get java object array from scala list

Question

I'm working with apache reflection, and there is a java method whose signature is

public static Object invokeStaticMethod(Class cls, String methodName,
  Object[] args)

And my code is

object Tobject {
  def echo(name: String) =
    println("echo 1")

  def echo2(name: String, arg: String) =
    println ("echo 2")
}



class ApacheReflection extends FunSuite {

  test("apache reflection") {
    val factory = ClassUtils.getClass("Tobject")

    MethodUtils.invokeStaticMethod(factory,"echo2", List("sf", "f").asJava)

  }

}

And I got exception message

No such accessible method: echo2() on class: Tobject
java.lang.NoSuchMethodException: No such accessible method: echo2() on class: Tobject

it seems that asJava can convert scala list to java list but not array, so how can I get java array from scala list?

AFAIK, scala use Array from java. So just convert list.toArray and this is enough. — Zernike
– Zernike, Commented Jul 19, 2015 at 12:14
I do know that. But list.toArray is not working. The thing is that invokeStaticMethod has two overload methods. the first one has object as argument and the second one has object[] as argument. No matter what argument I give to it, it just regard my argument as object. — vincent chou
– vincent chou, Commented Jul 19, 2015 at 15:39

krcz · Accepted Answer · 2015-07-20 15:13:36Z

3

Idea to use .toArray is a good try. But it gives Array[String] (= String[] in Java), which is not the same as Array[Object] (= Object[]) for Java. On the other hand, if you use

List("sf", "f").toArray[Object]

everything works.

answered Jul 20, 2015 at 15:13

krcz

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