Learn about key features of Jakarta EE 8 and MicroProfile 3.3 from Edwin Derks and Josh Juneau.

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February 17th, 2021
Josh Juneau & Edwin Derks
@javajuneau | @edwinderks
Jakarta EE & MicroProfile

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About Us
Josh Juneau
Chicago Java Users Group
Executive Board
Application Developer
Database Administrator
Author, Blogger, Podcaster
Apache NetBeans Committer/Java
Champions/Jakarta EE Guardians
Edwin Derks
Software Architect
Author, Blogger, Speaker
Contributor for Jakarta EE
Committer for MicroProfile
Member of Jakarta EE Guardians

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Agenda
- Demonstrate some cool features with
Jakarta EE and MicroProfile that
- are key features
- you possibly don't use everyday
- We will monitor the Q&A in order to answer
your questions and feedback during the
session

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Jakarta EE 9
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Download Payara Server or Payara Micro (Jakarta EE 8, MP 3.3)
Incorporate the dependencies into your project...the examples in this
presentation use Jakarta EE 8.
Jakarta EE 9 will NOT be backward compatible with Jakarta EE 8.
Specification Documents
Examples for this demo:
https://github.com/juneau001/JakartaEE-MicroProfile-Demos
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Get Started Today

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Namespace Change
● javax.* to jakarta.*
Specification Documents
Java SE 11 support is not be available out of gate, but will be
with Jakarta EE 9.1
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Jakarta EE 9 Overview

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Latest Additions:
- Modularization, support for Java SE
- Observers Ordering
- Asynchronous Events
- Configurators for major SPI elements
- Configure or Veto Observer Methods
- Apply Interceptor on Producers
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Jakarta CDI

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How does one mark a CDI event as asynchronous?
Solution:
Fire the event calling upon the fireAsync() method, passing the event class.
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Jakarta CDI - Async

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Standard binding layer for converting Java objects to/from JSON.
- Serialize/de-serialize objects to/from JSON
- Mapping of Primitive Types
- Serialize Collections and Maps
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Jakarta JSON Binding

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Read a JSON document and convert it into a Java object
Utilize default JSON binding mapping to quickly map a POJO.
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Jakarta JSON Binding

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Create JSON from a Java Object
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Jakarta JSON Binding

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- Jakarta EE provides an API to parse, transform, and query JSON data
using the object model or streaming model
- JsonObjectBuilder is used to build a JSON object
- Call upon the Json.createObjectBuilder() method to create a
JsonObjectBuilder.
- Call upon the Json.createArrayBuilder() method to create a JsonArray
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Jakarta JSON Processing

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JSON Pointer and JSON Patch
JSON Pointer allows one to point to a particular element within a JSON
Structure
Utilize JSON Patch to replace a specified value within a JSON document
with another value.
- Editing/Transformation Operations Added to the JSON Object Model
JSON defines only two data structures: Objects, Arrays
JSON define seven value types: String, number, object, array, true, false,
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Jakarta JSON Processing

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LocalDateTime Conversion
Ability to convert Date-Time API values to/from expression language
JSF as Microservices Front End
The examples utilize JSF views and @ViewScoped controller classes to
interact with remote web services, which in-turn, performs transactions
against an RDBMS..
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Jakarta Server Faces

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JAX-RS Client
The examples utilize JSF views and @ViewScoped controller classes to
interact with remote web services to update the database.
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Jakarta RESTful Web Services

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Server Sent Events
- One way communication channel
- Text protocol, “text/event-stream” media type
- Multiple Messages
- Retry interval
SSEEventSink used to send stream of messages
SSEEvent is base event class, OutboundSseEvent packages an event
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Jakarta RESTful Web Services

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Standard Security Provided
- Ability to apply across multiple identity stores: Database, LDAP,
Embedded
- Annotations for ease of development
- Remembers caller (cookie, identity store)
- Group to Role Mapping
- Standard expression language accessors
- Simplified HttpAuthenticationMechanism interface with three default
implementations: basic, form, LDAP
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Jakarta Security

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Validate field content using simple annotations
- Support for more flexible cascaded validation of constraint types
- Support for java.util.Optional
- Support for @Past and @Future
- New annotations: @Email, @NotEmpty, @NotBlank, @Positive,
@PositiveOrZero, @Negative, @NegativeOrZero, @PastOrPresent,
@FutureOrPresent
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Jakarta Bean Validation

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Updated in latest releases:
- Streams
- Repeatable Annotations
- Date-Time API
- CDI Injection in AttributeConverters
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Jakarta Persistence

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Full-Duplex Communication Between Peers
- Create a WebSocket endpoint by annotating a POJO with
@ServerEndpoint
- Create a message receiver method and annotate with @OnMessage
- Supports:
- @OnOpen
- @OnError
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Jakarta WebSockets

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MicroProfile

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MicroProfile - Health
Health probes for Kubernetes
● Liveness vs Readiness probes
○ liveness probe restart container when
not healthy
○ readiness probe when container is ready
to receive traffic
Example
● Programmatic readiness probe

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MicroProfile - Config
Property injection
● This specification is not part of Jakarta EE
○ Spring Framework/Boot does also contain this
feature
○ Can inject properties provided by the app or the
environment, like Kubernetes
Example
● Inject in Jakarta EE JAX-RS endpoint
○ This is an example of where Jakarta EE and
MicroProfile complement each other

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MicroProfile - RestClient
HTTP client specification
● JAX-RS and MP RestClient both have
programmatic client
● MP RestClient can annotate interfaces
Example
● Use CDI and MP Config to inject the MP
RestClient with an environment-specific
URL

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MicroProfile - FaultTolerance
Increase the success rate of your
requests by adding resilience to
requests
Good practice to add:
@Retry how many times will the request be
repeated on error
@Timeout how long will the client wait for a
response
@Fallback what will the behaviour be when no
retries are left

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MicroProfile - FaultTolerance
Increase the success rate of your
requests by adding resilience to
requests
More advanced tuning of resilience:
@CircuitBreaker fail incoming requests when calls to a
downstream service are
subsequently failing over a defined
threshold
@Bulkhead Limit concurrent requests to a
downstream service

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Infrastructure

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Ship your dependencies as part of the infrastructure
● Download and ship your project's dependency together with the
Docker Image
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Docker Image

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30. Thank you!
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