What is Java on Zerops? Zerops provides a fully managed Java runtime environment with automatic compilation, built-in Maven/Gradle support, and zero-config deployment. Build and deploy enterprise Java applications with reliability and performance.
Java is a high-level, class-based, object-oriented programming language designed to have as few implementation dependencies as possible. Learn more about Java → Key Features
Multiple Java Versions Support for Java 8, 11, 17, and 21 LTS versions
Automatic Scaling Horizontal and vertical auto-scaling based on resource usage
Build Tool Support Built-in Maven and Gradle support for dependency management
JVM Optimization Configurable JVM parameters for optimal performance
Supported Versions
Java 21 (Latest LTS)
Java 17 (LTS)
Java 11 (LTS)
Java 8 (Legacy LTS)
You can change the Java version at any time through the zerops.yaml configuration.
Quick Example project : name : my-java-app services : - hostname : app type : java@21 minContainers : 1 maxContainers : 3 buildFromGit : https://github.com/zeropsio/recipe-java-hello-world@main enableSubdomainAccess : true
Runtime Environment The Java runtime includes:
Alpine Linux or Ubuntu
OpenJDK (selected version)
Maven and Gradle
Git utilities
Zerops CLI tools
Common Use Cases
Deploy Spring Boot microservices and web applications. zerops : - setup : app build : base : java@21 buildCommands : - mvn clean package -DskipTests deployFiles : - target/*.jar run : start : java -jar target/app.jar
Run Jakarta EE applications on application servers. zerops : - setup : webapp build : base : java@17 buildCommands : - mvn clean package deployFiles : - target/*.war run : start : java -jar target/app.war
Microservices with Quarkus
Deploy cloud-native Java with Quarkus. zerops : - setup : service build : base : java@21 buildCommands : - ./mvnw package -Pnative deployFiles : - target/*-runner run : start : ./target/app-runner
Build Process Maven Build zerops : - setup : app build : base : java@21 buildCommands : - mvn clean install -DskipTests deployFiles : - target/*.jar cache : ~/.m2/repository
Gradle Build build : base : java@21 buildCommands : - gradle build -x test deployFiles : - build/libs/*.jar cache : ~/.gradle/caches
Runtime Configuration Standard JAR Execution run : start : java -jar app.jar ports : - port : 8080 httpSupport : true
With JVM Options run : start : java -Xmx512m -Xms256m -jar app.jar envVariables : JAVA_OPTS : "-Xmx512m -Xms256m"
Spring Boot Application run : start : java -jar app.jar --server.port=8080 envVariables : SPRING_PROFILES_ACTIVE : production
JVM Optimization Memory Configuration run : start : java -Xmx1g -Xms512m -XX:MaxMetaspaceSize=256m -jar app.jar
Garbage Collection run : start : java -XX:+UseG1GC -XX:MaxGCPauseMillis=200 -jar app.jar
Container-Aware JVM run : start : java -XX:+UseContainerSupport -XX:MaxRAMPercentage=75.0 -jar app.jar
Framework Examples Spring Boot zerops : - setup : api build : base : java@21 buildCommands : - mvn clean package -DskipTests deployFiles : - target/*.jar run : start : java -jar target/api-0.0.1-SNAPSHOT.jar envVariables : SPRING_PROFILES_ACTIVE : production
Quarkus zerops : - setup : app build : base : java@21 buildCommands : - ./mvnw package -Dquarkus.package.type=uber-jar deployFiles : - target/*-runner.jar run : start : java -jar target/app-runner.jar
Micronaut zerops : - setup : service build : base : java@21 buildCommands : - ./gradlew build -x test deployFiles : - build/libs/*-all.jar run : start : java -jar build/libs/app-all.jar
Database Integration PostgreSQL with JDBC import java.sql.Connection; import java.sql.DriverManager; public class Database { public static Connection getConnection () throws Exception { String url = String . format ( "jdbc:postgresql://db:5432/%s" , System . getenv ( "DB_NAME" ) ); return DriverManager . getConnection ( url, System . getenv ( "DB_USER" ), System . getenv ( "DB_PASSWORD" ) ); } }
Spring Data JPA run : envVariables : SPRING_DATASOURCE_URL : jdbc:postgresql://db:5432/${DB_NAME} SPRING_DATASOURCE_USERNAME : ${DB_USER} SPRING_DATASOURCE_PASSWORD : ${DB_PASSWORD}
Next Steps
Quickstart Guide Deploy your first Java application
Example Projects Explore Java examples on GitHub