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GraalVM Native Image

Overview

Helidon applications can be compiled into a native executable using the GraalVM native-image command.

When using applications created using the CLI, or when you configure Helidon application pom as a parent of your module, you can use the following steps to build a native image from your application:

  1. Create an environment variable GRAALVM_HOME pointing to your installation of GraalVM with native-image installed

  2. Run the Maven command mvn clean package -Pnative-image

  3. Execute the native executable created in the target directory of your project

Supported Modules

Some Helidon components are not (yet) supported in the native image, some have restrictions. The following table lists all Helidon features and their support for the native image.

Table 1. Helidon MP features in AOT
  Feature Component AOT note

✅

CDI

CDI

 

✅

Config

Config

 

✅

 

Encryption

 

✅

 

YAML

 

✅

Fault Tolerance

Fault Tolerance

 

✅

Health

Health

 

✅

 

Built-ins

 

✅

JAX-RS

JAX-RS

 

✅

JPA

JPA

 

❓

 

EclipseLink

Not yet tested.

🔶

 

Hibernate

Experimental support, tested on limited use cases with Helidon Oracle and H2 JDBC modules

🔶

JTA

JTA

Experimental support, tested on limited use cases

✅

Messaging

Messaging

 

✅

Metrics

Metrics

 

✅

Open API

Open API

 

🔶

REST Client

REST Client

Does not support execution of default methods on interfaces.

✅

Security

Security

 

✅

 

Integration: Jersey

 

✅

 

Integration: WebServer

 

✅

 

Integration: gRPC

 

✅

 

JWT Auth

 

✅

 

OIDC

 

✅

 

Provider: ABAC

 

✅

 

Provider/ABAC/Policy: EL

Requires reflection configuration for used classes.

✅

 

Provider/ABAC: Role

 

✅

 

Provider/ABAC: Scope

 

✅

 

Provider/ABAC: Time

 

❓

 

Provider: Google Login

Not yet tested.

✅

 

Provider: Header

 

✅

 

Provider: HTTP Basic

 

✅

 

Provider: HTTP Digest

 

✅

 

Provider: HTTP Signatures

 

❓

 

Provider: IDCS Role Mapper

Not yet tested.

✅

 

Provider: JWT

 

✅

Server

Server

 

✅

 

Access Log

 

✅

 

CORS

 

✅

Tracing

Tracing

 

✅

 

Integration: Jersey Server

 

✅

 

Integration: Jersey Client

 

✅

 

Jaeger

 

✅

 

Zipkin

 

✅

Web Client

Web Client

 

✅

 

Metrics

 

✅

 

Security

 

✅

 

Tracing

 

✅

 

Websocket

Server only.

✅

gRPC Server

gRPC Server

Since GraalVM 21.0.0

✅

 

Metrics

 

✅

gRPC Client

gRPC Client

Since GraalVM 21.0.0

✅

 

Metrics

 

✅

Scheduling

Scheduling

 

✅

OCI

OCI Integration

Modules with group id io.helidon.integrations.oci

✅

Vault

Hashicorp Vault Integration

 

✅

Long Running Actions

Client

 

✅

 

Coordinator

Only with external database