Agent skill

Java Coding Standards

Spring Boot服务的Java编码标准：命名、不可变性、Optional用法、流、异常、泛型和项目布局. An agent skill from affaan-m/ECC.

Install Java Coding Standards

skills CLI

$ npx skills add affaan-m/ECC --skill java-coding-standards -a claude-code

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

GitHub CLI

$ gh skill install affaan-m/ECC 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/affaan-m/ECC.git skills-src && mkdir -p .claude/skills && cp -r skills-src/docs/zh-CN/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/

Paste into Claude Code

Install the "java-coding-standards" agent skill from https://github.com/affaan-m/ECC/tree/main/docs/zh-CN/skills/java-coding-standards into .claude/skills/java-coding-standards/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "java-coding-standards", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/affaan-m/ECC/tree/main/docs/zh-CN/skills/java-coding-standards

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add affaan-m/ECC --skill java-coding-standards -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install affaan-m/ECC java-coding-standards --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/affaan-m/ECC.git skills-src && mkdir -p .agents/skills && cp -r skills-src/docs/zh-CN/skills/java-coding-standards .agents/skills/java-coding-standards && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "java-coding-standards" agent skill from https://github.com/affaan-m/ECC/tree/main/docs/zh-CN/skills/java-coding-standards into .agents/skills/java-coding-standards/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "java-coding-standards", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add affaan-m/ECC --skill java-coding-standards -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install affaan-m/ECC java-coding-standards --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/affaan-m/ECC.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/docs/zh-CN/skills/java-coding-standards .cursor/skills/java-coding-standards && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "java-coding-standards" agent skill from https://github.com/affaan-m/ECC/tree/main/docs/zh-CN/skills/java-coding-standards into .cursor/skills/java-coding-standards/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "java-coding-standards", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/affaan-m/ECC.git --path docs/zh-CN/skills/java-coding-standards

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add affaan-m/ECC --skill java-coding-standards -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install affaan-m/ECC java-coding-standards --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/affaan-m/ECC.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/docs/zh-CN/skills/java-coding-standards .gemini/skills/java-coding-standards && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "java-coding-standards" agent skill from https://github.com/affaan-m/ECC/tree/main/docs/zh-CN/skills/java-coding-standards into .gemini/skills/java-coding-standards/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "java-coding-standards", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install affaan-m/ECC java-coding-standards

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add affaan-m/ECC --skill java-coding-standards -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/affaan-m/ECC.git skills-src && mkdir -p .github/skills && cp -r skills-src/docs/zh-CN/skills/java-coding-standards .github/skills/java-coding-standards && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "java-coding-standards" agent skill from https://github.com/affaan-m/ECC/tree/main/docs/zh-CN/skills/java-coding-standards into .github/skills/java-coding-standards/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "java-coding-standards", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add affaan-m/ECC --skill java-coding-standards -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install affaan-m/ECC java-coding-standards --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/affaan-m/ECC.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/docs/zh-CN/skills/java-coding-standards .opencode/skills/java-coding-standards && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "java-coding-standards" agent skill from https://github.com/affaan-m/ECC/tree/main/docs/zh-CN/skills/java-coding-standards into .opencode/skills/java-coding-standards/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "java-coding-standards", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: java-coding-standards
GitHub stars: 274k
Used in: 3 other repos
Token cost: ~675 tokens
SKILL.md length: 87 words
Files: 1
Skills in repo: 657
Repo updated: Oct 5, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Spring Boot服务的Java编码标准：命名、不可变性、Optional用法、流、异常、泛型和项目布局. An agent skill from affaan-m/ECC.

Tasks that involve Code quality
SKILL.md covers 何时激活, 核心原则, 命名 and 不可变性, plus 10 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 affaan-m/ECC. Spring Boot服务的Java编码标准：命名、不可变性、Optional用法、流、异常、泛型和项目布局。

Its SKILL.md is about 680 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 Backend & APIs, covering Code quality and Backend development. It works with Java and Spring Boot. The repository describes itself as: The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond. 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 ef648e0. 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 675 tokens when it runs. Until then it costs about 19 tokens; SKILL.md has 87 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~19
When it runs · the whole SKILL.md, loaded when a task matches: ~675

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 affaan-m/ECC at commit ef648e0, republished under its MIT licence (© affaan-m). 87 words, ~675 tokens.

