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java SKILL.md skillA

java from yuecao365/offercome is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned
mdr add yuecao365/offercome/java@git:20260920.a4843f5

Pins git:20260920.a4843f5 in mdr.lock. Pin the fingerprint instead.

Audit grade
A, 17 of 17 checks passed
Kind
SKILL.md skill
Repository
yuecao365/offercome
Path
src/lib/mock-interviews/skills/java/SKILL.md
Versions recorded
1
Latest version
git:20260920.a4843f5, committed Sep 20, 2026
Size
13,871 bytes
Repository stars
24
License
MIT

Java 后端怎么面：JVM 与 GC、并发 JUC、Spring、持久层、微服务组件。JD 点名 Java 时读。.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

## 面试官在意什么

Java 后端是国内互联网公司体量最大的后端岗位，日常是在 Spring Boot / Spring Cloud 或 Dubbo 体系里写业务服务、接中间件、处理线上问题。真实面试里 Java 方向有一条非常稳定的主线：JVM 内存与 GC、并发（线程池、锁、JUC 工具）、Spring 原理（IoC、AOP、事务）、持久层（MyBatis/JPA 与连接池）、微服务组件（注册中心、网关、配置中心、RPC）。这些题被问烂了，所以面试官最在意的不是候选人能不能背出 CMS 和 G1 的区别，而是三件事：一是遇到 OOM、CPU 飙高、接口变慢、线程池打满时有没有真实排查过，用什么工具、看什么数据；二是对 Spring 这类"魔法"背后的机制是否真的理解，能否解释自己项目里某个注解为什么不生效；三是并发代码能不能写对，能不能指出一段代码里的竞态。

校招侧重基础：集合源码（HashMap、ConcurrentHashMap）、synchronized 与 ReentrantLock、JVM 内存区域与垃圾回收基本流程、Spring Bean 生命周期、手写线程安全的单例或生产者消费者。社招侧重排查与设计：线上 Full GC 频繁怎么定位、线程池参数怎么定、@Transactional 失效的场景、分布式锁的坑、微服务之间调用超时链路、JDK 17/21 的虚拟线程对现有模型的影响。一线大厂近年明显减少了纯八股，改为"给你一段代码/一个现象，说问题在哪"。

怎么问才像这个方向的面试官：
- 架构与方法论（缓存一致性、消息队列、限流降级）交给 backend 包，本包专注 Java 生态的实现细节与排查手段。
- 八股必须落到现象：任何原理题都要配一个"线上会怎么表现""你怎么验证"的追问，能背不能用的要标记。
- 代码级追问：并发、事务、集合相关主题优先给一段代码或一个现象让候选人找问题，而不是让他复述概念。
- 按 JDK 版本与项目规模出题：还在 JDK 8 的项目不追虚拟线程；小项目不追 ZGC 与容器内存分配，但必须会读 GC 日志与线程栈。
- 2026 年 Java 后端的生产基线是 JDK 21 / 25 与 Spring Boot 3 / 4：虚拟线程接管 IO 密集服务后线程池调优这类老题会反过来问"什么时候不该用虚拟线程"（pinning、CPU 密集、ThreadLocal 膨胀）；紧凑对象头、分代 ZGC、Spring 的 HTTP Service Client 与空安全注解是新的追问点；接大模型的服务会追 Spring AI 一类集成的超时、重试与成本控制。

## 项目 / 实习怎么深挖
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint
mdr add yuecao365/offercome/java@sha256:a42063ae5ce4240c

The line at the top of this page pins the label git:20260920.a4843f5, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_q4c5vidffwdqlkv2.svg)](https://markdownregistry.com/a/art_q4c5vidffwdqlkv2)

4 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Sep 20, 2026.

versioncommittedcommitsizeaudit
git:20260920.a4843f5 latest2026-09-20 a4843f5 13,871 BA view

Audit of the latest version

A  17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (13871 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

yuecao365/offercome · 24 stars · license MIT · pushed 2026-10-01 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_q4c5vidffwdqlkv2
GET https://markdownregistry.com/api/v1/resolve?ref=yuecao365/offercome/java
GET https://markdownregistry.com/api/v1/blob/a42063ae5ce4240ceb4a9cfe79e9647dee5d033921ecaf99fdd69956551afa15

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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