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Agent skill

Java Coding Standards

by vibeeval in vibeeval/vibecosystem

Java coding standards for Spring Boot services: naming, immutability, Optional usage, streams, exceptions, generics, and project layout.

MITAuto-check passedDevelopment

Install Java Coding Standards

skills CLI
$ npx skills add vibeeval/vibecosystem --skill java-coding-standards -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install vibeeval/vibecosystem java-coding-standards --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/vibeeval/vibecosystem.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/java-coding-standards .claude/skills/java-coding-standards && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
java-coding-standards
GitHub stars
531
Used in
3 other repos
Token cost
~877 tokens
SKILL.md length
207 words
Files
1
Skills in repo
144
Repo updated
First seen
Licence
MIT

At a glance

Java coding standards for Spring Boot services: naming, immutability, Optional usage, streams, exceptions, generics, and project layout.

  • Tasks that involve Code quality
  • SKILL.md covers Core Principles, Naming, Immutability and Optional Usage, plus 9 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Tasks that involve Backend development

What it does

Java Coding Standards is an agent skill from vibeeval/vibecosystem. Java coding standards for Spring Boot services: naming, immutability, Optional usage, streams, exceptions, generics, and project layout.

Its SKILL.md is about 880 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development, covering Code quality and Backend development. It works with Java and Spring Boot. The repository describes itself as: AI software team for Claude Code - 138 agents, 295 skills, 73 hooks. Self-learning, multi-agent swarm, autonomous skill evolution. The licence is MIT.

When your agent uses it

  • Tasks that involve Code quality
  • Tasks that involve Backend development

Example prompts

  • “/java-coding-standards”

What it can do on your machine

Read from SKILL.md and the folder at commit 3b763b1. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are java).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Java Coding Standards loads about 877 tokens when it runs. Until then it costs about 40 tokens; SKILL.md has 207 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~40
When it runs · the whole SKILL.md, loaded when a task matches
~877

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from vibeeval/vibecosystem at commit 3b763b1, republished under its MIT licence (© vibeeval). 207 words, ~877 tokens.

Download SKILL.mdSave it as .claude/skills/java-coding-standards/SKILL.md (or your agent's skills folder).
name
java-coding-standards
description
Java coding standards for Spring Boot services: naming, immutability, Optional usage, streams, exceptions, generics, and project layout.

Java Coding Standards

Standards for readable, maintainable Java (17+) code in Spring Boot services.

Core Principles

  • Prefer clarity over cleverness
  • Immutable by default; minimize shared mutable state
  • Fail fast with meaningful exceptions
  • Consistent naming and package structure

Naming

java
// ✅ Classes/Records: PascalCase
public class MarketService {}
public record Money(BigDecimal amount, Currency currency) {}

// ✅ Methods/fields: camelCase
private final MarketRepository marketRepository;
public Market findBySlug(String slug) {}

// ✅ Constants: UPPER_SNAKE_CASE
private static final int MAX_PAGE_SIZE = 100;

Immutability

java
// ✅ Favor records and final fields
public record MarketDto(Long id, String name, MarketStatus status) {}

public class Market {
  private final Long id;
  private final String name;
  // getters only, no setters
}

Optional Usage

java
// ✅ Return Optional from find* methods
Optional<Market> market = marketRepository.findBySlug(slug);

// ✅ Map/flatMap instead of get()
return market
    .map(MarketResponse::from)
    .orElseThrow(() -> new EntityNotFoundException("Market not found"));

Streams Best Practices

java
// ✅ Use streams for transformations, keep pipelines short
List<String> names = markets.stream()
    .map(Market::name)
    .filter(Objects::nonNull)
    .toList();

// ❌ Avoid complex nested streams; prefer loops for clarity

Exceptions

  • Use unchecked exceptions for domain errors; wrap technical exceptions with context
  • Create domain-specific exceptions (e.g., MarketNotFoundException)
  • Avoid broad catch (Exception ex) unless rethrowing/logging centrally
java
throw new MarketNotFoundException(slug);

Generics and Type Safety

  • Avoid raw types; declare generic parameters
  • Prefer bounded generics for reusable utilities
java
public <T extends Identifiable> Map<Long, T> indexById(Collection<T> items) { ... }

Project Structure (Maven/Gradle)

src/main/java/com/example/app/
  config/
  controller/
  service/
  repository/
  domain/
  dto/
  util/
src/main/resources/
  application.yml
src/test/java/... (mirrors main)

