How to Implement Gateway Service something similar to Oracle API gateway Using Java and Java based Open Source frameworks only?

Why should someone use Javascript frameworks for Java-based backend services? Is there a strong set of pros and cons for this approach?

• In the Java world, there are several web application frameworks such as Spring, Struts, a few Apache ones such as Wicket, Tapestry and other such as Grails, Play etc. There are also different approaches for UI using JSP, GSP, Template based such as velocity, Freemarker etc. There is also JSF to add to the complexity.  There appears to be a problem of plenty these days ...

• Answer:

  All the frameworks you mentioned doesn't give the flexibility JavaScript gives to work with the HTML/CSS. And when you blend it with the model of consuming HTTP APIs exposed from the Java back end, you get reusable components, widgets that doesn't require any dependency on the back end except the API for the data. Javascript is a language that focuses on addressing concerns of a front end development that includes network latency where as all other frameworks you specified focus on computational complexity.