The document discusses how to develop cloud-native applications with Java using microservices, containers, Kubernetes, and Istio. It provides an example application to demonstrate traffic management, resiliency, and distributed logging capabilities. The example application code is available on GitHub to allow readers to try out the end-to-end microservices example discussed in the document.

1. How to develop your first
cloud-native Applications
with Java—
Niklas Heidloff
Developer Advocate, IBM
@nheidloff
Harald Uebele
Developer Advocate, IBM
@Harald_U

2. Once upon a time ...

3. “Never not be afraid”
@nheidloff @Harald_U #IBMDeveloper github.com/nheidloff/cloud-native-starter
Grug Crood
Beginning of ‘The Croods’

4. “Microservices are a software
development technique [...]
that structures an application
as a collection of loosely
coupled services.”
Wikipedia
@nheidloff @Harald_U #IBMDeveloper github.com/nheidloff/cloud-native-starter

5. Continuous delivery
→ DevOps
Elasticity
→ Responsive apps
What are cloud-native Applications?
@nheidloff @Harald_U #IBMDeveloper github.com/nheidloff/cloud-native-starter

6. New Options → New Challenges

7. “A container image is a
lightweight, standalone,
executable package of
software that includes
everything needed to run an
application.”
docker.com
#IBMDeveloper github.com/nheidloff/cloud-native-starter
Infrastructure
Host Operating System
Container Runtime
AppA
AppB
AppC
AppD
AppE

8. “I’m a caveman. Can you
explain containers so that I
understand it?”
@nheidloff @Harald_U
Grug Crood
Caveman learning microservices

9. Portable Containers

10. Java Image
@nheidloff @Harald_U
Open source stack
OpenJ9 0.12.1
OpenJDK 8u202-b08 from AdoptOpenJDK
Open Liberty 18.0.0.4
MicroProfile 2.1
Dockerfile
#IBMDeveloper github.com/nheidloff/cloud-native-starter

11. “Kubernetes (K8s) is an open-
source system for automating
deployment, scaling, and
management of containerized
applications.”
kubernetes.io
@nheidloff @Harald_U #IBMDeveloper github.com/nheidloff/cloud-native-starter

12. “When a container contains
everything to run a
microservice, why do I need
Kubernetes?”
@nheidloff @Harald_U
Grug Crood
Caveman learning microservices

13. Example Application

14. Example Application – REST APIs
Web-App Web-API
Articles
Authors
Browser Kubernetes with Istio

15. Consuming REST APIs
@nheidloff @Harald_U
MicroProfile Rest Client
Type-safe approach to invoke RESTful services
AuthorsService.java
AuthorsServiceDataAccess.java

16. “Istio is an open platform for
providing a uniform way to
integrate microservices,
manage traffic flow across
microservices, enforce
policies and aggregate
telemetry data.”
github.com/istio/istio
@nheidloff @Harald_U

17. “Why do I need a service
mesh? Can’t I just use
Kubernetes?”
@nheidloff @Harald_U
Grug Crood
Caveman learning microservices

18. Example Application – Traffic Management
Web-App
Web-API v1 Articles
Web-API v2 Authors
Browser Kubernetes with Istio

19. Traffic Management – Web API Version 1

20. Traffic Management – Web API Version 2

21. Traffic Management
@nheidloff @Harald_U
Example: 80% / 20% splitting
ingress.yaml

22. Traffic Management Demo

23. “Optimizing Enterprise Java
for a Microservices
Architecture.
[...] by innovating [...] with a
goal of standardization.”
microprofile.io
@nheidloff @Harald_U #IBMDeveloper github.com/nheidloff/cloud-native-starter

24. “Dude, I just learned Istio and
Kubernetes. Can you show
me a simple MicroProfile
example?”
@nheidloff @Harald_U
Grug Crood
Caveman learning microservices

25. Example Application – Resiliency
Web-App Web-API
Articles
Authors
Browser Kubernetes with Istio

26. Resiliency
@nheidloff @Harald_U
Authors service not available
Usage of default values
Service.java

27. Resiliency
@nheidloff @Harald_U
Articles service not available
MicroProfile Fallback annotation
Service.java

28. Resiliency Demo

29. Resiliency Demo – No Authors and Articles Service

30. “Microservices sound great,
but where is the log file?”
@nheidloff @Harald_U
Grug Crood
Caveman learning microservices

31. Monitoring MetricsTracingLogging
Observability
@nheidloff @Harald_U #IBMDeveloper github.com/nheidloff/cloud-native-starter

32. Example Application – Distributed Logging
Web-App Web-API
Articles
Authors
Browser Kubernetes with Istio

33. Distributed Logging

34. Example Application – Distributed Logging
Web-App Web-API
Articles
Authors
Browser Kubernetes with Istio

35. Distributed Logging

36. Try out the end-to-end
microservices example
cloud-native-starter!
@nheidloff @Harald_U #IBMDeveloper github.com/nheidloff/cloud-native-starter

37. Architecture: End-to-End Example ‘cloud-native-starter’
Web-App
NoSQL / Cloudant
Web-API v1 Articles
Web-API v2 Authors
Web-App
SQL / Db2
OpenID / App ID
LogDNASysdig
Authentication
@nheidloff @Harald_U
Browser Kubernetes with Istio Optional Cloud Services
Ingress

38. IBM Cloud Kubernetes Service including Istio and Knative

39. “Never not be afraid”
@nheidloff @Harald_U #IBMDeveloper github.com/nheidloff/cloud-native-starter
Grug Crood
Beginning of ‘The Croods’

40. “Never be afraid”
@nheidloff @Harald_U #IBMDeveloper github.com/nheidloff/cloud-native-starter
Grug Crood
End of ‘The Croods’

41. IBM Developer
developer.ibm.com
IBM Cloud Lite account
ibm.biz/nheidloff
IBM loves open source
Kubernetes and Istio
OpenJ9 & AdoptOpenJDK
MicroProfile
Open Liberty
Get familiar with cloud-
native applications and
microservices
Thank you !
Get the code à
@nheidloff @Harald_U #IBMDeveloper github.com/nheidloff/cloud-native-starter