Website Searcher

Given a list of urls in urls.txt: https://s3.amazonaws.com/fieldlens-public/urls.txt, write a program that will fetch each page and determine whether a search term exists on the page (this search can be a really rudimentary regex - this part isn't too important).

You can make up the search terms. Ignore the addition information in the urls.txt file.

Constraints

• Search is case insensitive
• Should be concurrent.
• But! It shouldn't have more than 20 HTTP requests at any given time.
• The results should be writted out to a file results.txt
• Avoid using thread pooling libraries like Executor, ThreadPoolExecutor, Celluloid, or Parallel streams.

The solution must be written in Kotlin or Java.

Sample urls.txt: https://s3.amazonaws.com/fieldlens-public/urls.txt

The solution must be able to be run from the command line (dont assume JDK is available):
java -jar ./jarFileName.jar