© 2017 IBM Corporation

EclipseCon Europe 2017

Resilient Java Microserviceswith Eclipse MicroProfile

Emily Jiang – MicroProfile Development Lead@emilyfhjiang

Kevin Sutter – MicroProfile and Java EE Architect@kwsutter

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MicroProfile Sessions

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• Open Java EE and Eclipse MicroProfile – A New Java Landscape for Cloud Native Apps• (old title) MicroProfile, Java EE, and the Application Server – Oh

My!• Wednesday, Oct 25, 15:45, Burgersaal 2

• Resilient Java Microservices with Eclipse MicroProfile• (old title) Eclipse MicroProfile: What is it? Is it a Java EE

Replacement?• Wednesday, Oct 25, 16:30, Silchersaal

• MicroProfile BOF• Wednesday, Oct 25, 18:30, Seminarraum 5

• The Monitoring Aspects of Eclipse MicroProfile• Thursday, Oct 26, 11:00, Seminarraum 5

• Eclipse MicroProfile Config and OSGi Config Admin• Thursday, Oct 26, 13:00, Schubartsaal

© 2017 IBM Corporation

§ What are Microservices?– Small concise service – small piece of SOA– Easy to maintain– Easy to release– Loosely coupled a number of them to form a system

§ Microservice best practice– Configurable– Fault tolerance– Monitoring– Secure– Working well in the cloud

§ How to build it the right way?– Use Eclipse MicroProfile

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What is Eclipse MicroProfile?

● Eclipse MicroProfile is an open-source community specification for Cloud Native Java microservices

● A community of individuals, organizations, and vendors collaborating within an open source (Eclipse) project to bring microservices to the Enterprise Java community

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© 2017 IBM Corporation

§ Why Eclipse MicroProfile?– Microservice portable among application servers– No vendor locking unlike Spring– Fast innovating– Frequent release cycle

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http://microprofile.io/MicroProfile adds new enterprise Java capabilities for microservices

Config Fault Tolerance Health Check Health Metrics JWT

externalize configuration to

improve portability

build robust behavior to cope with

unexpected failures

ensure services are running

understand the interactions between

services while running

resolve problems in complex distributed

systems

New in Eclipse MicroProfile Release 1.2: https://projects.eclipse.org/projects/technology.microprofile/releases/1.2

Robust Microservices

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Transient Failure

for (int i = 0; i < 5; i++) {try {

callServiceC();break;

} catch (IOException e) {}

}

service Cservice A

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Transient Failure

@Retry(retryOn=IOException.class,delay = 500,maxRetries=5

public void callServiceC() {// call the service

}

service Cservice A

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Dealing with slow services

service Cservice A5s SLA 5s response

@Timeout(2000)public void callServiceC() {

// call the service}

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Don’t overload serviceC

service Cservice A

@Bulkheadpublic void callServiceC() {

// call the service}

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Circuit Breaker Closed

service Cservice A

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Circuit Breaker Open

service Cservice A

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Circuit Breaker Half-Open

service Cservice A

@CircuitBreaker(failOn=IOException.class,delay = 500)

public void callServiceC() {// call the service

}

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Fallbacks

service Cservice A

@Fallback(MyFallback.class)public void callServiceC() {// call the service

}

private class MyFallbackimplements FallbackHandler {

public void handle(ExecutionContext c) {

// perform fallback action}

}

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MicroProfile Fault Tolerance with Istio

@Retry@Timeout@CircuitBreaker@Bulkhead@Fallback

RetryTimeoutCircuitBreakerBulkhead

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MicroProfile 1.0 (Fall 2016)jaxrs-2.0cdi-1.2jsonp-1.0

MicroProfile 1.1 (August 2017)microProfile-1.0mpConfig-1.0

MicroProfile 1.2 (Sept 2017)microProfile-1.1mpConfig-1.1mpFaultTolerance-1.0mpHealth-1.0mpMetrics-1.0mpJwt-1.0

MicroProfile 1.3 (???)MicroProfile 1.2mpTracing-1.0mpOpenApi-1.0mpRestClient-1.0

MicroProfile 2.0 (???)MicroProfile 1.3jaxrs-2.1 // Java EE 8cdi-2.0 // Java EE 8jsonp-1.1 // Java EE 8jsonb-1.0 // Java EE 8

2017

2018

Aug Sept

© 2017 IBM Corporation22

§ Resources

– http://microprofile.io/

– https://openliberty.io/

– https://www.eclipse.org/community/eclipse_newsletter/2017/september/

– https://github.com/NottyCode/fault-tolerence-examples

– https://liberty-app-accelerator.wasdev.developer.ibm.com/start/

© 2017 IBM Corporation

Thank you