Tech Stack and Technologies Used

Link to https://github.com/OpenMRS-Australia/openmrs-cpm/wiki/Resources

The core is built on Java but current development has leveraged REST services to enable client side development in AngularJS as show in the diagram below

Links to technologies used

AngularJS (Training material: http://docs.angularjs.org/tutorial / )
Spring
Hibernate

Build process uses Gradle (previously was Maven)

BDD via Cucumber

References

REST

Spring RestTemplate: http://www.springframework.net/rest/doc-latest/reference/html/resttemplate.html / http://spring.io/blog/2009/03/27/rest-in-spring-3-resttemplate/
Consuming a RESTful Web Service with AngularJS: https://spring.io/guides/gs/consuming-rest-angularjs/

Testing

Page Objects: https://code.google.com/p/selenium/wiki/PageObjects
Timing Races: http://www.bizalgo.com/2012/01/14/timing-races-selenium-2-implicit-waits-explicit-waits/