Digital Java EE 7 Web APPS Guide

DIGITAL Java EE 7 New
and NOTEWORTHY
Enterprise Java Lives! (18-02-2015)
Peter Pilgrim
Scala and Java EE
Independent contractor
@peter_pilgrim

Xenonique @peter_pilgrim 3

Agenda
•  Digital
•  Java EE 7
•  Java EE Web Technology

Xenonique @peter_pilgrim
Creative Commons 2.0
Attribution-NonCommercial-ShareAlike 2.0 UK:
England & Wales (CC BY-NC-SA 2.0 UK)
https://creativecommons.org/licenses/by-nc-sa/2.0/uk/
•  Share — copy and redistribute the material in
any medium or format
•  Adapt — remix, transform, and build upon the
material
•  The licensor cannot revoke these freedoms as
long as you follow the license terms.
4

About Me
•  Java EE and Scala developer independent
contractor
•  Digital transformation / e-commerce
•  Java Champion
•  Working on the JVM since 1998
5


Why the fuss about so-called Digital?
Haven’t we seen this all before?


#1 Digital
Fast. Agile. User Centric.
Focus on the end-user
Emphasis on Testing
User Experience is significant


#1 Digital
Digital is the Web
Digital is refocusing ideas for
online activities


#1 Digital
Digital is an attitude
Listening to customer needs
Embracing conversation and
communication


#1 Digital
Transformation of our
traditional industrial
Economy to a 21st Century
Mobile to Default one


#1 Digital
With all of the consequences:
politics, society, technology
and web infrastructure.


Is Java EE helpful to digital
developers, designers and
architect? Still relevant?


Java EE 7 released 2013
Built products on top of a standard platform
Transactions, Concurrency, Remote
Endpoints, Lifecycle, State, Persistence
Java is a programming language.
Java is a virtual machine.
Java is a platform.


Java
EE
7

Main Features
•  CDI 1.1
•  JAX-RS 2
•  JSF 2.2
•  Servlet 3.1
•  EJB 3.1
•  JPA 2.1
19


#2 WAR is king (or queen)
WAR files are now the prefer way to deploy
applications for most set-ups
EAR files are still supported however
RAR files are even rarer (Resource ARchive)
PAR files are even rarer still (Persistence ARchive)


#2 Containerless
Suits the Docker / chef / Puppet vis-à-vis the
provisioning generation
Prefer starting up embeddable application
server GlassFish or WildFly server over
deployment WARs
Sadly: Code Hale’s DropWizard only supports Java EE 6


#2 Testable Java EE
Arquillian
Helps with real-world integration testing
Embeddable Container
Also help with direct EJB, JPA, JMS testing


#2 Java EE better Async Support
Servlet 3.1 has Async support
Non-Blocking I/O, HTTP Upgrade mechanism
JAX RS 2.0 has Async support
Client side API with HATEOS, Filters and Handlers
WebSocket 1.0
(Async by default, by protocol)
JMS 2.0 (when used in standalone Java SE)
Asynchronous API for Reactive Programming yet to be
exploited by other frameworks


Java EE 7
Developer
Handbook
September
2013

Packt
Publishing

Digital
Java EE 7
Web APPS
May
2015


Java Server Faces
An Component Oriented Framework


CDI & Faces Scopes

@RequestScoped
@SessionScoped
@ApplicationScoped
@ViewScoped*
@ConversationScoped*
@FlowScoped*


#3 View Scoped
Retained Page View Scope
HTTL Form Data lives for validation
Customer sees their input data
entered after entering errors
Helpful for digital web site


#3 View Scoped
Lifecycle dies on a new page view
Minable eﬀort for digital developers
Helpful for single page forms
Login forms, small data entry journeys
Already in existence since Java EE 6


#3 CDI and EJB
CDI is really useful for code assembly
Depend on session EJB less
Helpful for single page forms
Login forms, small data entry journeys
Already in existence since Java EE 6

View Scope
@Named("contactDetailController")
@ViewScoped
public class ContactDetailController {
@EJB ContactDetailService service;
private ContactDetail contactDetail =

new ContactDetail();
/* ... */
}
32


#4 Conversation Scoped
Basic Customer Journey
Actually existed since Java EE 6
Transient or Persistent
Developer controls the life cycle


#4 Conversation Scoped
Complex Wizard Type Flows
Lifecycle between Request and Session Scope
Backing Bean must be Serializable
Solves a long standing problem with Java Servlet
technology with storing items in HttpSession

Conversation Scope
@Named("lendingController")
@ConversationScoped
public class LendingController
implements Serializable {
@EJB ApplicantService applicantService;
@Inject Conversation conversation;
@Inject Utility utility;
/* ... */
}
35

Conversation Scope
public class LendingController { /* ... */
public void checkAndStart() {
if ( conversation.isTransient()) {
conversation.begin();
}
recalculatePaymentMonthlyTerm();
}
public void checkAndEnd() {
if (!conversation.isTransient()) {
conversation.end();
}
}
}
37


