75 semantic Java analysis tools via Eclipse JDT: navigation, refactoring, code intelligence.
Connect Runs on your machine
claude mcp add javalens -e JAVA_PROJECT_PATH=<JAVA_PROJECT_PATH> -e JAVALENS_TIMEOUT_SECONDS=<JAVALENS_TIMEOUT_SECONDS> -e JAVALENS_LOG_LEVEL=<JAVALENS_LOG_LEVEL> -- npx -y [email protected]{
"mcpServers": {
"javalens": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"JAVA_PROJECT_PATH": "<JAVA_PROJECT_PATH>",
"JAVALENS_TIMEOUT_SECONDS": "<JAVALENS_TIMEOUT_SECONDS>",
"JAVALENS_LOG_LEVEL": "<JAVALENS_LOG_LEVEL>"
}
}
}
}{
"mcpServers": {
"javalens": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"JAVA_PROJECT_PATH": "<JAVA_PROJECT_PATH>",
"JAVALENS_TIMEOUT_SECONDS": "<JAVALENS_TIMEOUT_SECONDS>",
"JAVALENS_LOG_LEVEL": "<JAVALENS_LOG_LEVEL>"
}
}
}
}{
"servers": {
"javalens": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"JAVA_PROJECT_PATH": "<JAVA_PROJECT_PATH>",
"JAVALENS_TIMEOUT_SECONDS": "<JAVALENS_TIMEOUT_SECONDS>",
"JAVALENS_LOG_LEVEL": "<JAVALENS_LOG_LEVEL>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
JAVA_PROJECT_PATHOptional | Auto-load project on startup |
JAVALENS_TIMEOUT_SECONDSOptional | Time limit on each tool call in seconds (5-300); unset means no limit |
JAVALENS_LOG_LEVELOptional | Log level: TRACE, DEBUG, INFO, WARN, ERROR |
Details
| Package | [email protected] (NPM, stdio) |
| First published | 18 Oct 2026 |
| Last updated | 18 Oct 2026 |
| Registry name | io.github.pzalutski-pixel/javalens |
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