sysout

data.class class [B
data [0, 1, 2, 3, 4, 5, 6, 7]
java data [[0], [1], [2], [3], [4], [5], [6], [7]]
Exception in thread "main" Assertion failed: 

assert TestJava.call(data) == 1
                |    |     |
                8    |     false
                     [0, 1, 2, 3, 4, 5, 6, 7]

	at org.codehaus.groovy.runtime.InvokerHelper.assertFailed(InvokerHelper.java:404)
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.assertFailed(ScriptBytecodeAdapter.java:650)
	at TestGroovy.main(TestGroovy.groovy:9)

TestGroovy.groovy

import groovy.transform.CompileStatic

@CompileStatic
class TestGroovy {
    static void main(String... args) {
        byte[] data = [0, 1, 2, 3, 4, 5, 6, 7]
        System.out.println("data.class " + data.class)
        System.out.println("data " + data)
        assert TestJava.call(data) == 1
    }
}

TestJava.java

import java.util.Arrays;

public class TestJava {
	public static int call(byte[]... data) {
		System.out.println("java data " + Arrays.deepToString(data));
		return data.length;
	}
}