*nvim-java.txt* For Neovim >= 0.9.4 Last change: 2025 December 03

Table of Contents *nvim-java-table-of-contents*

1. nvim-java |nvim-java-nvim-java|

- Demo |nvim-java-demo|

- Features |nvim-java-features|

- How to Install |nvim-java-how-to-install|

- Commands |nvim-java-commands|

- APIs |nvim-java-apis|

- How to Use JDK X.X Version? |nvim-java-how-to-use-jdk-x.x-version?|

- Configuration |nvim-java-configuration|

- Architecture |nvim-java-architecture|

- Projects Acknowledgement |nvim-java-projects-acknowledgement|

2. Links |nvim-java-links|

1. nvim-java *nvim-java-nvim-java*

Just install and start writing `public static void main(String[] args)`.

[!TIP] You can find cool tips & tricks here

https://github.com/nvim-java/nvim-java/wiki/Tips-&-Tricks

DEMO *nvim-java-demo*

<https://github.com/nvim-java/nvim-java/assets/18459807/047c8c46-9a0a-4869-b342-d5c2e15647bc>

FEATURES *nvim-java-features*

- Spring Boot Tools

- Diagnostics & Auto Completion

- Automatic Debug Configuration

- Organize Imports & Code Formatting

- Running Tests

- Run & Debug Profiles

- Built-in Application Runner with Log Viewer

- Profile Management UI

- Decompiler Support

- Code Actions <https://github.com/nvim-java/nvim-java/wiki/Tips-&-Tricks#running-code-actions>

HOW TO INSTALL *nvim-java-how-to-install*

**Requirements:** Neovim 0.11+

>lua

vim.pack.add({

{

src = 'https://github.com/JavaHello/spring-boot.nvim',

version = '218c0c26c14d99feca778e4d13f5ec3e8b1b60f0',

},

'https://github.com/MunifTanjim/nui.nvim',

'https://github.com/mfussenegger/nvim-dap',

'https://github.com/nvim-java/nvim-java',

})

require('java').setup()

vim.lsp.enable('jdtls')

<

Install using lazy.nvim <https://github.com/folke/lazy.nvim>:

>lua

{

'nvim-java/nvim-java',

config = function()

require('java').setup()

vim.lsp.enable('jdtls')

end,

}

<

Yep! That’s all :)

COMMANDS *nvim-java-commands*

- `JavaBuildBuildWorkspace` - Runs a full workspace build

- `JavaBuildCleanWorkspace` - Clear the workspace cache (for now you have to

close and reopen to restart the language server after the deletion)

- `JavaRunnerRunMain` - Runs the application or selected main class (if there

are multiple main classes)

>vim

:JavaRunnerRunMain

:JavaRunnerRunMain <arguments> <to> <pass>

<

- `JavaRunnerStopMain` - Stops the running application

- `JavaRunnerToggleLogs` - Toggle between show & hide runner log window

- `JavaDapConfig` - DAP is autoconfigured on start up, but in case you want to

force configure it again, you can use this API

- `JavaTestRunCurrentClass` - Run the test class in the active buffer

- `JavaTestDebugCurrentClass` - Debug the test class in the active buffer

- `JavaTestRunCurrentMethod` - Run the test method on the cursor

- `JavaTestDebugCurrentMethod` - Debug the test method on the cursor

- `JavaTestViewLastReport` - Open the last test report in a popup window

- `JavaProfile` - Opens the profiles UI

- `JavaRefactorExtractVariable` - Create a variable from value at cursor/selection

- `JavaRefactorExtractVariableAllOccurrence` - Create a variable for all

occurrences from value at cursor/selection

- `JavaRefactorExtractConstant` - Create a constant from the value at cursor/selection

- `JavaRefactorExtractMethod` - Create a method from the value at cursor/selection

- `JavaRefactorExtractField` - Create a field from the value at cursor/selection

- `JavaSettingsChangeRuntime` - Change the JDK version to another

APIS *nvim-java-apis*

- `build.build_workspace` - Runs a full workspace build

>lua

require('java').build.build_workspace()

<

- `build.clean_workspace` - Clear the workspace cache

(for now you have to close and reopen to restart the language server after

the deletion)

>lua

require('java').build.clean_workspace()

<

- `built_in.run_app` - Runs the application or selected main class (if there

are multiple main classes)

>lua

require('java').runner.built_in.run_app({})

require('java').runner.built_in.run_app({'arguments', 'to', 'pass', 'to', 'main'})

<

- `built_in.stop_app` - Stops the running application

>lua

require('java').runner.built_in.stop_app()

<

- `built_in.toggle_logs` - Toggle between show & hide runner log window

>lua

require('java').runner.built_in.toggle_logs()

<

- `config_dap` - DAP is autoconfigured on start up, but in case you want to force

configure it again, you can use this API

>lua

require('java').dap.config_dap()

<

- `run_current_class` - Run the test class in the active buffer

>lua

require('java').test.run_current_class()

<

- `debug_current_class` - Debug the test class in the active buffer

>lua

require('java').test.debug_current_class()

<

- `run_current_method` - Run the test method on the cursor

>lua

require('java').test.run_current_method()

<

- `debug_current_method` - Debug the test method on the cursor

>lua

require('java').test.debug_current_method()

<

- `view_report` - Open the last test report in a popup window

>lua

require('java').test.view_last_report()

<

>lua

require('java').profile.ui()

