Documentation

1. 01 VRaptor3 - One minute guide
2. 02 VRaptor3 - 10 minute guide
3. 03 Resources-Rest
4. 04 Components
5. 05 Converters
6. 06 Interceptors
7. 07 Validation
8. 08 View and Ajax
9. 09 Dependency injection
10. 10 Download and Upload
11. 11 Utility components
12. 12 Overriding Vraptor's behavior and conventions
13. 13 Spring, Joda Time and Hibernate
14. 14 Google App Engine
15. 15 Testing components and controllers
16. 16 Scala
17. 17 Optimizations
18. 18 VRaptor Scaffold
19. 19 Exception handling
20. 20 How to contribute to VRaptor
21. 21 Changelog
22. 22 Migrating from VRaptor2 to VRaptor3

16Scala

VRaptor3 also supports controllers written in Scala. The required configurations and an example are featured in this chapter.

Dependencies and Configuration

The following jars must be added to your applications's WEB-INF/lib directory:

• scala-library.jar (required, versão 2.8)
• vraptor-scala.jar (required)
• vraptor-scala-jsp.jar (optional, for Expression Language support for Scala collections in the view layer)
• scalate.jar (required)

Now, VRaptor must be configured to load the relevant plugins. In the web.xml file, define the context-param section as below:

<context-param>
    <param-name>br.com.caelum.vraptor.packages</param-name>
    <param-value>br.com.caelum.vraptor.scala</param-value>
</context-param>

Then, add to the file the required changes to use Scalate as the view:

<servlet>
    <servlet-name>TemplateEngineServlet</servlet-name>
    <servlet-class>org.fusesource.scalate.servlet.TemplateEngineServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>TemplateEngineServlet</servlet-name>
    <url-pattern>*.ssp</url-pattern>
</servlet-mapping>

Example

A VRaptor3 controller written in Scala:

@Resource
class MyController {

    @Path(Array("/hello"))
    def myLogic = "Hello, world!"

}