Using Scala array from java

Question

I'm trying to use some library code written in scala from a java program. I have a function that returns an Array (a scala Array) and I thought it would be possible to do

Tree[] = ScalaObject.myScalaFunction()

But the I get this error :

[error] found   : scala.runtime.BoxedArray
[error] required: org.grammaticalframework.Trees.Absyn.Tree[]

What is the correct way to use a scala array in java ?

Do you use scala 2.7? In scala2.8, a scala Array is equals to a java Array. — Eastsun
– Eastsun, Commented Jun 3, 2010 at 13:22
Assuming that myScalaFunction() is really returning an array of Trees, have you just tried casting the returned value appropriately? — Trevor Tippins
– Trevor Tippins, Commented Jun 3, 2010 at 13:23
The function is actually a call to toArray from a scala.List (toArray[B >: A] : Array[B]) I'm using scala 2.7.7 Casting doesn't work. — Grégoire
– Grégoire, Commented Jun 3, 2010 at 13:33

Rex Kerr · Accepted Answer · 2010-06-03 13:42:29Z

10

With 2.7, you should be able to

Tree[] t = (Tree)ScalaObject.myScalaFunction().unbox(Tree.class);

in Java.

With 2.8, it will work as you hoped it would.

answered Jun 3, 2010 at 13:42

Rex Kerr

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