Getting Started with Roo by Josh Long, Steve Mayzak

By Josh Long, Steve Mayzak

Spring Roo is going a step past the Spring Framework through bringing precise fast program improvement to Java—just as Grails has performed with Groovy. This concise advent exhibits you ways to construct functions with Roo, utilizing the framework's shell as an clever and timesaving code-completion device. It's an excellent RAD device simply because Roo does a lot of the tedious code maintenance.

You'll start via development an easy client courting administration program, whole with step by step directions and code examples. tips on how to regulate any a part of the applying with Roo's opt-in function, whereas utilizing this open resource framework to automate the remainder of the code.
* arrange a Spring program and dealing Maven construct to work out Roo in motion
* handle endurance with JPA and the Neo4j graph database—and learn the way Roo helps NoSQL databases
* Use Roo’s database reverse-engineering function to generate a knowledge version from an present schema
* construct Roo purposes with Spring MVC, Spring WebFlow, Google internet Toolkit, Vaadin, and different internet frameworks
* safe and try your program

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Even on commodity hardware, Neo4j can traverse millions of nodes in mere milliseconds regardless of dataset size. Spring Data Graph comes with an object graph mapping technology that uses conventions and some annotations (much like JPA) and leverages AspectJ under the hood to provide a transparent mapping between your POJOs and the graph database. Entities are mapped to nodes in the graph, references to other entities are mapped to relationships. You even have the ability to map relationships to real entities (Relationship Entity) that provides a much richer way of working with them.

STS agent reloading and publishing Now you’ve got a fully working system to create and manage your entities. Each entity has a page (“/list”) that displays a grid of the available entities, and there are forms to view individual entities, create new ones and update or delete existing ones. Spring Roo’s resilient to changes, too. Open up the Customer entity and add a new Date field. You can use the command line, as before, or simply type in the following: @NotNull @DateTimeFormat(style = "S-") private Date birthday; Save the entity and then watch the console; Spring Roo will update all of the existing scaffolding code.

Try it out for yourself, and you’ll agree: this is all code that you don’t want to write yourself. And, of course, Roo has generated a controller. CustomerController. Just as with the entities before, this class is spartan. Most of the magic is in the adjacent ITD files. —another controller to expose the data from the finder method we generated earlier. 24 | Chapter 2: Spring Roo on the Web Taking Our Application for a Spin We’ll dissect all of the newly generated code in a minute, but if you’re anything like me, you’re itching to see something working.

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