1. Project Helidon Introduction
Confidential – Oracle Internal/Restricted/Highly Restricted
Project Helidon Introduction
Java Libraries for Microservices
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Joe Di Pol
Romain Grécourt
Oracle
Oct 24, 2018

2. Safe Harbor Statement
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3. Agenda 1
Helidon Overview Demo 2

4. A set of Java libraries for developing microservices.

5. Microframework
Functional style
Reactive
Transparent
MicroProfile
Declarative style
CDI, JAX-RS, JSON-P
Familiar to Java EE devs

6. Java Microservice Frameworks
Larger
Full-Stack
Spring Boot
Dropwizard
What Java Frameworks are out there for writing microservices? They fall into a few categories:
Microframeworks
Simple, fun, intentionally small feature set
Spark, Javalin, Micronaut, etc
MicroProfile
Friendly to Java EE developers. A bit heavier (CDI)
Thorntail (was Wildfly Swarm), OpenLiberty, Payara
Full Featured
Fuller feature set, more to learn
Spring Boot
And some float in between: DropWizard
Helidon is a MicroProfile implementation on top of Helidon Core – a microframework. So you get your choice of programing models:
Helidon Core: simple, functional, lightweight. For those that want a microframework.
MicroProfile; JAX-RS, CDI, plus more. Familiar to Java EE developers
MicroProfile Based
Open Liberty
Microframeworks
Smaller

7. Helidon Architecture Helidon SE Helidon MP Netty Simple Transparent
No classloading tricks
No packaging tricks
Just a Java SE application
CDI
JAX-RS
JSON-P
WebServer
Config
Security
Netty

8. What is Eclipse MicroProfile?
Proposed in 2016 as a microservices profile for Java EE
Initiated by RedHat, IBM, Tomitribe and Payara
Defines a profile for microservices
Key Java EE APIs + new MicroProfile APIs
Implemented by multiple vendors
Currently at 2.1:
JAX-RS, CDI, JSON-P, JSON-B
MP Config, Metrics, Health Check, Fault Tolerance, JWT Auth
Open API, OpenTracing, RestClient
1.x: JAX-RS 2.0, CDI 1.2, JSON-P 1.0
1.4: Config 1.3, Fault tolerance 1.1, Health Check 1.0, Metrics 1.1, JWT Auth 1.1, OpenAPI 1.0, OpenTracing 1.1, Rest Client 1.1
1.3: Config 1.2, Fault tolerance 1.0, Health Check 1.0, Metrics 1.1, JWT Auth 1.0, OpenAPI 1.0, OpenTracing 1.0, Rest Client 1.0
1.2: Config 1.1, Fault tolerance 1.0, Health Check 1.0, Metrics 1.0, JWT Auth 1.0
2.x: CDI 2.0, JAX-RS 2.1, JSON-B 1.0, JSON-P 1.1, Common Annotations 1.3
2.0: Config 1.3, Fault tolerance 1.1, Health Check 1.0, Metrics 1.1, JWT Auth 1.1, OpenAPI 1.0, OpenTracing 1.1, Rest Client 1.1
2.1: Config 1.3, Fault tolerance 1.1, Health Check 1.0, Metrics 1.1, JWT Auth 1.1, OpenAPI 1.0, OpenTracing 1.2, Rest Client 1.1
Helidon:
CDI 2.0, JAX-RS 2.1, JSON-P 1.1.2
0.10.2: Config 1.2.1, Fault tolerance 1.0, Health Check 1.0, Metrics 1.1, JWT Auth 1.1, OpenAPI 1.0, OpenTracing 1.1, Rest Client 1.1

9. What is Helidon SE? Reactive WebServer
Functional routing model with reactive Flow API
Built on Netty
OpenTracing and Metrics
JAX-RS, JSON-P support
Static content support
Config
Flexible, typed config model
Multiple data sources
Hierarchical model
Dynamic updates
Extensible
Security
Authentication
Authorization
Outbound Security
Auditing
Extensible
Built-in Providers
OIDC
JWT
Google Login

10. Hello Worlds Helidon SE Helidon MP
import io.helidon.webserver.Routing;
import io.helidon.webserver.WebServer;
public static void main(String[] args) {
WebServer.create(
Routing.builder()
.get(“/greet”, (req, res)
-> res.send("Hello World!"))
.build().start(); }
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;
public class GreetService {
@GET
@Path(“/greet”)
public String getMsg() {
return "Hello World!"; }

11. Helidon CDI Extensions
CDI extensions to ease integration with cloud services
DataSource
Redis
Oracle Cloud Object Store
Tech Preview
For details see talk DEV5422

12. Status 0.10.4 Backlog Helidon MP: Microprofile ~1.2 Helidon SE
Less JWT plus CDI 2.0, JAX-RS 2.1, JSON-P 1.1, JSON-B 1.0
Helidon SE
WebServer, Config, Security
JSON-P
Metrics
OpenTracing
HTTP/2 (experimental)
CDI Extensions
MicroProfile 2.x
Reactive HTTP Client
GraalVM integration
Project Starter UI
Reactive storage (NoSQL, ADBC)
Open API
Eventing

13. Open Source Project
@helidon_project

14. Sessions Day Time Room Session Title Tue 4:00pm Lounge A THT6770
Meet the Experts Area at the Developer Exchange: Helidon
Wed
12:30pm
2011
DEV5539
Helidon: Java Libraries for Writing Microservices
2016
DEV5432
Writing Kubernetes controllers using Java SE and CDI 2.0
Thu
11:00am
DEV5422
Helidon Extensions: CDI Extensions for the Cloud
12:00pm
2003
DEV5371
Helidon Deep Dive: An Up-close Look at the Helidon Java APIs for Microservices
2:00pm
2006
DEV5580
GraalVM Vision and Roadmap

15. Demo Quickstarts Server config and startup Basic Routing
Basic JSON handling

16. Copyright © 2018 Oracle. All rights reserved.
Q & A
Copyright © 2018 Oracle. All rights reserved.