Eclipse/Kotlin 仅识别一些需要的导入

我按照说明进行操作用于 Eclipse 的 Kotlin 插件 https://kotlinlang.org/docs/tutorials/getting-started-eclipse.html。 Hello World 测试运行良好。然后我做了一个“文件”>“新建”>“Kotlin 文件”。

package so2
object LineParserRegistry {
    val parsers = ConcurrentHashMap<KClass<*>, (String) -> Any?>()
    inline fun <reified T> register(noinline parser : (String) -> T?) {
        parsers[T::class] = parser
    }
    inline fun <reified T> get(): (String) -> T? {
        // force companion initializer
        Class.forName(T::class.java.name)
        return parsers[T::class] as (String) -> T??
    }
}
data class College(val id: String, val name: String) {
    companion object {
        init {
            val collegeLineParser: (String) -> College? = { line ->
                val regex = Regex("(\\d+) (.+)")
                regex.matchEntire(line)?.let {
                    College(it.groupValues[1], it.groupValues[2])
                }
            }
            LineParserRegistry.register(collegeLineParser)
        }
    }
}
inline fun <reified T : Any> File.parseLines(): List<T> =
    useLines { it.mapNotNull(LineParserRegistry.get<T>()).toList() }
fun main(){
    val colleges = File("/home/cwhii/work/input.txt").parseLines<College>()
    println("colleges: $colleges")
    println("OK.")
}

Eclipse 提供添加这些imports我让它这样做：

import java.util.concurrent.ConcurrentHashMap
import kotlin.reflect.KClass
import java.io.File

当我在这里运行它时，结果是：

No Location
    ERROR: Supertypes of the following classes cannot be resolved. Please make sure you have the required dependencies in the classpath:
    class kotlin.text.Regex, unresolved supertypes: java.io.Serializable

/home/cwhii/work/sw/kaptcp/src/so/loadClass.kt
    ERROR: Unresolved reference: File (14, 30)
    ERROR: Unresolved reference: File (18, 17)
/home/cwhii/work/sw/kaptcp/src/so2/hiddenReg.kt
    ERROR: Unresolved reference: java (2, 8)
    ERROR: Unresolved reference: java (4, 8)
    ERROR: Unresolved reference: ConcurrentHashMap (6, 19)
    ERROR: Unresolved reference: Class (12, 9)
    ERROR: Cannot access class 'java.lang.Class'. Check your module classpath for missing or conflicting dependencies (12, 32)
    ERROR: Unresolved reference: name (12, 37)
    ERROR: Unresolved reference: File (29, 30)
    ERROR: Unresolved reference: File (32, 20)

首先这个问题是如何解决的？其次，为什么Eclipse会指出import问题而不是其他问题？

Eclipse > Window > Preferences > Java > Build Path > Classpath Variables

我认为是因为 Eclipse 知道足够多的建议import java.io.File这是在import java.io that java.io.Serializable将位于同一位置，即它存在于系统上以便被发现。如果这不是真的，我在哪里可以找到应该在这里和不应该在这里的东西？

尝试在 eclipse 首选项 -> kotlin -> 编译器上设置 JDK home 选项，它对我有用