Skills

runtime-spring-boot

Installation
SKILL.md

BoxLang with Spring Boot

Overview

The boxlang-spring-boot-starter automatically configures BoxLang as a view engine inside any Spring Boot 3.x application. Spring controllers return logical view names, which Spring resolves to .bxm template files. Spring Model attributes are available directly in templates via the BoxLang variables scope.

Requirements: Spring Boot 3.x · BoxLang 1.11.0+ · JDK 21+

Dependency

Gradle

dependencies {
    implementation "io.boxlang:boxlang-spring-boot-starter:1.0.0"
}

Maven

<dependency>
    <groupId>io.boxlang</groupId>
    <artifactId>boxlang-spring-boot-starter</artifactId>
    <version>1.0.0</version>
</dependency>

Zero-Config Setup

Adding the dependency activates BoxLangAutoConfiguration, which registers:

  • BoxLangViewResolver — resolves view names to classpath:/templates/<name>.bxm
  • BoxLang runtime singleton (BoxRuntime.getInstance())

No additional configuration is required to get started.

Spring Controller

Return a logical view name (without path or extension) from a controller method:

@Controller
public class HomeController {

    @GetMapping("/")
    public String home( Model model ){
        model.addAttribute( "title",   "Welcome" );
        model.addAttribute( "message", "Hello from BoxLang!" );
        return "home";   // → classpath:/templates/home.bxm
    }

    @GetMapping("/users")
    public String users( Model model ){
        model.addAttribute( "users", userRepository.findAll() );
        return "users";  // → classpath:/templates/users.bxm
    }
}

Template Structure

Templates live in src/main/resources/templates/ and use the .bxm extension:

src/
└── main/
    ├── java/           ← Spring controllers, services
    └── resources/
        ├── application.properties
        └── templates/
            ├── home.bxm
            ├── users.bxm
            └── partials/
                └── header.bxm

.bxm Template — Accessing Model Attributes

Spring Model attributes are available directly in the BoxLang variables scope:

<!-- src/main/resources/templates/home.bxm -->
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title><bx:output>#encodeForHTML( title )#</bx:output></title>
</head>
<body>
    <h1><bx:output>#encodeForHTML( title )#</bx:output></h1>
    <p><bx:output>#encodeForHTML( message )#</bx:output></p>
</body>
</html>

All three forms are equivalent:

<bx:output>#title#</bx:output>
<bx:output>#variables.title#</bx:output>
<!--- or use script inside a bx:script block --->

Iterating Collections

<!-- templates/users.bxm -->
<bx:output>
<ul>
    <bx:loop array="#users#" item="user">
        <li>#encodeForHTML( user.name )# — #encodeForHTML( user.email )#</li>
    </bx:loop>
</ul>
</bx:output>

Conditional Rendering

<bx:if condition="#isLoggedIn#">
    <p>Welcome back, <bx:output>#encodeForHTML( currentUser.name )#</bx:output>!</p>
<bx:else>
    <p><a href="/login">Log in</a></p>
</bx:if>

Including Partials

<!DOCTYPE html>
<html>
<head>
    <bx:include template="/templates/partials/head.bxm">
</head>
<body>
    <bx:include template="/templates/partials/nav.bxm">
    <main>
        <!-- page content here -->
    </main>
</body>
</html>

Configuration (application.properties)

BoxLang settings are namespaced under boxlang.*:

# Template prefix/suffix (defaults shown)
boxlang.webserver.templatesPath=classpath:/templates/
boxlang.webserver.templatesSuffix=.bxm

# BoxLang home directory
boxlang.home=/opt/boxlang

# Log level
boxlang.logging.level=INFO

# View resolver order (lower = higher priority; coexist with Thymeleaf etc.)
boxlang.viewResolver.order=1

Coexisting with Thymeleaf / FreeMarker

BoxLangViewResolver participates in Spring's standard resolver chain. Configure the resolver order to establish priority:

# BoxLang handles .bxm; Thymeleaf handles .html
boxlang.viewResolver.order=1
spring.thymeleaf.order=2

Direct Runtime Access from Java

You can access the BoxLang runtime directly from any Spring bean:

import ortus.boxlang.runtime.BoxRuntime;
import ortus.boxlang.runtime.scopes.Key;

@Service
public class BoxLangService {

    private final BoxRuntime boxlang = BoxRuntime.getInstance();

    public String renderSnippet(){
        // Execute an inline BoxLang expression
        return boxlang.executeStatement( "now().format('yyyy-MM-dd')" );
    }
}

Checklist

  • boxlang-spring-boot-starter on the classpath
  • Spring Boot 3.x and JDK 21+ in use
  • Templates in src/main/resources/templates/ with .bxm extension
  • Controllers return logical view names (no path prefix, no extension)
  • Model attributes encoded with encodeForHTML() before output
  • Resolver order configured when coexisting with other view technologies
  • Secrets and sensitive config in application.properties via environment variable placeholders, not hard-coded
Related skills

More from ortus-boxlang/skills

Installs
1
Repository
ortus-boxlang/skills
First Seen
Apr 21, 2026