Take a class Test like this :

public class Test {
public static void test(java.lang.Long a){
System.out.println("test1");
}
}

Try this :

var java=require('java')
java.classpath.push('./test.jar');
var Test = java.import('Test');
Test.testSync(java.newInstanceSync("java.lang.Long", 1));

Gives :

Error: Could not find method "test(java.lang.Integer)" on class "class Test".
Possible matches:
public static void Test.test(java.lang.Long)

done it with last build.

Regards.