Do I need to install Maven or Gradle on the server?

No. Build locally and upload the packaged .jar . Square runs it directly with JDK 25.

Can I run Kotlin, Scala, or Clojure?

Yes. Any JVM language packaged as fat JAR works — Kotlin, Scala, Clojure, Groovy.

How do I configure JVM flags?

Use the START= field in squarecloud.app . Example: START=java -Xms256m -Xmx900m -jar app.jar .

Can I host a Lavalink server?

Yes. Upload Lavalink.jar and configure START= with the right flags (e.g., java -Xmx512m -jar Lavalink.jar ). Ideal for Discord music bots that need standalone audio processing, YouTube/SoundCloud/Spotify support, and WebSocket connectivity.

JDK 25 with no setup

Host your .jar in seconds. Ready environment with OpenJDK 25 — ideal for Spring Boot, Quarkus, and Micronaut.

Get started See plans

Why run on Square Cloud

Everything optimized, production-ready.

Modern JDK 25

Virtual threads, pattern matching, ZGC — all the latest features.

Upload your JAR directly

No Maven/Gradle on the server — build locally, Square runs it.

Kotlin, Scala, Clojure, Groovy

Any JVM language packaged as fat JAR works.

Customizable JVM

Configure flags via START= (e.g. java -Xms256m -Xmx900m -jar app.jar).

Ideal use cases

Where this runtime shines on our platform.

Spring Boot and Quarkus APIs

REST, GraphQL, and gRPC with virtual threads, low latency, and optimized startup.

Java Discord bots

24/7 hosting for JDA, Discord4J, and Javacord bots in isolated containers.

JVM microservices in production

Typed communication with gRPC, Protobuf, and async messaging at enterprise scale.

Server-side Kotlin applications

Modern backends with Ktor, Spring + Kotlin, and coroutines-first architecture in production.

Lavalink servers for music bots

Standalone Lavalink with YouTube, SoundCloud, and Spotify support, connecting Discord bots via WebSocket.

Enterprise batch processing

Spring Batch, Quartz Scheduler jobs, and ETL data pipelines on robust JVM environments.

Available versions

Pick the track that best fits your project.

Current version

Single stable toolchain

Technical specs

Everything you need to configure your app.

Accepted extensions: .jarpom.xmlbuild.gradlebuild.gradle.kts
Dependency file: Not required
RUNTIME= aliases: java

Minimal config

Create a squarecloud.app file at your project root:

squarecloud.appJava

MEMORY=512
DISPLAY_NAME=Meu App
VERSION=recommended
MAIN=app.jar

Frequently asked questions about Java Hosting

JDK 25, fat JAR, Spring Boot, and Lavalink servers.

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