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Eclipse LSP4J

Monday, July 18, 2016 - 04:36 by Sven Efftinge
This proposal is in the Project Proposal Phase (as defined in the Eclipse Development Process) and is written to declare its intent and scope. We solicit additional participation and input from the community. Please login and add your feedback in the comments section.
Parent Project
Proposal State

The Language Server Protocol currently defined by the VSCode team at [1] is an effort to unify communication between editors (tools) and advanced language tooling.

[1] -



This project aims at providing a reusable Java implementation of VSCode's language server protocol. It implements the types as well as the communication, including serialization to and deserialization from JSON.


LSP4J is a Java implementation of VSCode's language server protocol intended to be consumed by tools and language servers implemented in Java.

Why Here?

The Eclipse Foundation is a trusted open source foundation and hosts a number of potential clients of this project, such as (Eclipse Platform, JDT, Xtext, JSDT, etc.)

Project Scheduling

We intend to provide a first incubation release shortly after project creation.

Future Work

It is planned to keep up with the evolution of the language server protocol.

Anton Kosyakov
Jan Koehnlein
Evgen Vidolob
Interested Parties
Initial Contribution

The initial contribution is currently hosted at

Source Repository Type