What is vaadin-java-fullstack-ui?

A guide for building web interfaces entirely in Java with Vaadin Flow. Vaadin renders the interface from server-side Java code, so the application does not need a separate JavaScript UI framework.

Use it for internal tools, dashboards, administration screens, and business portals with Java views, forms, data grids, and server-side data binding.

It helps Java teams structure views, validation, data loading, accessibility, and session protection consistently. It also keeps business rules out of the user-interface layer.

vaadin-java-fullstack-ui — Skill for Claude Code by vaquarkhan

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add vaquarkhan/Fullstack-development-agent-skills --skill vaadin-java-fullstack-ui

Clone the repo

git clone --depth 1 https://github.com/vaquarkhan/Fullstack-development-agent-skills

Made for: Claude Code.

Or install fullstack-development-agent-skills, the plugin that ships this one along with the rest of its 129 skills, 10 commands.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/vaquarkhan/fullstack-development-agent-skills/vaadin-java-fullstack-ui/github.svg)](https://agentmods.dev/skills/vaquarkhan/fullstack-development-agent-skills/vaadin-java-fullstack-ui)

Your own site

<a href="https://agentmods.dev/skills/vaquarkhan/fullstack-development-agent-skills/vaadin-java-fullstack-ui"><img src="https://agentmods.dev/badge/skills/vaquarkhan/fullstack-development-agent-skills/vaadin-java-fullstack-ui/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/vaquarkhan/fullstack-development-agent-skills/vaadin-java-fullstack-ui"><img src="https://agentmods.dev/badge/skills/vaquarkhan/fullstack-development-agent-skills/vaadin-java-fullstack-ui.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 564 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00049	$0.00564
Opus 5.5	$0.00020	$0.00226
Sonnet 5.5	$0.00010	$0.00113
Haiku 4.5	$0.00005	$0.00056

Measured 2mo ago against content hash 7d60fb5643c9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

vaadin-java-fullstack-ui scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skill-packs/java/vaadin/vaadin-java-fullstack-ui/SKILL.md · 60 lines

How it starts

The opening of the file, as written. The whole thing — 60 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Vaadin Java Fullstack UI

Use When

Building enterprise web UIs with Java only (no React/Angular/Vue in the stack)
Internal admin tools, dashboards, or B2B portals need rapid Java-centric delivery
Server-driven UI with automatic client sync via Vaadin Flow is acceptable

Workflow

Create @Route views extending VerticalLayout or similar layouts.
Bind UI components to domain data with Binder<T> and validators.
Inject Spring services with @Autowired constructor in @Route views (Spring Boot + Vaadin).
Use lazy loading grids (CallbackDataProvider) for large datasets.
Apply theme and accessibility; test with Vaadin TestBench or component unit tests.

Required Checks

No business logic duplicated in UI — delegate to service layer
Grids and lists use lazy data providers for tables over ~100 rows
Session timeout and CSRF handled per Vaadin + Spring Security integration guide
Push enabled only when needed (WebSocket/Long polling) — understand server load

Examples And Templates

See examples/ for side-by-side good vs bad patterns agents commonly get wrong. See templates/ for copy-paste starters aligned with this skill.

Decision Framework

Prefer Vaadin when team skill is Java-heavy and UI complexity is forms/grids/wizards.
Use Hilla (Vaadin) if lightweight React frontend with Java endpoints is acceptable hybrid.
Prefer separate React/Next frontend when SEO, mobile-first consumer UX, or large SPA team exists.
Keep view classes thin; reuse components via @Component or composite custom components.

Common Rationalizations And Rebuttals

"Vaadin removes need for API layer." -> Still define service boundaries; may expose REST for integrations later.
"Load all data in memory for grids." -> Use CallbackDataProvider; server OOM on large tables otherwise.
"Skip Spring Security integration." -> Vaadin routes need explicit security config like any web app.

Evidence Pack

Route map with roles/permissions per view
Binder validation test for critical forms
Grid performance note (page size, filter debounce)
Screenshot or TestBench run for primary user journeys

Read the full file on GitHub · 60 lines

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 60 lines · 49 tokens per session scan A 7d60fb5643c9

Subscribe to this mod's changes

vaadin-java-fullstack-ui is a skill published in the GitHub repository vaquarkhan/Fullstack-development-agent-skills (3 stars, last pushed 2mo ago), licensed MIT. It adds 49 tokens to every session and 564 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-07.

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