#5 Flow Scoped
Underrated Star of JSF 2.2
Lifecycle between Request and Session Scope
Controller, resources & page views
with protected and encapsulated
access


#5 Flow Scoped
Flow can be implicit
Can be explicitly defined with XML
A Flow has one single entry point
A Flow has at least one exit point


#5 Flow Scoped
Flow can invoke another one
Faces Flow are nestable
Inbound named parameters
Outbound named parameters
Special flowScope map collection


#5 Flow Scoped
Custom Flow Components
Distribute Faces Flows defined in 3rd party JARs
Resource Library Contracts
Apply CSS, JavaScript and resources
Special flow scope map collection
To pass data in between Faces Flows

Flow Scoped (Sector)
@Named
@FlowScoped("sector-flow")
public class SectorFlow implements
Serializable {
@Inject UtilityHelper utilityHelper;
@Inject CarbonFootprintService service;
/* ... */
}
42

public class SectorFlow {
/*...*/
@PostConstruct
public void initialize() {
footprint.setApplicationId(
utilityHelper.getNextApplicationId());
}

public String gotoEndFlow() {
return "/endflow.xhtml";
}
}
43

<faces-config version="2.2" ...>
<flow-definition id="sector-flow">
<flow-return id="goHome">
<from-outcome>/index</from-outcome>
</flow-return>
<flow-return id="endFlow">
<from-outcome>#{sectorFlow.gotoEndFlow()}
</from-outcome>
</flow-return>

...

</faces-config>
44

<faces-config version="2.2" ...>
...
<flow-call id="callFootprintFlow">
<flow-reference>
<flow-id>footprint-flow</flow-id>
</flow-reference>

<outbound-parameter>
<name>param3FromSectorFlow</name>
<value>#{sectorFlow.footprint}</value>
</outbound-parameter>
</flow-call>
</flow-definition>
</faces-config>
45

Flow Scoped (Footprint)
@Named
@FlowScoped("footprint-flow")
public class FootprintFlow implements Serializable {
private CarbonFootprint footprint;

public FootprintFlow() { }

@PostConstruct
public void initialize() {}
Map<Object,Object> flowMap =

FacesContext.getCurrentInstance()

.getApplication().getFlowHandler()

.getCurrentFlowScope();
footprint = (CarbonFootprint) flowMap.get("param3Value");
}
}
46


#6
MVC
1.0

Targeting Java EE 8
JSR 371 Model View Controller
Action Oriented Request Framework


#6
MVC
1.0

Separate
View
layer
to
JSF

Standardising
on
Java
RS
2.0
over
Servlet
4.0

Inﬂuenced
by
Jersey
MVC
Templates

Appears
to
direct
compete
with
Spring
MVC


#6
MVC
1.0

How
to
customise
the
view
layer?

Facelets,
Mustache,
Handlebars,
JSP

Expression
language
and
glue
logic?

bind
the
model
to
the
view
and
Bean
ValidaNon

What
is
the
Lifecycle?

How
long
do
POJOs
live
within
the
framework
(CDI)


#6
MVC
1.0

Looks
a
good
fit
for
AngularJS

single
page
applicaNons
with
EmberJS

IntegraTon
JAX-‐RS
provide
duality

Define
regular
RESTful
endpoints
and
controller

Solo
API
suits
the
Web
Profile

MVC
may
be
bundle
with
GlassFish
Web,
Tomcat,
Undertow

MVC 1.0 Example
@Path("payments")
@Controller
public class PaymentsEndpoint {
@GET
@Path("accounts")
public Viewable get() {

PaymentDataModel model = somewhere();
return new Viewable(
"list-accounts.jsp", model);
}
} /* API is still changeable */

52


#Conclusion(1)
Going Digital with Java EE 7
Perfectly feasible.
What do you want?
What is it do you really to do?


#Conclusion(2)
Micro-services? Check.
Transactions? Check ✔
Concurrency? Check ✔
Persistence? Check ✔
REST? Check ✔
Standard platform? Check ✔


#Conclusion(3)
Agility? Fast turnaround?
Testable? Definitely check ✔
Recruitable? Absolutely ✔
Dependable? ✔
Extendible? ✔
Trainable? But of course ✔


#Conclusion(4)
Seriously look at Faces Flows
Build small units of functionality in the web (generally)
Allow for shake up & down from User Experience Testing
Keep an eye on MVC 1.0 and JAX-RS 2.1
Open source libraries need to adopt and catch up!


