Method Release

src/java/containers/groovy.go:93–136

Release returns the Groovy startup command

()

// Release returns the Groovy startup command
func (g *GroovyContainer) Release() (string, error) {
	// Determine which script to run
	var mainScript string

	// Check for GROOVY_SCRIPT environment variable
	mainScript = os.Getenv("GROOVY_SCRIPT")

	if mainScript == "" && len(g.groovyScripts) > 0 {
		// Use Ruby buildpack logic to find the main script:
		// 1. Files with static void main() method
		// 2. Non-POGO files (simple scripts without class definitions)
		// 3. Files with shebang
		// Returns the single candidate if exactly one matches
		selectedScript, err := FindMainGroovyScript(g.groovyScripts)
		if err != nil {
			g.context.Log.Warning("Error finding main Groovy script: %s", err.Error())
		}
		if selectedScript != "" {
			mainScript = filepath.Base(selectedScript)
			g.context.Log.Debug("Selected main script: %s", mainScript)
		} else {
			// Fall back to the first script if no clear candidate
			mainScript = filepath.Base(g.groovyScripts[0])
			g.context.Log.Debug("Using first script: %s", mainScript)
		}
	}

	if mainScript == "" {
		return "", fmt.Errorf("no Groovy script specified (set GROOVY_SCRIPT)")
	}

	// Build classpath from all JARs under the app root (mirrors Ruby buildpack's add_libs + as_classpath)
	cpFlag := g.buildClasspath()

	// Note: JAVA_OPTS is set via environment variables (profile.d/java_opts.sh)
	// The groovy command reads JAVA_OPTS from the environment, not command-line args
	var cmd string
	if cpFlag != "" {
		cmd = fmt.Sprintf("$GROOVY_HOME/bin/groovy %s %s", cpFlag, mainScript)
	} else {
		cmd = fmt.Sprintf("$GROOVY_HOME/bin/groovy %s", mainScript)
	}
	return cmd, nil
}

// buildClasspath globs all JARs under the build dir and returns a "-cp <...>" flag string
// with runtime-relative paths (using $HOME), mirroring the Ruby buildpack's add_libs behaviour.