Microprofile, RxJava, React.js - what else do you need to build lightweight but robust reactive systems efficiently with opensource tools? Maybe something for effective data processing and distributed persistence? You can have it too with Kafka and Hazelcast. Now let’s have a look at how to assemble all together in almost no time, using Payara Micro. You’ll learn how to use a couple of simple tools to build a highly efficient, scalable and robust system that can be evolved continuously to meet rapidly changing needs and increasing loads. Presented at JavaLand 2018

1. BE REACTIVE AND MICRO
WITH A MICROPROFILE
STACK
Ondrej Mihályi
@omihalyi

2. WHAT DO WE WANT?
@OMihalyi

3. there should be a
PROBLEM to solve
WHY DO WE WANT IT?
@OMihalyi

4. BETTER USER EXPERIENCE
updates when ready, reduced
waiting
errors raised ASAP
users can react faster
avoids unnecessary user retries
@OMihalyi

5. HANDLE HIGH LOADS
utilize resources at maximum (CPU)
threads aren't wasted by blocking
avoid blocking of new requests
@OMihalyi

6. HANDLE MASSIVE LOADS
scale to more nodes
messaging to distribute the load
@OMihalyi

7. DON'T FORGET ABOUT FAILURES
fail fast and avoid waste
make sure failures are handled
failures happen a lot more in
distributed systems
@OMihalyi

8. WHAT IS MICROPROFILE?
open-source specification for Java
microservices ( )microprofile.io
@OMihalyi

9. REACTIVE SUPPORT IN
MICROPROFILE
Asynchronous REST (JAX-RS)
CDI events
easy Fault Tolerance
Monitoring via Metrics
@OMihalyi

10. WE'LL ADD WHAT'S MISSING
RxJava
handle callbacks and data streams
asynchronous Fault Tolerance
React.js
easy updates on events
@OMihalyi

11. OUR DEMO APPLICATION
@OMihalyi

12. DEMO
Source: https://github.com/OndrejM-demonstrations/Reactive-and-Micro-
with-MicroProfile-and-Payara
@OMihalyi

13. WE'LL ADD MORE
Java EE 8
reactive REST client (JAX-RS)
Server-Sent Events
Kafka JCA connector
Hazelcast
distributed cache and other structures
NoSQL distributed datastore
@OMihalyi

14. DEMO
@OMihalyi

15. PAYARA SERVER
MicroProfile, Java EE, Hazelcast, Cloud JCA
Connectors, CDI event bus
dynamic clustering (suitable for cloud)
fast development
admin console
monitoring
@OMihalyi

16. PAYARA MICRO
APIs as in Server (except SOAP, remote EJB)
most of features of the Server
executable JAR, <70 MB
easier to install and run apps
command line, maven plugin
build uber JAR
@OMihalyi

17. WHAT TO AVOID
relying on request scope
relying on thread local
using synchronous CDI interceptors
Don't jump to reactive before needed
@OMihalyi

18. QUESTIONS?
Thank you!
@OMihalyi