May 2014


@peter_pilgrim

uk.linkedin.com/in/peterpilgrim2000/

List of Creative Commons (2.0)
photography attributions
https://flic.kr/p/dhf3FQ
https://www.flickr.com/photos/epsos/
epSos.de
Big Beautiful Face Statue in Tenerife
https://flic.kr/p/Pp93n
https://www.flickr.com/photos/spacesuitcatalyst/
William A. Clark Follow
Measurement
Measure twice, cut once.
https://flic.kr/p/opvVsg
https://www.flickr.com/photos/gregbeatty/
Greg Beatty Follow
Three Pillars
Nikon D800 16-35MM F4.0
https://flic.kr/p/81dXuT
https://www.flickr.com/photos/froboy/
Avi Schwab Follow
Equipment used for measuring planes of crystals
60

https://flic.kr/p/ayqvZp
https://www.flickr.com/photos/throughpaintedeyes/
Ryan Seyeau Follow
1000 Faces of Canada # 0084 - Zombie Walk - Explore!
Shot during the annual Zombie Walk in Ottawa.
https://flic.kr/p/8XY4tr
https://www.flickr.com/photos/creative_stock/
Creativity 103
electronic circuit board
https://flic.kr/p/8Y2625
https://www.flickr.com/photos/creative_stock/
Creativity 103
computer motherboard tracks
https://flic.kr/p/2QHt7Q
https://www.flickr.com/photos/rosefirerising/
rosefirerising Follow
Pierre Curie, Piezo-Electroscope
61

https://www.flickr.com/photos/code_martial/
https://flic.kr/p/7jmU5n
Tahir Hashmi Follow
Developer Death
10 Programmers and a UX Designer died all of a sudden in a war room situation. They were
apparently working too hard.
https://www.flickr.com/photos/8268882@N06/
https://flic.kr/p/duwd1M
Peter Pilgrim
IMG_1481
European JUG leaders meeting in Devoxx 2013
https://www.flickr.com/photos/unicefethiopia/
https://flic.kr/p/dv4ooi
UNICEF Ethiopia Follow
Hamer mother and child South Omo Zone, SNNPR
Hamer mother and child South Omo Zone, SNNPR.
©UNICEF Ethiopia/2005/Getachew
62

https://flic.kr/p/baULpM
N i c o l a Follow
Tree - IMG_1242
https://flic.kr/p/dwCQ7t
marsmetn tallahassee Follow
IDA .. Integro-Differential Analyzer (Sept., 1952) ...item 2.. Richard Dreyfuss: Technology Has 'Killed Time' -- "In geopolitics, the
removal of time is fatal." -- "And you will give up, the protection of Republican Democracy." (July 19 2010) ...
https://flic.kr/p/6ZDbiZ
https://www.flickr.com/photos/ingmar/
Ingmar Zahorsky Follow
Traffic Jam
Accidents are common on the narrow streets going through the mountains of Nepal. When such an accident occurs, traffic is often
halted for up to 3-4 hours.
https://flic.kr/p/FAskC
https://www.flickr.com/photos/mari1008/
mari_1008 Follow
traffic jam -B
Date: April,2th
Address: Jiangshu Rd,Shanghai,China.
Around 8:30 AM today, A little accident on YuYuan Rd and JiangSu Rd caused traffic jam.
63

https://flic.kr/p/bpss6D
Victor1558 Follow
Creative_Photoshop_HD_Wallpapers_laba.ws
https://flic.kr/p/mLxu3m
https://www.flickr.com/photos/astrangelyisolatedplace/
astrangelyisolatedplace Follow
Oﬃce test #1. Setup fully functional. A rare 1200 no longer in production. Test run
soundtracked by the only #vinyl in the oﬃce; The Sesame Street Soundtrack - a
surprise present by @idinesh #technics #turntable #1200 #ocdv1
via Instagram ift.tt/1hpeUEU
https://flic.kr/p/gLPhEk
https://www.flickr.com/photos/stevecorey/
Steve Corey Follow
Treasure Hunt, a short story (5 images)
64

https://flic.kr/p/4JcerK
Bömmel Follow
Ice Crystal
Ice is nice
https://flic.kr/p/dSsXiZ
https://www.flickr.com/photos/jeremyhall/
Jeremy Hall Follow
Called to Serve (suit and tie)
https://flic.kr/p/3enERy
https://www.flickr.com/photos/paolocampioni/
Paolo Campioni Follow
scala
Scendo (stair case spiral)
65

https://flic.kr/p/m62gmK
https://www.flickr.com/photos/lata/
-p Follow
Abstraction I.
From my platycerium. (Guide: Voronoi diagram)
https://flic.kr/p/9F7Nnn
https://www.flickr.com/photos/followtheseinstructions/
Follow these instructions
The end ; Assignment: This time your assignment is to find or compose a scene that conveys the essence of the end.
https://flic.kr/p/6WSFR4
anthony kelly Follow
big ben
big ben and underground sign
https://flic.kr/p/w7qef
https://www.flickr.com/photos/cobalt/
cobalt123 Follow
All We are Saying... (Thought for a New Year)
Peace Pasta from Annie's, with peas, of course.
Give Peace A Chance
66

Digital Java EE 7 Web APPS Guide

Recommended

Recommended

More Related Content

What's hot

What's hot (20)

Viewers also liked

Viewers also liked (11)

Similar to Digital Java EE 7 Web APPS Guide

Similar to Digital Java EE 7 Web APPS Guide (20)

More from Payara

More from Payara (20)

Recently uploaded

Recently uploaded (20)

Digital Java EE 7 Web APPS Guide