Download SKILL.mdSave it as .claude/skills/java-coding-standards/SKILL.md (or your agent's skills folder).

name: java-coding-standards
description: Spring Boot服务的Java编码标准：命名、不可变性、Optional用法、流、异常、泛型和项目布局。
origin: ECC

Java 编码规范

适用于 Spring Boot 服务中可读、可维护的 Java (17+) 代码的规范。

何时激活

在 Spring Boot 项目中编写或审查 Java 代码时
强制执行命名、不可变性或异常处理约定时
使用记录类、密封类或模式匹配（Java 17+）时
审查 Optional、流或泛型的使用时
构建包和项目布局时

核心原则

清晰优于巧妙
默认不可变；最小化共享可变状态
快速失败并提供有意义的异常
一致的命名和包结构

命名

java

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

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

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

不可变性

java

// PASS: 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 使用

java

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

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

Streams 最佳实践

java

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

// FAIL: Avoid complex nested streams; prefer loops for clarity

异常

领域错误使用非受检异常；包装技术异常时提供上下文
创建特定领域的异常（例如，MarketNotFoundException）
避免宽泛的 catch (Exception ex)，除非在中心位置重新抛出/记录

java

throw new MarketNotFoundException(slug);

泛型和类型安全

避免原始类型；声明泛型参数
对于可复用的工具类，优先使用有界泛型

java

public <T extends Identifiable> Map<Long, T> indexById(Collection<T> items) { ... }

项目结构 (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)

格式化和风格

一致地使用 2 或 4 个空格（项目标准）
每个文件一个公共顶级类型
保持方法简短且专注；提取辅助方法
成员顺序：常量、字段、构造函数、公共方法、受保护方法、私有方法

需要避免的代码坏味道

长参数列表 → 使用 DTO/构建器
深度嵌套 → 提前返回
魔法数字 → 命名常量
静态可变状态 → 优先使用依赖注入
静默捕获块 → 记录日志并处理或重新抛出

日志记录

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 处理

仅在不可避免时接受 @Nullable；否则使用 @NonNull
在输入上使用 Bean 验证（@NotNull, @NotBlank）

测试期望

使用 JUnit 5 + AssertJ 进行流畅的断言
使用 Mockito 进行模拟；尽可能避免部分模拟
倾向于确定性测试；没有隐藏的休眠

记住：保持代码意图明确、类型安全且可观察。除非证明有必要，否则优先考虑可维护性而非微优化。

Files

Just SKILL.md in docs/zh-CN/skills/java-coding-standards of affaan-m/ECC.

Open the folder on GitHubat commit ef648e0

Used in 3 other repositories

We found 3 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 3 other GitHub owners. This page covers the copy in affaan-m/ECC, 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
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Java Coding Standards this skillaffaan-m/ECC	274k	3 repos	~675	Automated safety check: Pass	MIT	2 days ago
Java Coding StandardsSnailclimb/AIGuide	667	—	~1k	Automated safety check: Pass	None	3 mo ago
Java Coding Standardsxu-xiang/everything-claude-code-zh	2k	—	~676	Automated safety check: Pass	MIT	7 mo ago
Java Coding Standardsvibeeval/vibecosystem	531	3 repos	~877	Automated safety check: Pass	MIT	1 mo ago
Java Coding Standardsxu-xiang/everything-claude-code-zh	2k	—	~779	Automated safety check: Pass	MIT	7 mo ago
Spring Bootpiomin/claude-ai-spring-boot	1.3k	—	~2k	Automated safety check: Pass	Apache-2.0	5 mo ago

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Java Coding Standards
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Questions about Java Coding Standards

What does Java Coding Standards do?

Spring Boot服务的Java编码标准：命名、不可变性、Optional用法、流、异常、泛型和项目布局. An agent skill from affaan-m/ECC. Java Coding Standards is an agent skill from affaan-m/ECC.

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 affaan-m/ECC --skill java-coding-standards -a claude-code`. Or copy the skill folder (docs/zh-CN/skills/java-coding-standards in affaan-m/ECC) 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 affaan-m/ECC --skill java-coding-standards -a codex`. Or copy the skill folder (docs/zh-CN/skills/java-coding-standards in affaan-m/ECC) 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 affaan-m/ECC --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 675 tokens (SKILL.md is roughly 2.7k 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 (Snailclimb/AIGuide, 667 stars), Java Coding Standards (xu-xiang/everything-claude-code-zh, 2k stars), Java Coding Standards (vibeeval/vibecosystem, 531 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?

affaan-m (a GitHub user) maintains it in affaan-m/ECC, which has 274,360 GitHub stars. The repository holds 657 skills in this directory. The repository was last updated on October 5, 2026.

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

Install Java Coding Standards

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Java 编码规范

何时激活

核心原则

命名

不可变性

Optional 使用

Streams 最佳实践

异常

泛型和类型安全

项目结构 (Maven/Gradle)

格式化和风格

需要避免的代码坏味道

日志记录

Null 处理

测试期望

Files

Used in 3 other repositories

Compare with similar skills

Similar skills

More from affaan-m/ECC

Related

Questions about Java Coding Standards