jpa-patterns

jpa-patterns is a skill for Claude Code, Codex from hzy970907/fish-claude-code. It costs 47 tokens per session (3,713 once invoked), scanned A, original, no licence file.

A guide to JPA and Hibernate, Java tools that map database tables to Java objects. It covers data fetching, entity relationships, transactions, queries, and common problems such as N+1 queries and LazyInitializationException.

In plain words
What is it for?
Use it to investigate JPA performance issues, fix lazy-loading errors, improve queries, and design entity relationships and fetching strategies.
Why use it?
It helps explain why database-backed Java code may be slow, fail when loading related data, or behave unexpectedly around transactions. It provides patterns for choosing how and when data is fetched.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/hzy970907/fish-claude-code/jpa-patterns
Any agent
npx skills add hzy970907/fish-claude-code --skill jpa-patterns
Clone the repo
git clone --depth 1 https://github.com/hzy970907/fish-claude-code

Made for: Claude Code, Codex.

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.

agentmods badge for jpa-patterns

README.md
[![agentmods](https://agentmods.dev/badge/skills/hzy970907/fish-claude-code/jpa-patterns.svg)](https://agentmods.dev/skills/hzy970907/fish-claude-code/jpa-patterns)
Your own site
<a href="https://agentmods.dev/skills/hzy970907/fish-claude-code/jpa-patterns"><img src="https://agentmods.dev/badge/skills/hzy970907/fish-claude-code/jpa-patterns.svg" alt="Measured on agentmods" height="20"></a>
Per session 47 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,713 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00047 $0.03713
Opus 5 $0.00023 $0.01857
Sonnet 5 $0.00009 $0.00743
Haiku 4.5 $0.00005 $0.00371

Measured 5d ago against content hash 06cfa8595b38, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

jpa-patterns 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 5d 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.

skills/jpa-patterns/SKILL.md · 658 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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.

  1. 5d ago First seen · 658 lines · 47 tokens per session scan A 06cfa8595b38

Subscribe to this mod's changes

jpa-patterns is a skill published in the GitHub repository hzy970907/fish-claude-code (23 stars, last pushed 6mo ago), with no licence file. It adds 47 tokens to every session and 3,713 once invoked, about $0.0002 per session on Opus 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 2026-08-30.

Related

Other skills, from other repositories

jpa-patterns

JPA/Hibernate patterns for entity design, relationships, query optimization, transactions, auditing, indexing, pagination, and pooling in Spring Boot.

affaan-m/ECC · 33 tokens

azure-data-tables-java

Build table storage applications with Azure Tables SDK for Java. Use when working with Azure Table Storage or Cosmos DB Table API for NoSQL key-value data, schemaless storage, or structured data at scale.

microsoft/skills · 47 tokens

azure-cosmos-java

Azure Cosmos DB SDK for Java. NoSQL database operations with global distribution, multi-model support, and reactive patterns. Triggers: "CosmosClient java", "CosmosAsyncClient", "cosmos database java", "cosmosdb java", "document database java".

microsoft/skills · 59 tokens

jpa-patterns

JPA/Hibernate patterns and common pitfalls (N+1, lazy loading, transactions, queries). Use when user has JPA performance issues, LazyInitializationException, or asks about entity relationships and fetching strategies.

decebals/claude-code-java · 47 tokens

anyline

AnyLine数据库操作开发规范,涵盖动态数据源注册切换注销、DDL动态建表改表、DML增删改与事务管理、DQL动态查询与聚合统计、元数据管理、查询结果集的聚合、过滤、格式转换等数学计算,AnyLine方法内部会自动适配100+数据库方言,调用方法时忽略不同数据库差异。.

anylineorg/anyline · 88 tokens

413-frameworks-quarkus-db-migrations-flyway

Use when you need to add or review Flyway database migrations in a Quarkus application — quarkus-flyway extension, db/migration scripts, quarkus.flyway. configuration, migrate-at-start, and alignment with JDBC or Panache. This should trigger for requests such as Add or review Flyway migrations in a Quarkus project…

jabrena/plinth · 136 tokens