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Below are the common issues ordered by the most important to specific ones:

Server is not initializing#

Make sure you have the most recent version of clojure-lsp

Check if the executable is working running it from the command line, it should start up and start reading from stdin. Type {}\n\n and you should get something like:

$ clojure-lsp

Apr 12, 2019 7:07:02 AM org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer fireError
SEVERE: Missing header Content-Length in input "{}

java.lang.IllegalStateException: Missing header Content-Length in input "{}""""


If that is ok, clojure-lsp logs to /tmp/clojure-lsp.*.out, so watch that file and start your editor.

LSP Clients also generally have a way to trace server interactions. Turn that on and attach both server and client logs to an issue if it's not obvious what's going on.

For example, if you are using neovim with CoC, first ensure that trace.server is set to verbose in your coc-settings.json file, e.g.,

  "languageserver": {
    "clojure-lsp": {
      "command": "clojure-lsp",
      "filetypes": ["clojure"],
      "disableDiagnostics": false,
      "rootPatterns": ["deps.edn", "project.clj"],
      "additionalSchemes": ["jar", "zipfile"],
      "trace.server": "verbose",
      "initializationOptions": {
        "project-specs": [{
          "project-path": "deps.edn",
          "classpath-cmd": ["clj", "-Spath"]
        "use-metadata-for-privacy?": true,
        "ignore-classpath-directories": true

Then, once vim has loaded (and clojure-lsp has initialised), you can issue this command:

:CocCommand workspace.showOutput

This will show the JSON request/response bodies that go between vim and clojure-lsp. Please capture that information if you need help in tracking down the problem you are experiencing (either by reporting github issues, or talking with someone in Slack/Discord or whatever...)

Some features are not working#

clojure-lsp uses clj-kondo to scan the classpath during server initialize for most features work, so make sure you don't see any "Error while looking up classpath..." on clojure-lsp log file.

Please note that clojure-lsp comes bundled with clj-kondo, so you do not have to install it separately.

Classpath scan error#

By default clojure-lsp knows how to scan most common clojure projects using the following rules:

  • If the project root has a project.clj file, it'll run lein classpath to get the classpath.
  • If the project root has a deps.edn file, it'll run clojure -Spath to get the classpath.
  • If the project root has a build.boot file, it'll run boot show --fake-classpath to get the classpath.
  • If the project root has a shadow-cljs.edn file, it'll run npx shadow-cljs classpath to get the classpath.

If your project doesn't follow the above rules or you need a custom command to get the classpath you need to configure the project-specs clojure-lsp setting, for more details check thesettings section.

Folders not being analyzed#

By default clojure-lsp searches src and test for clj* files to read into an index. If the definition lives under a different source dir, you can define the src-paths setting, for more details check the settings section.

It is also important to get your project-root correct in your client otherwise the source paths will not be found, check the project-root via your LSP client.

Wrong diagnostics/lint#

  • clojure-lsp persist the external jars analysis in a .lsp/sqlite.db file, if you have issues with some specific feature, try to remove that file and restart the server.
  • clojure-lsp use clj-kondo to lint and cache in a .clj-kondo/.cache dir, try to remove that file as well if you think it's not linting correctly
  • If you have issues with macros, double check your clj-kondo config.

Missing Add require... on code actions when using CoC and (neo)vim#

If you find, when executing the command (coc-codeaction-line) (or (coc-codeaction-selected) or (coc-codeaction-cursor)), that you aren't getting back all of the code actions you might expect, please ensure that you have, in your coc-settings.json the line disableDiagnostics set to false or better yet, don't have the line there at all :-)


In some version of MacOS, Apple restrict the binary to run, to fix that run: xattr -d /path/to/clojure-lsp

Last update: June 21, 2021