Convert Java Array to Scala WrappedArray (In JAVA)

Question

I'm writing a Java Spark application and I'm trying to write a unit test for one of my UDFs. This UDF accept Array of String and return Long:

protected UDF1<WrappedArray<String>, Long> convertMyArray() {
    return (WrappedArray<String> s) -> {
        
        return ...;
    };
}

When I test it with a Spark session, the logic works fine. my problem is how can I unittest this logic.

 @Test
    public void arrayConversion() throws Exception {
        ArrayList<String> inputName = new ArrayList<String>() {
            {
                add("Inp1");
                add("Inp2");
            }
        };

        assertEquals(5, myUDF.convertMyArray().call(...);
        
    }

How can I convert inputName into wappedArray. I can not just simply pass inputName into my UDF call because of input mismatch.

I have also tried to use make based on WrappedArray.scala::Make

WrappedArray<String> stringInput = WrappedArray.make(inputName);

But I still get run time error:

scala.MatchError: [Inp1, Inp2] when using make

The companion object in WrappedArray.scala has a make method. Is that method showing up in your setup? — aksappy
– aksappy, Commented Aug 3, 2021 at 17:09
@aksappy I am getting scala.MatchError: [Inp1, Inp2] when using make — Am1rr3zA
– Am1rr3zA, Commented Aug 3, 2021 at 19:25

Levi Ramsey · Accepted Answer · 2021-08-03 23:11:26Z

4

You are constructing a Java ArrayList, which isn't an array but a Java collection.

You can convert it to a WrappedArray with

WrappedArray<String> stringInput = WrappedArray.make(inputName.toArray(new String[0]))

answered Aug 3, 2021 at 23:11

Levi Ramsey

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