<

- `extract_variable` - Create a variable from value at cursor/selection

>lua

require('java').refactor.extract_variable()

<

- `extract_variable_all_occurrence` - Create a variable for all occurrences from

value at cursor/selection

>lua

require('java').refactor.extract_variable_all_occurrence()

<

- `extract_constant` - Create a constant from the value at cursor/selection

>lua

require('java').refactor.extract_constant()

<

- `extract_method` - Create method from the value at cursor/selection

>lua

require('java').refactor.extract_method()

<

- `extract_field` - Create a field from the value at cursor/selection

>lua

require('java').refactor.extract_field()

<

- `change_runtime` - Change the JDK version to another

>lua

require('java').settings.change_runtime()

<

HOW TO USE JDK X.X VERSION? *nvim-java-how-to-use-jdk-x.x-version?*

Use `vim.lsp.config()` to override the default JDTLS settings:

>lua

vim.lsp.config('jdtls', {

default_config = {

settings = {

java = {

configuration = {

runtimes = {

{

name = "JavaSE-21",

path = "/opt/jdk-21",

default = true,

}

}

}

}

}

}

})

<

CONFIGURATION *nvim-java-configuration*

For most users changing the default configuration is not necessary. But if you

want, following options are available:

>lua

require('java').setup({

-- Startup checks

checks = {

nvim_version = true, -- Check Neovim version

nvim_jdtls_conflict = true, -- Check for nvim-jdtls conflict

},

-- JDTLS configuration

jdtls = {

version = '1.43.0',

},

-- Extensions

lombok = {

enable = true,

version = '1.18.40',

},

java_test = {

enable = true,

version = '0.40.1',

},

java_debug_adapter = {

enable = true,

version = '0.58.2',

},

spring_boot_tools = {

enable = true,

version = '1.55.1',

},

-- JDK installation

jdk = {

auto_install = true,

version = '17',

},

-- Logging

log = {

use_console = true,

use_file = true,

level = 'info',

log_file = vim.fn.stdpath('state') .. '/nvim-java.log',

max_lines = 1000,

show_location = false,

},

})

<

ARCHITECTURE *nvim-java-architecture*

Following is the high level idea. Jdtls is the language server nvim-java

communicates with. However, we don’t have all the features we need just in

Jdtls. So, we are loading java-test & java-debug-adapter extensions when we

launch Jdtls. Once the language server is started, we communicate with the

language server to do stuff.

For instance, to run the current test,

- Request Jdtls for test classes

- Request Jdtls for class paths, module paths, java executable

- Request Jdtls to start a debug session and send the port of the session back

- Prepare TCP connections to listen to the test results

- Start nvim-dap and let user interactions to be handled by nvim-dap

- Parse the test results as they come in

- Once the execution is done, open a window show the test results

>text

┌────────────┐ ┌────────────┐

│ │ │ │

│ Neovim │ │ VSCode │

│ │ │ │

└─────▲──────┘ └──────▲─────┘

│ │

│ │

│ │

│ │

┌───────▼───────┐ ┌──────────────▼──────────────┐

│ │ │ │

│ nvim-java │ │ Extension Pack for Java │

│ │ │ │

└───────▲───────┘ └──────────────▲──────────────┘

│ │

│ │

│ │

│ │

│ │

│ ┌───────────┐ │

│ │ │ │

└──────────────► JDTLS ◄────────────┘

│ │

└───▲───▲───┘

│ │

│ │

│ │

│ │

│ │

┌───────────────┐ │ │ ┌────────────────────────┐

│ │ │ │ │ │

│ java-test ◄────────┘ └─────────► java-debug-adapter │

│ │ │ │

└───────────────┘ └────────────────────────┘

<

PROJECTS ACKNOWLEDGEMENT *nvim-java-projects-acknowledgement*

- spring-boot.nvim <https://github.com/JavaHello/spring-boot.nvim> is the one

that starts sts4 & do other necessary `jdtls` `sts4` sync command registration

in `nvim-java`.

- nvim-jdtls <https://github.com/mfussenegger/nvim-jdtls> is a plugin that

follows "Keep it simple, stupid!" approach. If you love customizing things by

yourself, then give nvim-jdtls a try.

2. Links *nvim-java-links*

1. *Spring*: https://img.shields.io/badge/Spring-6DB33F?style=for-the-badge&logo=spring&logoColor=white

2. *Java*: https://img.shields.io/badge/java-%23ED8B00.svg?style=for-the-badge&logo=openjdk&logoColor=white

3. *Gradle*: https://img.shields.io/badge/Gradle-02303A.svg?style=for-the-badge&logo=Gradle&logoColor=white

4. *Apache Maven*: https://img.shields.io/badge/Apache%20Maven-C71A36?style=for-the-badge&logo=Apache%20Maven&logoColor=white

5. *Neovim*: https://img.shields.io/badge/NeoVim-%2357A143.svg?&style=for-the-badge&logo=neovim&logoColor=white

6. *Lua*: https://img.shields.io/badge/lua-%232C2D72.svg?style=for-the-badge&logo=lua&logoColor=white

7. *Linux*: https://img.shields.io/badge/Linux-FCC624?style=for-the-badge&logo=linux&logoColor=black

8. *Windows*: https://img.shields.io/badge/Windows-0078D6?style=for-the-badge&logo=windows11&logoColor=white

9. *macOS*: https://img.shields.io/badge/macOS-000000?style=for-the-badge&logo=apple&logoColor=white

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