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scala> implicit def toJavaList[A](t:collection.Sequence[A]):java.util.List[A] =
| java.util.Arrays.asList(t.toArray:_*)
toJavaList: [A](t: Sequence[A])java.util.List[A]
scala> val x: java.util.List[String] = List("foo")
<console>:7: error: type mismatch;
found : List[Any]
required: java.util.List[String]
val x: java.util.List[String] = List("foo")
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