Formatting and Style

  • Use 2 or 4 spaces consistently (project standard)
  • One public top-level type per file
  • Keep methods short and focused; extract helpers
  • Order members: constants, fields, constructors, public methods, protected, private

Code Smells to Avoid

  • Long parameter lists → use DTO/builders
  • Deep nesting → early returns
  • Magic numbers → named constants
  • Static mutable state → prefer dependency injection
  • Silent catch blocks → log and act or rethrow

Logging

java
private static final Logger log = LoggerFactory.getLogger(MarketService.class);
log.info("fetch_market slug={}", slug);
log.error("failed_fetch_market slug={}", slug, ex);

Null Handling

  • Accept @Nullable only when unavoidable; otherwise use @NonNull
  • Use Bean Validation (@NotNull, @NotBlank) on inputs

Testing Expectations

  • JUnit 5 + AssertJ for fluent assertions
  • Mockito for mocking; avoid partial mocks where possible
  • Favor deterministic tests; no hidden sleeps

Remember: Keep code intentional, typed, and observable. Optimize for maintainability over micro-optimizations unless proven necessary.

© vibeeval, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/java-coding-standards of vibeeval/vibecosystem.

Open the folder on GitHubat commit 3b763b1

Used in 3 other repositories

We found 7 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 3 other GitHub owners. This page covers the copy in vibeeval/vibecosystem, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Java Coding Standards next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Java Coding Standards compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Java Coding Standards this skillvibeeval/vibecosystem5313 repos~877Automated safety check: PassMIT
Java Coding Standardsaffaan-m/ECC274k1 repos~2.9kAutomated safety check: PassMIT
Java Coding Standardsxu-xiang/everything-claude-code-zh2k—~779Automated safety check: PassMIT
Java Coding Standardsaffaan-m/ECC274k2 repos~668Automated safety check: PassMIT
Java Coding Standardsxu-xiang/everything-claude-code-zh2k—~676Automated safety check: PassMIT
Java Coding StandardsSnailclimb/AIGuide667—~1kAutomated safety check: PassNone

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Works with

Categories

Questions about Java Coding Standards

What does Java Coding Standards do?

Java coding standards for Spring Boot services: naming, immutability, Optional usage, streams, exceptions, generics, and project layout. Java Coding Standards is an agent skill from vibeeval/vibecosystem. Java coding standards for Spring Boot services: naming, immutability, Optional usage, streams, exceptions, generics, and project layout.

When should I use Java Coding Standards?

Java Coding Standards fits situations like: tasks that involve Code quality; tasks that involve Backend development.

How do I install Java Coding Standards in Claude Code?

Run `npx skills add vibeeval/vibecosystem --skill java-coding-standards -a claude-code`. Or copy the skill folder (skills/java-coding-standards in vibeeval/vibecosystem) into .claude/skills/java-coding-standards in your project. Claude Code loads it when a task matches its description.

How do I install Java Coding Standards in Codex?

Run `npx skills add vibeeval/vibecosystem --skill java-coding-standards -a codex`. Or copy the skill folder (skills/java-coding-standards in vibeeval/vibecosystem) into .agents/skills/java-coding-standards in your project. Codex loads it when a task matches its description.

Can I use Java Coding Standards in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add vibeeval/vibecosystem --skill java-coding-standards -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/java-coding-standards, .gemini/skills/java-coding-standards, .github/skills/java-coding-standards and .opencode/skills/java-coding-standards in your project.

What does Java Coding Standards need to run?

SKILL.md names no scripts, command-line tools or credentials: Java Coding Standards is instructions for the agent only.

Does Java Coding Standards access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Java Coding Standards safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Java Coding Standards use?

Java Coding Standards is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Java Coding Standards use?

About 877 tokens (SKILL.md is roughly 3.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Java Coding Standards?

Skills that share tags, products or a category with Java Coding Standards: Java Coding Standards (affaan-m/ECC, 274k stars), Java Coding Standards (xu-xiang/everything-claude-code-zh, 2k stars), Java Coding Standards (affaan-m/ECC, 274k stars) and Java Coding Standards (xu-xiang/everything-claude-code-zh, 2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Java Coding Standards?

vibeeval (a GitHub user) maintains it in vibeeval/vibecosystem, which has 531 GitHub stars. The repository holds 144 skills in this directory. The repository was last updated on August 8, 2026.

Source: vibeeval/vibecosystem on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.