java-concurrency

Q: How do I install java-concurrency?

Run npx skills add https://github.com/pluginagentmarketplace/custom-plugin-java --skill java-concurrency in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/java-concurrency/ (personal) or .claude/skills/java-concurrency/ (project).

by pluginagentmarketplaceBackend & APIs

Master Java concurrency - threads, executors, locks, CompletableFuture, virtual threads

Installs: 466
Last 24h: —
Trending rank: —
Security: Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/pluginagentmarketplace/custom-plugin-java --skill java-concurrency

01
Install
Run the command in your project. The CLI asks which agents to install for.
02
Describe the task
Ask your agent for something this skill covers. It loads java-concurrency automatically when relevant.
03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Java Concurrency Skill

Master Java concurrency patterns for thread-safe applications.

Overview

This skill covers concurrency from basic threads to virtual threads (Java 21+), including thread pools, synchronization, and CompletableFuture.

When to Use This Skill

Use when you need to:

Write thread-safe code
Implement parallel processing
Use async programming patterns
Tune thread pools
Debug concurrency issues

Topics Covered

Thread Management

Thread lifecycle and states
Daemon vs user threads
Interrupt handling

Synchronization

synchronized, volatile
Lock interfaces (ReentrantLock)
Atomic operations

Executors

ThreadPoolExecutor configuration
ForkJoinPool
Virtual Threads (Java 21+)

CompletableFuture

Async execution
Chaining and composition
Exception handling

Quick Reference

// Virtual Threads (Java 21+)
try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
    IntStream.range(0, 10_000).forEach(i ->
        executor.submit(() -> processRequest(i)));
}

// CompletableFuture composition
CompletableFuture<Result> result = fetchUser(id)
    .thenCompose(user -> fetchOrders(user.id()))
    .thenApply(orders -> processOrders(orders))
    .exceptionally(ex -> handleError(ex))
    .orTimeout(5, TimeUnit.SECONDS);

// Thread pool configuration
ThreadPoolExecutor executor = new ThreadPoolExecutor(
    10, 50, 60L, TimeUnit.SECONDS,
    new ArrayBlockingQueue<>(1000),
    new ThreadPoolExecutor.CallerRunsPolicy()
);

// Lock with timeout
ReentrantLock lock = new ReentrantLock();
if (lock.tryLock(1, TimeUnit.SECONDS)) {
    try {
        // critical section
    } finally {
        lock.unlock();
    }
}

Thread Pool Sizing

Workload	Formula	Example
CPU-bound	cores	8 threads
I/O-bound	cores * (1 + wait/compute)	80 threads

Troubleshooting

Problem	Cause	Solution
Deadlock	Circular lock	Lock ordering, tryLock
Race condition	Missing sync	Add locks/atomics
Thread starvation	Unfair scheduling	Fair locks

Debug Commands

jstack -l <pid> > threaddump.txt
jcmd <pid> Thread.print

Usage

Skill("java-concurrency")

FAQ

What does the java-concurrency skill do?

Master Java concurrency - threads, executors, locks, CompletableFuture, virtual threads

How do I install java-concurrency?

Run npx skills add https://github.com/pluginagentmarketplace/custom-plugin-java --skill java-concurrency in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/java-concurrency/ (personal) or .claude/skills/java-concurrency/ (project).

Which AI agents can use java-concurrency?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is java-concurrency safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains java-concurrency?

It is published by pluginagentmarketplace in pluginagentmarketplace/custom-plugin-java. It has 466 recorded installs.

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java-concurrency

Install

Install

Describe the task

Review the result

SKILL.md

Java Concurrency Skill

Overview

When to Use This Skill

Topics Covered

Thread Management

Synchronization

Executors

CompletableFuture

Quick Reference

Thread Pool Sizing

Troubleshooting

Debug Commands

Usage

FAQ

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