java ee is back in town

powered byLars Röwekamp Java EE

Java EE

JavaEE is back in Town

Dienstag, 10. Mai 2011

J2EE 2003

“oh nooo!“


Java EE 2010

“oh yeah!“


What was the Deal about?Walk of Pain. Walk of Fame. What‘s next?


The Deal: Business, not Infrastructure


I‘ am a

BusinessDeveloper


„The Java™ Platform, Enterprise Edition (J2EE) reduces the cost and

complexity of developing multitier, enterprise services.

Java EE applications can be rapidly deployed and easily enhanced as the enterprise responds to competitive

pressures.“

Zitat: Java™ Platform, Enterprise Edition (J2EE) Specification, v1.4


J2EE? WT #?*K !Walk of

Pain


Schneller!Höher!Weiter!


Schneller!Höher!Weiter!

Aber wohin?


Nix als Probleme ...


12

ProblemfeldKomplexität


13

Problemfeldtech. Schwachstellen


14

ProblemfeldPerformance


15

HauptproblemfeldEnterprise JavaBeans


No more EJB!

No more

Complexity!


No more EJB!

No more

Complexity!

No more

J2EE

Container!


... but ...

much more FUN, pleeeeease!


Walk of Pain

Problem: „Komplexität &tech. Schwachstellen“


Walk of Pain Antwort I: „Patterns“



Walk of Pain


Antwort II: „Alternativen“


ProblemInnovation

CommunitySolution

Community

Feedback

ProprietarySolution

???


ProblemInnovation

CommunitySolution

Community

Feedback

ProprietarySolution

???

¡ Spring Framework¡ Hibernate¡ Google Guice¡ Hivemind¡ Pico


ProblemInnovation

Standardsbased on

CommunitySolutions

¡ Spring Framework¡ Hibernate¡ Google Guice¡ Hivemind¡ Pico

¡ JAVA EE

CommunitySolution

Community

Feedback


Walk of Fame


Ease of Development & Flexibility


EoD:Convention over ...


Weniger ist mehr ...


@ManagedBean

public class LoginBean {

! private String userName; !private String passwordName; ! ...

}

EoD: Convention over ...


@ManagedBean(name=“loginBean“) @RequestScoped public class LoginBean {

! private String userName; !private String passwordName; ! ...

}



@Stateful public class ShoppingBean {

! private List<Items> items; !! public void addItem(Item item) {...}; ... }



@Stateful public class ShoppingBean implements ... {

! private List<Items> items; ! // Transactional by default! public void addItem(Item item) {...}; ... }



@Stateless(name=“MyEjb“) @Local(MyInterface) @PermitAll @TransactionManagement(value=

TransactionManagementType.CONTAINER) public class MyEjb implements MyInterface { @TranactionAttribute(value=REQUIRED) public void myBusinessMethid() { // some implementation

} ...

}



<empty />*)


<empty />*)

*) XML optional nutzbar


package de.openknowledge.shop @WebServlet(name=“ShopServlet“, urlPattern=“/doShopping“) public class ShoppingServlet ! ! ! ! implements HttpServlet {

! ...

}

EoD: XML-less Deployment ...


package de.openknowledge.shop @WebServlet(name=“ShopServlet“, urlPattern=“/doShopping“) public class ShoppingServlet ! ! ! ! implements HttpServlet {

! ...

}

EoD: XML-less Deployment ...

<web-app> <servlet> <servlet-name>ShopServlet</servlet-name> <servlet-class> de.openknowledge.shop.ShoppingServlet </servlet-class> </servlet> <servlet-mapping> <servlet-name>ShopServlet</servlet-name> <url-pattern>/doShopping</url-pattern> </servlet-mapping>...</web-app>

EoD: Dependency Injection


@WebServlet(urlPattern=“/doSomething“) public class ShoppingServlet ! ! ! ! implements HttpServlet {

public void doGet() { DataSource ds = (DataSource)ServiceLocator.lookup(! ! ! “jdbc/myDataSource“ );! ds.getConnection(); ...! } }

EoD: Dependency Injection ...


@WebServlet(urlPattern=“/doSomething“) public class ShoppingServlet ! ! ! ! implements HttpServlet {

! @Resource(“jdbc/myDataSource“) private DataSource ds;

! public void doGet() { ds.getConnection(); ...! } ... }



EoD:Plain old Java ObjectsDienstag, 10. Mai 2011

EoD: Plain old Java Objects ...


public interface SCart { public void addItem(Item item); }

@Stateful(name=“ShoppingCart“) public class SCartEJB implements SCart {

private List<Items> items; public void addItem(Item item) {...}; ... }



Ease of Development & Flexibility


Flexibility: API Overloading


Different ProfilesDifferent Needs


Flexibility: Java EE Profiles


Session Beans

JPA 2.0

Interceptors

Tx & Security

Local & None

Flexibility: EJB Lite


Flexibility: EJB Lite

MDB

Entity Beans

Web Services

Timer & Async

Remote


Flexibility: Component Models



Enterprise JavaBeans



Enterprise JavaBeans

Life Cycle Mmgt.

Instance Pooling

Concurrency

Transaction

Security

Scoping

...


Flexibility: Component Models CDI Beans


Flexibility: Component Models CDI Beans

Life Cycle Mmgt.

Scoping

... AND ...

*** Extensibility ***


Flexibility: Component Models CDI Konzepte


Flexibility: Component Models CDI Konzepte

Typensicher DI(Stereotypes, Qulifier)

Loose Koopelung(Events, Interceptors)

Sichtbarkeiten(Sopes, LifeCycle )

„FACHLICHE INJECTION“


Java EE 7


Java EE 7

„The Cloud Edition“


Java EE 7


Easely operate on Clouds

Latest Web Standards

PaaS Support

Multi-Tenancy

Elasticity

Modularity

Versioning


...Dienstag, 10. Mai 2011

Java EE 7


Java EE 7


Expression Language 3.0

Java Messaging Service 2.0

Java Server Faces 2.2

Java Persistence API 2.1

CDI 1.1

JAX-RS 2.0

Web Sockets

Java JSON API

Cuncurrency & Caching...


Java EE 7


Java EE 7„The Cloud Edition“


Java EE 7„The Cloud Edition“ „Ja“


Java EE 7„The Cloud Edition“ „Ja“

(a.k.a. Q3 / 2012)


Java EE

Java EE

StartUpgradeSwitch


Gibt es noch Fragen?

Dann los ...


java ee is back in town

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