Graal Cloud Native (GCN) is a build of a curated
set of Micronaut®
framework modules and their required libraries for building portable cloud-native microservices that take
full advantage of
powerful cloud platform services and that can be compiled ahead-of-time by GraalVM Native Image.
GCN also provides project creation utilities and VS Code extensions for application development and
The GCN modules provide platform-independent support for a set of core cloud
services including object storage,
secret management, streaming, tracing, and more.
This guide walks you through the steps to successfully create, build,
test and deploy a cloud-native application to Oracle Cloud Infrastructure (OCI)
and Amazon Web Services (AWS).
We showcase these capabilities by building a Java application which accesses OCI Object Storage as well as Amazon S3 Object Storage.
You have a basic understanding of Java microservice frameworks such as Micronaut, Spring Boot, or
This guide describes how to create a Micronaut
application that runs natively on Oracle Cloud Infrastructure (OCI) and Amazon Web Services (AWS) without
any source code changes.
The application demonstrates how to store and retrieve user profile pictures in OCI and AWS Object Storage using
the Micronaut Object Storage API.
Create a new project using the following selections. (Alternatively, use these shortcuts for Maven
Project Type: Application (default)
Project name: GettingStarted
Base Package: com.example (default)
Language: Java (default)
Build Tool: Gradle (Groovy) or Maven
Test Framework: JUnit (default)
Java Version: 17 (default)
Micronaut Version: (default)
Cloud Services: Object Storage
Features: GraalVM Native Image (default)
Sample Code: Yes
Click Generate Project. The GCN Launcher creates an application with
the default package com.example in a directory named GettingStarted. The application ZIP
file will be downloaded to your default downloads directory. Unzip it, open it in Visual Studio (VS) Code, and
proceed to the next steps.
The GCN Launcher creates the following sample source code files that use the Micronaut
Object Storage API to create, read, and delete objects in the major cloud providers:
an interface describing the endpoints of the "profile pictures" microservice:
Using the OCI DevOps Resources in VS Code, you can easily deploy a Java application to OCI, make
source code changes, push them into the OCI Git repository, and then trigger the build of a container image with
your native executable or a container image with JVM using the predefined OCI Build Pipelines.
Develop Java applications in VS Code with Graal Cloud Native support. It offers help in the
form of relevant code completion suggestions when editing GCN specific configuration files.
Java language support speeds up development of Java code with hints, etc.
When developing database applications, the GCN tooling provides advanced database related
code completion for `find… ()` methods:
It offers the SQL code completion in @Query annotations among others, and so on.
GCN provides easy step-by-step guides, and companion sample applications, for the developer to learn how to use a specific cloud service (such as Micronaut Data). Browse the GCN site for list of modules and guides to learn more.