。


• B包含对象 MyB 其主要方法。

当我尝试执行 MyB 从SBT提示符，我得到一个 NoSuchMethodError 在 MyA 。这不是一个 ClassNotFoundException ，可能是因为它在类路径上看到 MyA 类，而不是 MyA 对象。

作为一个健全检查，我删除了B子项目，并将其源代码移动到A源代码树中。当我从SBT提示符下运行 MyB 时，它将按预期运行。

有人遇到这个，还是我做的事情显然是错的？

这是我的项目配置：

  class MyProject（info：ProjectInfo）extends ParentProject（info）{
 
 lazy val a = project（a，a，new AProject（_））
 lazy val b =项目（b，b，新的BProject（_），a）
 
对象依赖关系{
 lazy val scalaTest =org.scalatest％scalatest_2.9.0％ 1.4.1％测试
} 
 
 class AProject（info：ProjectInfo）使用AutoCompilerPlugins扩展DefaultProject（info）{
 val scalaTest = Dependencies.scalaTest 
 val connectationsPlugin = compilerPlugin（org.scala-lang.plugins％continuation％2.9.0）
 override def compileOptions = super.compileOptions ++ compileOptions（ -  P：继续：启用）+ + compileOptions（ -  unchecked）
} 
 
 class BProject（info：ProjectInfo）exte nds DefaultProject（info）
 
} 
  

解决方案

  class MyProject （info：ProjectInfo）extends ParentProject（info）{
 
 lazy val a = project（a，a，new AProject（_））
 lazy val b = project b，b，新的BProject（_），a）
 
对象依赖关系{
 lazy val scalaTest =org.scalatest％scalatest_2.9.0％1.4.1 ％test
} 
 
 class AProject（info：ProjectInfo）使用AutoCompilerPlugins扩展DefaultProject（info）{
 val scalaTest = Dependencies.scalaTest 
 val continuementsPlugin =编译器插件（org.scala-lang.plugins％连续％2.9.0）
 override def compileOptions = super.compileOptions ++ compileOptions（ -  P：继续：启用）++ compileOptions -unchecked）
} 
 
 class BProject（info： ProjectInfo）使用AutoCompilerPlugins扩展了DefaultProject（info）{
 override def compileOptions = super.compileOptions ++ compileOptions（ -  P：继续：启用）++ compileOptions（ -  unchecked）
} 
 
} 
  

I am having a strange problem with SBT subprojects which I think is dependency related. Here's my setup:

• I have an SBT project with two subprojects A and B.
• A contains a class and companion object MyA
• B depends on A.
• B contains an object MyB which has a main method.

When I try to execute MyB from the SBT prompt, I get a NoSuchMethodError on MyA. This is not a ClassNotFoundException, but maybe it's happening because it sees the MyA class on the classpath, but not the MyA object.

As a sanity check, I dropped the B subproject and moved its source into the A source tree. When I run MyB from the SBT prompt, it works as expected.

Has anyone run into this, or am I doing something obviously wrong?

Here is my project configuration:

class MyProject(info: ProjectInfo) extends ParentProject(info) {

  lazy val a = project("a", "a", new AProject(_))
  lazy val b = project("b", "b", new BProject(_), a)

  object Dependencies {
    lazy val scalaTest = "org.scalatest" % "scalatest_2.9.0" % "1.4.1" % "test"
  }

  class AProject(info: ProjectInfo) extends DefaultProject(info) with AutoCompilerPlugins {
    val scalaTest = Dependencies.scalaTest
    val continuationsPlugin = compilerPlugin("org.scala-lang.plugins" % "continuations" % "2.9.0")
    override def compileOptions = super.compileOptions ++ compileOptions("-P:continuations:enable") ++ compileOptions("-unchecked")
  }

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

}

解决方案

It turns out to have been a problem enabling the continuations plugin on project B. Here's my working configuration:

class MyProject(info: ProjectInfo) extends ParentProject(info) {

  lazy val a = project("a", "a", new AProject(_))
  lazy val b = project("b", "b", new BProject(_), a)

  object Dependencies {
    lazy val scalaTest = "org.scalatest" % "scalatest_2.9.0" % "1.4.1" % "test"
  }

  class AProject(info: ProjectInfo) extends DefaultProject(info) with AutoCompilerPlugins {
    val scalaTest = Dependencies.scalaTest
    val continuationsPlugin = compilerPlugin("org.scala-lang.plugins" % "continuations" % "2.9.0")
    override def compileOptions = super.compileOptions ++ compileOptions("-P:continuations:enable") ++ compileOptions("-unchecked")
  }

  class BProject(info: ProjectInfo) extends DefaultProject(info) with AutoCompilerPlugins {
    override def compileOptions = super.compileOptions ++ compileOptions("-P:continuations:enable") ++ compileOptions("-unchecked")
  }

}

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