scala宏创建java bean类时出现未知类型错误

object Macros {
  def encode[A <: Product,B](value:A):B = macro MacrosImpl.encode_impl[A,B]
}

class MacrosImpl(val c:Context) {
  import c.universe._
  def encode_impl[ScalaType: c.WeakTypeTag,JavaType: c.WeakTypeTag](value:c.Expr[ScalaType]) = {

    val scalaType: WeakTypeTag[ScalaType] = implicitly[WeakTypeTag[ScalaType]]

    val fields = scalaType.tpe.typeSymbol.companion.typeSignature.members.collectFirst {
      case method if method.name.toString == "apply" => method
    }.toList.flatMap(_.asMethod.paramLists.flatten).
      map{
      case s if s.name.toString == "id" => q"underlying.setId($value.$s.orNull)"
      case s => q"underlying.${c.universe.newTermName("set" + s.name.toString.capitalize) }($value.$s)"
    }

    val javaType: WeakTypeTag[JavaType] = implicitly[WeakTypeTag[JavaType]]

    q"""
       val underlying = new ${javaType.tpe}()
       ..$fields
       underlying
       """
  }
}

这个编译在宏项目编译时很好,当我尝试使用它.它在使用库项目编译时抛出异常.

private val x: IpDataEntry = IpDataEntry(None,"a","a")
println(Macros.encode[IpDataEntry,Underlying](x)) //not comp


[error] Unknown type: <error>,<error> [class scala.reflect.internal.Types$ErrorType$,class scala.reflect.internal.Types$ErrorType$] TypeRef? false
[trace] Stack trace suppressed: run 'last web/compile:compile' for the full output.
[error] (web/compile:compile) scala.reflect.internal.FatalError: Unknown type: <error>,class scala.reflect.internal.Types$ErrorType$] TypeRef? false
[error] Total time: 12 s,completed Jun 19,2014 11:53:42 AM

我被困在这里,我的代码中找不到任何错误.

Scala版本是2.11.1.