Using the Enable dictionary found at The National Puzzlers' League. Removed entries with fewer than 3 characters.

curl http://www.puzzlers.org/pub/wordlists/enable1.txt | grep -E -e "...+" > boggle.dict

Grabbed the CSS from Shane da Silva's Boggle Solver to get me going.

AngularJS had a nice tutorial and reference to get me going after taking a look at this article on using it with Spring Boot

The application was initially generated with Spring Iinitializr

Rules for Boggle. It wouldn't be difficult to include the total possible score for a given board.