How to get to the application from outside TomCat?

Question

Java

I'm trying to get to the application from everyone, please tell me where I turned the wrong way!
Everything is in order, TomKat is installed on Ubuntu 16.04, it is deployed on port 8087, within the local network, for example, I can get to the application from a laptop, I opened the port and checked it through the site, it says that I opened it.
The first router - receives the Internet
The second router is connected to the first one with a twisted pair cable and distributes the Internet via Wi-Fi around the house.
How my Internet is organized - there are two routers, one from the provider, the other is TP-Link, the first one receives the Internet from the provider, then sends it to the second with a cable, the second distributes Wi-Fi around the house.
What I did, on the second router I gave out a static Ip to the computer on which I deploy TomCat, also on the second router I forwarded a port to this static ip, I also chose to receive ip statically from the first router on it, and on the first router I forwarded port 8087 to a static ip of the second router, Now I enter the protocol in the browser: // my external IP: port / application name / and the browser says that it is not possible to access the site! Tell me what I did wrong?!