AllClassesForPackage.scala

import java.io.File

// quick semi-autotranslation from a Java snippet on SO
// get all classes with a package prefix
  def getClasses(packageName: String): List[Class[_]] = {
    val classLoader = Thread.currentThread.getContextClassLoader
    assert(classLoader != null)
    val path = packageName.replace('.', '/')
    val resources = classLoader.getResources(path)
    var dirs = List.empty[File]
    while (resources.hasMoreElements) {
      val resource = resources.nextElement
      dirs ::= new File(resource.getFile)
    }
    var classes = List.empty[Class[_]]
    for (directory <- dirs) {
      classes :::= findClasses(directory, packageName)
    }
    classes
  }

  private def findClasses(directory: File, packageName: String): List[Class[_]] = {
    if (!directory.exists) return Nil
    var classes = List.empty[Class[_]]
    val files = directory.listFiles
    for (file <- files) {
      if (file.isDirectory) {
        assert(!file.getName.contains("."))
        classes :::= findClasses(file, packageName + "." + file.getName)
      }
      else if (file.getName.endsWith(".class")) {
        classes ::= Class.forName(packageName + '.' + file.getName.substring(0, file.getName.length - 6))
      }
    }
    classes
  }