Java EE Microserviceswith WIldFly Swarm

John ClinganSenior Principle Product Manager

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● 19 year OCJUG member● Java developer since 1996● Ex-GlassFish and Ex-Java EE Product Manager (Sun & Oracle)

○ Java EE 6 - Java EE 8 (Planning)● Product Manager @ Red Hat for next-gen platforms● Java EE 7 Instructor at UC Irvine Extension

Who Am I

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Microservices Defined

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Pick a definition

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Microservices DefinedTwo Pizza teams

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“In short, the microservice architectural style is an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API. These services are built around business capabilities and independently deployable by fully automated deployment machinery. There is a bare minimum of centralized management of these services, which may be written in different programming languages and use different data storage technologies.”

- Martin Fowler, ThoughtWorks

Microservices Defined

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GOALAgility / Velocity

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Pause - Switch to MicroProfile

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Are you Ready for Microservices?

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● Basecamp○ Millions of users○ 200 controllers with 900 methods plus …○ … 190 classes with 1473 methods○ Happy with their approach

The Majestic MonolithBut first, a message from the “dark side”

“Every time you extract a collaboration between objects to a collaboration between systems, you’re accepting a world of hurt with a myriad of liabilities and failure states.”

Link: http://bit.ly/MajesticMonolith

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Java EE Microservices

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Java EE 7 APIs

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Traditional Java EE Application Server Management

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Architecture vs API vs Implementation

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Microservices is an architectural approach

Java EE is a set of API specificationsenabling the community to

innovate on implementation

Java EE applications can be built as aSet of collaborating microservices

on a lightweight runtime

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Java EE Microserviceswith WildFly Swarm

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Wildly Swarm

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● OSS Project sponsored by Red Hat

● Focused on Java EE Microservices

● Sidekick of WildFly Application Server

● Growing and active community

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● Use the APIs you want

● Include the capabilities you need

● Wrap it up for deployment

Just Enough Application Server

Product PricingService

JAX-RS

Web Front End

JPA

JMS EJB

BeanValidationETC...UNUSED

WildFly Application Server

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Converting Existing App to an Uberjar

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● swarmtool - Create an uberjar out of an existing .war file

● Or, add WildFly Swarm maven plugin to your pom.xml

A very different kind of implementation

<plugin> <groupId>org.wildfly.swarm</groupId> <artifactId>wildfly-swarm-plugin</artifactId> <version>${wildfly-swarm-version}</version> <executions> <execution> <id>package</id> </execution> </executions></plugin>

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Show some code

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Creating a WildFly Swarm App from ScratchWildFly Swarm Generator

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Creating a WildFly Swarm App from ScratchJBoss Forge

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● Provide a specific piece of functionality○ May map to a WIldFly subsystem○ Or non-WildFly functionality (Ribbon, Keycloak)

● Fractions can provide deployments○ Topology deployment give access to the topology

● Fractions can alter user deployments○ Keycloak fraction can be used to secure a deployment

● Can be auto-detected by Swarm plugin, or specifically enabled and configured

FractionsErrr, kinda like a module

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● Not required● Fractions provide reasonable defaults● If you do not provide a Main(), a default Container is created● If you provide a Main()

○ Then you can manually override defaults○ And do more

■ Locate other services■ Dynamically adapt components

To Main() or not to Main()

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Simple Java EE Monolithwildfly-swarm.io/tutorial

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Show some code

Inversion of (Platform) Control

Java Microservices

Java Microservices (continued)

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Wildfly-swarm.io

github.com/wildfly-swarm● Presentations● Examples

github.com/redhat-helloworld-msa/helloworld-msagithub.com/javaee-samples/javaee7-samples

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The End