Add docs for Groovy Templates

Author: Dave Syer

spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc

@@ -94,10 +94,21 @@ content into your application; rather pick only the properties that you need.
 	spring.freemarker.exposeSpringMacroHelpers=false
 	spring.freemarker.prefix=
 	spring.freemarker.requestContextAttribute=
-	spring.freemarker.suffix=
+	spring.freemarker.suffix=.ftl
 	spring.freemarker.templateEncoding=UTF-8
 	spring.freemarker.templateLoaderPath=classpath:/templates/
-	spring.freemarker.viewNames=
+	spring.freemarker.viewNames= # whitelist of view names that can be resolved
+
+	# GROOVY TEMPLATES ({sc-spring-boot-autoconfigure}}/groovy/template/GroovyTemplateAutoConfiguration.{sc-ext}[GroovyTemplateAutoConfiguration])
+	spring.groovy.template.allowRequestOverride=false
+	spring.groovy.template.allowSessionOverride=false
+	spring.groovy.template.cache=true
+	spring.groovy.template.contentType=text/html
+	spring.groovy.template.prefix=classpath:/templates/
+	spring.groovy.template.suffix=.tpl
+	spring.groovy.template.templateEncoding=UTF-8
+	spring.groovy.template.viewNames= # whitelist of view names that can be resolved
+    spring.groovy.template.configuration.*= # See Groovy's TemplateConfiguration
 
 	# INTERNATIONALIZATION ({sc-spring-boot-autoconfigure}/MessageSourceAutoConfiguration.{sc-ext}[MessageSourceAutoConfiguration])
 	spring.messages.basename=messages

spring-boot-docs/src/main/asciidoc/howto.adoc

@@ -816,8 +816,16 @@ added.
   and `spring.freemarker.suffix`, defaults ``'' and ``.ftl'' respectively). It can be overriden
   by providing a bean of the same name.
 
+* If you use Groovy templates (actually if groovy-templates is on your classpath) you
+also have a `Groovy TemplateViewResolver` with id
+  ``groovyTemplateViewResolver''. It looks for resources in a loader path by
+  surrounding the view name with a prefix and suffix (externalized to `spring.groovy.template.prefix`
+  and `spring.groovy.template.suffix`, defaults ``classpath:/templates/'' and ``.tpl'' respectively). It can be overriden
+  by providing a bean of the same name.
+
 Check out {sc-spring-boot-autoconfigure}/web/WebMvcAutoConfiguration.{sc-ext}[`WebMvcAutoConfiguration`],
-{sc-spring-boot-autoconfigure}/thymeleaf/ThymeleafAutoConfiguration.{sc-ext}[`ThymeleafAutoConfiguration`], and
+{sc-spring-boot-autoconfigure}/thymeleaf/ThymeleafAutoConfiguration.{sc-ext}[`ThymeleafAutoConfiguration`], 
+{sc-spring-boot-autoconfigure}/groovy/template/GroovyTemplateAutoConfiguration.{sc-ext}['GroovyTemplateAutoConfiguration'] and
 {sc-spring-boot-autoconfigure}/freemarker/FreeMarkerAutoConfiguration.{sc-ext}['FreeMarkerAutoConfiguration']
 
 
@@ -1381,14 +1389,19 @@ If you are using Thymeleaf, then set `spring.thymeleaf.cache` to `false`. See
 for other Thymeleaf customization options.
 
 
-
 [[howto-reload-freemarker-content]]
 === Reload FreeMarker templates without restarting the container
 If you are using FreeMarker, then set `spring.freemarker.cache` to `false`. See
 {sc-spring-boot-autoconfigure}/freemarker/FreeMarkerAutoConfiguration.{sc-ext}[`FreeMarkerAutoConfiguration`]
 for other FreeMarker customization options.
 
 
+[[howto-reload-groovy-template-content]]
+=== Reload Groovy templates without restarting the container
+If you are using Groovy templates, then set `spring.groovy.template.cache` to `false`. See
+{sc-spring-boot-autoconfigure}/groovy/template/GroovyTemplateAutoConfiguration.{sc-ext}[`GroovyTemplateAutoConfiguration`]
+for other Groovy customization options.
+
 
 [[howto-reload-java-classes-without-restarting]]
 === Reload Java classes without restarting the container

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -905,15 +905,20 @@ and it will be silently ignored by most build tools if you generate a jar.
 
 [[boot-features-spring-mvc-template-engines]]
 ==== Template engines
-As well as REST web services, you can also use Spring MVC to serve dynamic HTML content.
-Spring MVC supports a variety of templating technologies including: Velocity, FreeMarker,
-and JSPs. Many other templating engines also ship their own Spring MVC integrations.
-
-Spring Boot includes auto-configuration support for the Thymeleaf and FreeMarker
-templating engines. Thymeleaf is an XML/XHTML/HTML5 template engine that can work both in
-web and non-web environments. If allows you to create natural templates that can be
-correctly displayed by browsers and therefore work also as static prototypes. Both
-FreeMarker and Thymeleaf templates will be picked up automatically from
+
+As well as REST web services, you can also use Spring MVC to serve
+dynamic HTML content.  Spring MVC supports a variety of templating
+technologies including: Velocity, FreeMarker and JSPs. Many
+other templating engines also ship their own Spring MVC integrations.
+
+Spring Boot includes auto-configuration support for the Thymeleaf,
+[FreeMarker](http://freemarker.org/docs/) and
+[Groovy](http://beta.groovy-lang.org/docs/groovy-2.3.0/html/documentation/markup-template-engine.html)
+templating engines. Thymeleaf is an XML/XHTML/HTML5 template engine
+that can work both in web and non-web environments. If allows you to
+create natural templates that can be correctly displayed by browsers
+and therefore work also as static prototypes. Your FreeMarker, Groovy
+and Thymeleaf templates will be picked up automatically from
 `src/main/resources/templates`.