Jj Lsp

aheritier/boost-your-ai

9 repo stars
Updated March 19, 2026
aheritier/boost-your-ai

Get lightweight Java code intelligence via the jj-language-server without requiring a JVM.

About

Jj-lsp provides a Java language server (jj-language-server) for lightweight code intelligence without requiring a JVM. It brings completion and analysis to Java development with minimal runtime overhead.

Java language server
No JVM required
Lightweight code intelligence
jj-language-server

Jj Lsp by the numbers

Data as of Jul 7, 2026 (Skillselion catalog sync)

/plugin marketplace add aheritier/boost-your-ai

/plugin install jj-lsp@boost-your-ai

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repo stars	★ 9
Last updated	March 19, 2026
Repository	aheritier/boost-your-ai ↗

What it does

Get lightweight Java code intelligence via the jj-language-server without requiring a JVM.

README.md

jj-lsp

Java language server plugin powered by jj-language-server — a lightweight, JVM-free alternative to Eclipse JDT.LS.

Prerequisites

Node.js >= 20 (no Java runtime required)

Installation

1. Install jj-language-server

npm install -g jj-language-server

2. Add the marketplace and install the plugin

/plugin marketplace add aheritier/boost-your-ai
/plugin install jj-lsp@boost-your-ai

3. Restart Claude Code

The Java LSP will activate automatically for .java files.

Supported Files

.java

Features

Feature	Supported
Go to definition	✅
Find references	✅
Auto-completion	✅
Diagnostics	✅
Code formatting	✅
Rename symbol	✅
Code actions	✅
Semantic tokens	✅
Maven support	✅
Gradle support	✅
Lombok support	✅
Spring Boot support	✅

Performance vs Eclipse JDT.LS

Metric	jj-language-server	Eclipse JDT.LS	Improvement
Startup time	~274ms	~2,500ms	~9x faster
Memory usage	~130MB	~980MB	~7.5x less
JVM required	No	Yes	—
Node.js needed	Yes (>= 20)	No	—

Note: One Java LSP at a Time

If you have the jdtls-lsp plugin installed, only activate one Java LSP at a time to avoid conflicts. Use either jj-lsp or jdtls-lsp, not both simultaneously.