Spring Boot + Kotlin type safe template rendering with i18n and nested template support. This feature is considered experimental since there is a lot of things to wire manually, no cross-site scripting protection out of the box, the caching mechanism need to be improved, etc.

It requires Spring Framework 5.2 and Kotlin 1.3.40+.

Make sure to configure Spring Boot Gradle plugin as following to mke it working with Boot fat JAR.

build.gradle.kts

tasks.withType<BootJar> {
	requiresUnpack("**/kotlin-compiler-*.jar")
}

These templates look like:

import io.spring.demo.*

"""
${include("header")}
<h1>${i18n("title")}</h1>
<ul>
	${users.joinToLine{ "<li>${i18n("user")} ${it.firstname} ${it.lastname}</li>" }}
</ul>
${include("footer")}
"""

To enable variable resolution in .kts files in IDEA, go to menu preferences -> Build, Execution, Deployement -> Compiler -> Kotlin Compiler and set:

• Script templates class: kotlin.script.templates.standard.ScriptTemplateWithBindings
• Script templates classpath: /path/to/kotlin-script-runtime.jar

This may be configured automatically in future version of IDEA Kotlin plugin.

Feel free to send pull requests to improve it!