How to convert a Scala Array[Byte] to Java byte[]?

Question

I have an Akka application with actors written in Scala and others in Java. In one case a Scala Actor writes an Array[Byte] and I need to deserialize this from a Java Actor. In this use-case I ultimately need a String representation in Java of the Array[Byte] so that would also solve my problem.

Scala Actor:

val outputStream = new java.io.ByteArrayOutputStream()
val bufferedOutputStream = new java.io.BufferedOutputStream(outputStream, 1024)
val exitCode : Integer = processBuilder #> bufferedOutputStream !
bufferedOutputStream.flush
val content = outputStream.toByteArray // this gives an Array[Byte]
javaActorRef.tell(content, getSelf())

Java Actor:

/**
 * {@inheritDoc}
 */
@Override
public void onReceive(Object object) throws Exception {
    // object has a Scala Array[Byte] how do I convert here to 
    // byte[] or to String?

Solution

Scala's Array[Byte] is already a Java's byte[]. Proof:

object ScalaSide extends Application {
  val a = Array[Byte](1, 2, 3)

  JavaSide.doSmth(a)
}

--

import java.util.Arrays;

public class JavaSide {
    public static void doSmth(Object arr) {
        byte[] b = (byte[]) arr;
        System.out.println(Arrays.toString(b));
    }
} 

Result:

[1, 2, 3]

Comments

[mttdbrd]

That's what I thought.

[Bill Woodger]

If you have a problem, which you seem to have from your final two lines, you should ask it as a new question, not post it as an answer. You can include a link to this question if you feel it helps explain your question (use the share link under the question).

[dividebyzero]

It seems you actually need something like Array[Byte](1.toByte, ...) etc because Array[Byte] won't take an Int literal.

[mdornfe1]

But what if the method is void doSmth(byte[] arr) ? What would do to a before passing it to the method?