1# Java
2
3Java language support in Zed is provided by:
4
5- Zed Java: [zed-extensions/java](https://github.com/zed-extensions/java)
6- Tree-sitter: [tree-sitter/tree-sitter-java](https://github.com/tree-sitter/tree-sitter-java)
7- Language Server: [eclipse-jdtls/eclipse.jdt.ls](https://github.com/eclipse-jdtls/eclipse.jdt.ls)
8
9## Install OpenJDK
10
11You will need to install a Java runtime (OpenJDK).
12
13- macOS: `brew install openjdk`
14- Ubuntu: `sudo add-apt-repository ppa:openjdk-23 && sudo apt-get install openjdk-23`
15- Windows: `choco install openjdk`
16- Arch Linux: `sudo pacman -S jre-openjdk-headless`
17
18Or manually download and install [OpenJDK 23](https://jdk.java.net/23/).
19
20## Extension Install
21
22You can install either by opening {#action zed::Extensions}({#kb zed::Extensions}) and searching for `java`.
23
24## Settings / Initialization Options
25
26The extension will automatically download the language server, see: [Manual JDTLS Install](#manual-jdts-install) below if you'd prefer to manage that yourself.
27
28For available `initialization_options` please see the [Initialize Request section of the Eclipse.jdt.ls Wiki](https://github.com/eclipse-jdtls/eclipse.jdt.ls/wiki/Running-the-JAVA-LS-server-from-the-command-line#initialize-request).
29
30You can add these customizations to your Zed Settings by launching {#action zed::OpenSettings}({#kb zed::OpenSettings}) or by using a `.zed/setting.json` inside your project.
31
32### Zed Java Settings
33
34```json [settings]
35{
36 "lsp": {
37 "jdtls": {
38 "initialization_options": {}
39 }
40 }
41}
42```
43
44## Example Configs
45
46### JDTLS Binary
47
48By default, zed will look in your `PATH` for a `jdtls` binary, if you wish to specify an explicit binary you can do so via settings:
49
50```json [settings]
51 "lsp": {
52 "jdtls": {
53 "binary": {
54 "path": "/path/to/java/bin/jdtls",
55 // "arguments": [],
56 // "env": {},
57 "ignore_system_version": true
58 }
59 }
60 }
61```
62
63### Zed Java Initialization Options
64
65There are also many more options you can pass directly to the language server, for example:
66
67```json [settings]
68{
69 "lsp": {
70 "jdtls": {
71 "initialization_options": {
72 "bundles": [],
73 "workspaceFolders": ["file:///home/snjeza/Project"],
74 "settings": {
75 "java": {
76 "home": "/usr/local/jdk-9.0.1",
77 "errors": {
78 "incompleteClasspath": {
79 "severity": "warning"
80 }
81 },
82 "configuration": {
83 "updateBuildConfiguration": "interactive",
84 "maven": {
85 "userSettings": null
86 }
87 },
88 "trace": {
89 "server": "verbose"
90 },
91 "import": {
92 "gradle": {
93 "enabled": true
94 },
95 "maven": {
96 "enabled": true
97 },
98 "exclusions": [
99 "**/node_modules/**",
100 "**/.metadata/**",
101 "**/archetype-resources/**",
102 "**/META-INF/maven/**",
103 "/**/test/**"
104 ]
105 },
106 "jdt": {
107 "ls": {
108 "lombokSupport": {
109 "enabled": false // Set this to true to enable lombok support
110 }
111 }
112 },
113 "referencesCodeLens": {
114 "enabled": false
115 },
116 "signatureHelp": {
117 "enabled": false
118 },
119 "implementationsCodeLens": {
120 "enabled": false
121 },
122 "format": {
123 "enabled": true
124 },
125 "saveActions": {
126 "organizeImports": false
127 },
128 "contentProvider": {
129 "preferred": null
130 },
131 "autobuild": {
132 "enabled": false
133 },
134 "completion": {
135 "favoriteStaticMembers": [
136 "org.junit.Assert.*",
137 "org.junit.Assume.*",
138 "org.junit.jupiter.api.Assertions.*",
139 "org.junit.jupiter.api.Assumptions.*",
140 "org.junit.jupiter.api.DynamicContainer.*",
141 "org.junit.jupiter.api.DynamicTest.*"
142 ],
143 "importOrder": ["java", "javax", "com", "org"]
144 }
145 }
146 }
147 }
148 }
149 }
150}
151```
152
153## Manual JDTLS Install
154
155If you prefer, you can install JDTLS yourself and the extension can be configured to use that instead.
156
157- macOS: `brew install jdtls`
158- Arch: [`jdtls` from AUR](https://aur.archlinux.org/packages/jdtls)
159
160Or manually download install:
161
162- [JDTLS Milestone Builds](http://download.eclipse.org/jdtls/milestones/) (updated every two weeks)
163- [JDTLS Snapshot Builds](https://download.eclipse.org/jdtls/snapshots/) (frequent updates)
164
165## See also
166
167- [Zed Java Repo](https://github.com/zed-extensions/java)
168- [Zed Java Issues](https://github.com/zed-extensions/java/issues)