RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.

Building a RESTful Web Service :: Learn how to create a RESTful web service with Spring.

DJI Mobile SDK for Android: http://developer.dji.com/mobile-sdk/

Building an Application with Spring Boot :: Learn how to build an application with minimal configuration.

Using WebSocket to build an interactive web application :: Learn how to the send and receive messages between a browser and the server over a WebSocket

Uploading Files :: Learn how to build a Spring application that accepts multi-part file uploads.

Command-line shell for interacting with Spring HATEOAS-compliant REST resources

Securing a Web Application :: Learn how to protect your web application with Spring Security.

Dashboard for visualizing Spring Boot microservices and the components they link to.

Serving Web Content with Spring MVC :: Learn how to create a web page with Spring MVC and Thymeleaf.

Messaging with RabbitMQ :: Learn how to create a simple publish-and-subscribe application with Spring and RabbitMQ.

Producing a SOAP web service :: Learn how to create a SOAP-based web service with Spring.

A Java framework for web applications using a functional reactive style built on RxJava

RDF-Centric Map/Reduce Framework and Freebase data conversion tool

Scheduling Tasks :: Learn how to schedule tasks with Spring.

Validating Form Input :: Learn how to perform form validation with Spring.

Enabling Cross Origin Requests for a RESTful Web Service :: Learn how to create a RESTful web service with Spring that support Cross-Origin Resource Sharing (CORS).

Authenticating a User with LDAP :: Learn how to secure an application with LDAP.

Messaging with JMS :: Learn how to publish and subscribe to messages using a JMS broker.

Messaging with Redis :: Learn how to use Redis as a message broker.

Building a Hypermedia-Driven RESTful Web Service :: Learn how to create a hypermedia-driven RESTful Web service with Spring.

A set of classes for using Elasticsearch in a Dropwizard service.