๐ก Spring is the most popular Java framework.
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You are free to modify and use in commercial project. There are some restrictions (e.g., you can't use the Spring trademark), but this should be ok for most projects.
๐ stackoverflow.com//questions/11178675/can-we-extend-spring-source-code-when-working-for-a-commercial-appSpring Boot is a backend framework that has become a major player in the enterprise Java ecosystem. It lets Java developers start building web applications quickly, without fuss.
๐ vaadin.com//blog/comparing-frontend-frameworks-for-spring-boot-react-angular-and-vaadin-jhipsterYes. Whenever someone uses Spring Boot for creating RESTful web services, chances are they are using Spring MVC (part of Spring Web starter, see http://start.spring.io and search Web in dependencies) although Spring has also been offering another web framework, Spring WebFlux.
๐ www.quora.com//Is-Spring-MVC-still-used-in-2020The Spring Framework (Spring) is an open-source application framework that provides infrastructure support for developing Java applications. One of the most popular Java Enterprise Edition (Java EE) frameworks, Spring helps developers create high performing applications using plain old Java objects (POJOs).
๐ www.techtarget.com//searchapparchitecture/definition/Spring-Framework