In my opinion, your best bet would be to probably do it in Java. Here’s sample code for a Java service that takes two String Lists, a and b, and outputs c. NOTE: the code assumes b is the same length as a.
Now if you want to stick with Flow, you can do something similar with three simple steps. Suppose the service takes the same inputs, a and b, and outputs c:
That’s it!
Good luck,
Percio
#Integration-Server-and-ESB#webMethods#Flow-and-Java-services