Write, compile, run, and debug Java enterprise applications directly in your browser. Complete with Maven and Gradle project detection, Monaco code intelligence, DAP stepping, and JUnit 5 test execution.
No local JDK configuration, no classpath headaches. Open a project and begin coding instantly.
Backed by Eclipse JDT Language Server (jdtls) for real-time compilation error diagnostics, smart auto-imports, symbol renames, method override generation, and type hierarchy inspection.
Native detection of pom.xml and build.gradle files. Execute standard build goals, download remote Maven Central dependencies, and compile multi-module projects.
./mvnw, ./gradlew)build.xml legacy supportIntegrated test discovery and execution for JUnit Jupiter, JUnit 4, and TestNG. View structured test trees, individual assertions, execution timings, and jump to failing stack lines.
Connect to the Java runtime via the Debug Adapter Protocol. Pause at line breakpoints, inspect object hierarchies, watch expressions, and step through recursive calls.
Leverage autonomous AI assistance trained on modern Java paradigms. Generate idiomatic streams, refactor monolithic methods, write unit tests, and resolve compilation errors.
Full terminal access with Java development kit binaries pre-installed (javac, java, mvn, gradle, git). Run custom CLI commands and inspect logs in real time.
Experience real-time execution of modern Java 21 syntax with clean build output.
package com.example;
import java.time.Duration;
import java.util.concurrent.Executors;
import java.util.stream.IntStream;
public class ConcurrentService {
public static void main(String[] args) {
System.out.println("Executing with Java 21 Virtual Threads in OnlineAIIDE...");
// Launch 1,000 lightweight virtual threads simultaneously
try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
IntStream.range(0, 1000).forEach(i -> executor.submit(() -> {
Thread.sleep(Duration.ofMillis(10));
return i;
}));
}
System.out.println("SUCCESS: All 1,000 virtual thread tasks completed in cloud sandbox.");
}
}Pre-configured versions and environment details in OnlineAIIDE.
| Component | Supported Version | Features Included |
|---|---|---|
| JDK Runtime | OpenJDK 17 LTS, OpenJDK 21 LTS | Virtual Threads, Pattern Matching, Records, Foreign Function & Memory API |
| Build Tools | Apache Maven 3.9+, Gradle 8.5+, Ant 1.10+ | Multi-module build support, POM dependency resolver, Gradle daemon |
| Language Server | Eclipse JDT Language Server (jdtls) | Hover docs, Go-to Definition, Auto-Imports, Semantic Highlighting |
| Testing Frameworks | JUnit 5.10+, JUnit 4.13+, TestNG 7+ | Surefire XML parser, assertion diffs, direct source jump |
| Debugging | DAP (Debug Adapter Protocol) | Line breakpoints, conditional breakpoints, variable watches |
Frequently asked questions about Java development on OnlineAIIDE.
./mvnw spring-boot:run, test REST endpoints, and debug beans interactively. See our Online Spring Boot IDE guide for dedicated details.
pom.xml, the language server and Maven background worker resolve and fetch the required JAR artifacts from Maven Central into your cloud workspace classpath automatically.