Java IDE Environment

Enterprise Java development with OpenJDK 17, Spring Boot, Maven, and Gradle.

What's Inside

Tool	Version	Purpose
Java	OpenJDK 17	Runtime and compiler
Maven	Latest	Build and dependency management
Gradle	Latest	Alternative build tool
Spring Boot	Ready	Web framework (via scaffolding)

Quick Start

# Compile and run a single file
java-run Main.java

# Build and run a Maven project
java-run

# Run tests
java-test

# Scaffold a Spring Boot project
java-spring my-app

# Scaffold a plain Maven project
java-init my-app

Helper Commands

Command	What it does
`java-run`	Build + run (auto-detects Maven or Gradle)
`java-run Main.java`	Compile + run a single Java file
`java-test`	Run tests (auto-detects Maven or Gradle)
`java-spring <name>`	Scaffold a Spring Boot project with REST API
`java-init <name>`	Scaffold a plain Maven project
`java-help`	Show all available commands

Spring Boot Scaffolding

Running java-spring my-app creates:

my-app/
├── pom.xml                          # Spring Boot, JPA, Validation, H2
├── src/main/java/com/learncen/
│   ├── Application.java             # Spring Boot entry point
│   ├── model/Product.java           # JPA entity
│   ├── repository/ProductRepository.java
│   ├── service/ProductService.java
│   └── controller/ProductController.java  # REST API
├── src/main/resources/
│   ├── application.properties       # H2 database config
│   └── data.sql                     # Seed data
└── src/test/java/
    └── ProductControllerTest.java   # MockMvc integration tests

Start it with:

cd my-app
java-run
# API available at http://localhost:8080/api/products

Tips

java-run auto-detects whether you're in a Maven or Gradle project
For single files, just java-run Main.java — no project setup needed
JVM memory is auto-tuned: 75% of pod limit (MaxRAMPercentage), 50% initial
Ctrl+Shift+B builds and runs the current project

Security

Root access is restricted. Use sudo apt install <package> for system packages.
Java, Maven, and Gradle are whitelisted for sudo access.
JVM respects Kubernetes pod CPU and memory limits automatically.