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# Java Development Environment
A simple Nix Flake providing a reproducible Java development environment.
## Included Tools
* **JDK 21** – Java compiler and runtime
* **Maven** – Dependency management and project build tool
* **Gradle** – Alternative build system
* **JDT Language Server** – Language server used by many editors (Neovim, VS Code, Helix, etc.)
## Usage
Enter the development shell:
```bash
nix develop
```
When the shell starts, it will display the installed Java version and create an `out/` directory for compiled classes if it doesn't already exist.
## Helper Commands
The shell provides a few convenience aliases for small Java projects.
### `jbuild`
Compiles every Java source file under `src/` into the `out/` directory.
```bash
jbuild
```
Equivalent to:
```bash
find src -name "*.java" | xargs javac -d out
```
---
### `jrun`
Builds the project and runs:
```text
src.Main
```
```bash
jrun
```
This assumes your application's entry point is `src.Main`.
---
### `jclean`
Removes compiled output.
```bash
jclean
```
## Project Layout
This template assumes a simple project structure:
```text
.
├── flake.nix
├── src/
│ └── Main.java
└── out/
```
For larger projects, consider using Maven or Gradle instead of the helper aliases.
## Customization
This template is intended as a starting point. You can easily modify it to:
* use a different JDK version
* add testing frameworks (JUnit, TestNG)
* include formatting and linting tools
* add debugging utilities
* add database or web development dependencies
Because everything is defined in the flake, the development environment remains reproducible across Linux, macOS, and other supported platforms.
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