Subproject dependencies in SBT - scala

Question

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)
}

Answer 1

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")
}
}