Java

There are two extensions that provide Java language support for Zed:

Both use:

Install OpenJDK

You will need to install a Java runtime (OpenJDK).

  • MacOS: brew install openjdk
  • Ubuntu: sudo add-apt-repository ppa:openjdk-23 && sudo apt-get install openjdk-23
  • Windows: choco install openjdk
  • Arch Linux: sudo pacman -S jre-openjdk-headless

Or manually download and install OpenJDK 23.

Extension Install

You can install either by opening zed: extensions(cmd-shift-x|ctrl-shift-x) and searching for java.

We recommend you install one or the other and not both.

Settings / Initialization Options

Both extensions will automatically download the language server, see: Manual JDTLS Install below if you'd prefer to manage that yourself.

For available initialization_options please see the Initialize Request section of the Eclipse.jdt.ls Wiki.

You can add these customizations to your Zed Settings by launching zed: open settings(cmd-,|ctrl-,) or by using a .zed/setting.json inside your project.

Zed Java Settings

{
  "lsp": {
    "jdtls": {
      "settings": {
        "version": "1.40.0", // jdtls version to download and use
        "classpath": "/path/to/classes.jar:/path/to/more/classes/"
      },
      "initialization_options": {}
    }
  }
}

Java with Eclipse JDTLS settings

{
  "lsp": {
    "java": {
      "settings": {},
      "initialization_options": {}
    }
  }
}

Example Configs

Zed Java Initialization Options

There are also many more options you can pass directly to the language server, for example:

{
  "lsp": {
    "jdtls": {
      "initialization_options": {
        "bundles": [],
        "workspaceFolders": ["file:///home/snjeza/Project"],
        "settings": {
          "java": {
            "home": "/usr/local/jdk-9.0.1",
            "errors": {
              "incompleteClasspath": {
                "severity": "warning"
              }
            },
            "configuration": {
              "updateBuildConfiguration": "interactive",
              "maven": {
                "userSettings": null
              }
            },
            "trace": {
              "server": "verbose"
            },
            "import": {
              "gradle": {
                "enabled": true
              },
              "maven": {
                "enabled": true
              },
              "exclusions": [
                "**/node_modules/**",
                "**/.metadata/**",
                "**/archetype-resources/**",
                "**/META-INF/maven/**",
                "/**/test/**"
              ]
            },
            "referencesCodeLens": {
              "enabled": false
            },
            "signatureHelp": {
              "enabled": false
            },
            "implementationsCodeLens": {
              "enabled": false
            },
            "format": {
              "enabled": true
            },
            "saveActions": {
              "organizeImports": false
            },
            "contentProvider": {
              "preferred": null
            },
            "autobuild": {
              "enabled": false
            },
            "completion": {
              "favoriteStaticMembers": [
                "org.junit.Assert.*",
                "org.junit.Assume.*",
                "org.junit.jupiter.api.Assertions.*",
                "org.junit.jupiter.api.Assumptions.*",
                "org.junit.jupiter.api.DynamicContainer.*",
                "org.junit.jupiter.api.DynamicTest.*"
              ],
              "importOrder": ["java", "javax", "com", "org"]
            }
          }
        }
      }
    }
  }
}

Java with Eclipse JTDLS Configuration

Configuration options match those provided in the redhat-developer/vscode-java extension.

For example, to enable Lombok Support:

{
  "lsp": {
    "java": {
      "settings": {
        "java.jdt.ls.lombokSupport.enabled:": true
      }
    }
  }
}

Manual JDTLS Install

If you prefer, you can install JDTLS yourself and both extensions can be configured to use that instead.

Or manually download install:

See also

Support

If you have issues with either of these plugins, please open issues on their respective repositories: