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Great web framework that greatly simplifies development in JavaScript. Good API design, good official documentation, lots of community plugins with examples.

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It's a production-ready web container, that does exactly what it is supposed to do. It's fast and lightweight, suitable for a nice development environment.

If your application does not need the extra features of a full application server, Tomcat is a great choice.

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Spring Security

Very flexible (yet somewhat complex) security framework. If your application uses Spring Framework and has security constraints, this framework is a must.

It has a steep learning curve, but once you understand its main concepts its quite easy to integrate with almost any user repository.

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