javaee & glassfish ug - digital javaee 7 new & noteworthy by p.pilgrim

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 2


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

Xenonique @peter_pilgrim

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About Me•  Java EE and Scala developer independent

contractor •  Digital transformation / e-commerce •  Java Champion •  Working on the JVM since 1998

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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

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#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(); /* ... */ }

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#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; /* ... */ }

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Conversation Scope

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

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#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; /* ... */ }

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public class SectorFlow { /*...*/ @PostConstruct public void initialize() { footprint.setApplicationId( utilityHelper.getNextApplicationId()); } public String gotoEndFlow() { return "/endflow.xhtml"; } }

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<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>

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<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>

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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"); } }

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#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 */

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#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/peterpilgrim

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List of Creative Commons (2.0) photography attributions

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