Architecture

jhelm Architecture

Java 21 | Spring Boot 4.0.2 | Kubernetes Client 25.0.0 | Picocli 4.7.6

Module Dependency Graph

jhelm (parent)
├── jhelm-gotemplate  — Go template engine (standalone, no Spring)
├── jhelm-core        — Helm logic, charts, actions (depends on: gotemplate)
├── jhelm-kube        — Kubernetes client integration (depends on: core)
└── jhelm-app         — CLI, Spring Boot + Picocli (depends on: core, kube)

Template Engine (jhelm-gotemplate)

• Pipeline: Lexer → Parser → AST → Executor
• Key classes: GoTemplate, GoTemplateFactory, Functions
• Functions by category: Sprig (strings, collections, logic, math, encoding, crypto, date, reflection, network, semver) and Helm (conversion, template, kubernetes, chart)
• No Spring dependency — pure Java library

Core Engine (jhelm-core)

• Engine.java — Orchestrates template processing
• Chart.java — Represents Helm charts with metadata and templates
• RepoManager.java — Manages chart repositories
• Creates new GoTemplateFactory per render to avoid template accumulation
• Stack depth tracking prevents infinite template recursion

Kubernetes Integration (jhelm-kube)

• HelmKubeService — Kubernetes resource deployment
• Uses official Kubernetes Java Client 25.0.0

CLI Application (jhelm-app)

• Spring Boot 4.0.2 application
• Picocli-based command structure
• Entry point for user-facing commands