Java Platform, Enterprise Edition
















Java Platform, Enterprise Edition (Java EE), formerly Java 2 Platforms, Enterprise Edition (J2EE), currently Jakarta EE, is a set of specifications, extending Java SE[1] with specifications for enterprise features such as distributed computing and web services.[2] Java EE applications are run on reference runtimes, that can be microservices or application servers, which handle transactions, security, scalability, concurrency and management of the components it is deploying.


Java EE is defined by its specification. The specification defines APIs and their interactions. As with other Java Community Process specifications, providers must meet certain conformance requirements in order to declare their products as Java EE compliant.


Examples of contexts in which Java EE referencing runtimes are used are: e-commerce, accounting, banking information systems.




Contents






  • 1 History


  • 2 Specifications


    • 2.1 Web specifications


    • 2.2 Web service specifications


    • 2.3 Enterprise specifications


    • 2.4 Other specifications




  • 3 Web profile


  • 4 Certified referencing runtimes


  • 5 Code sample


    • 5.1 Example Backing Bean class


    • 5.2 Example Data Access Object class


    • 5.3 Example Entity class




  • 6 See also


  • 7 References


  • 8 External links





History


The platform was known as Java 2 Platform, Enterprise Edition or J2EE from version 1.2, until the name was changed to Java Platform, Enterprise Edition or Java EE in version 1.5. The current version is called Java EE 8.



  • J2EE 1.2 (December 12, 1999)

  • J2EE 1.3 (September 24, 2001)

  • J2EE 1.4 (November 11, 2003)

  • Java EE 5 (May 11, 2006)

  • Java EE 6 (December 10, 2009)

  • Java EE 7 (May 28, 2013,[3] but April 5, 2013 according to spec document. June 12, 2013 was the planned kickoff date[4])

  • Java EE 8 (August 31, 2017[5])


Java EE was maintained by Oracle under the Java Community Process. On September 12, 2017, Oracle Corporation announced that it would submit Java EE to the Eclipse Foundation.[6]
The Eclipse top-level project has been named Eclipse Enterprise for Java (EE4J).[7]. The Eclipse Foundation was forced to change the name of Java EE because Oracle owns the trademark for the name "Java." [8] On February 26, 2018, it was announced that the new name of Java EE will be Jakarta EE. [9]



Specifications


Java EE includes several specifications that serve different purposes, like generating web pages, reading and writing from a database in a transactional way, managing distributed queues.


The Java EE APIs include several technologies that extend the functionality of the base Java SE APIs, such as Enterprise JavaBeans, connectors, servlets, JavaServer Pages and several web service technologies.



Web specifications




  • Servlet: defines how to manage HTTP requests, in a synchronous or asynchronous way. It is low level and other Java EE specifications rely on it;

  • WebSocket: The Java API for WebSocket specification defines a set of APIs to service WebSocket connections;


  • Java Server Faces: a technology for constructing user interfaces out of components;


  • Unified Expression Language (EL) is a simple language originally designed to satisfy the specific needs of web application developers. It is used specifically in Java Server Faces to bind components to (backing) beans and in Contexts and Dependency Injection to name beans, but can be used throughout the entire platform.



Web service specifications




  • Java API for RESTful Web Services provides support in creating web services according to the Representational State Transfer (REST) architectural pattern;

  • Java API for JSON Processing is a set of specifications to manage information encoded in JSON format;

  • Java API for JSON Binding provides specifications to convert JSON information into or from Java classes;


  • Java Architecture for XML Binding allows mapping XML into Java objects;


  • Java API for XML Web Services can be used to create SOAP web services.



Enterprise specifications



  • Contexts and Dependency Injection is a specification to provide a depencency injection container, as in Spring;


  • Enterprise JavaBean (EJB) specification defines a set of lightweight APIs that an object container (the EJB container) will support in order to provide transactions (using JTA), remote procedure calls (using RMI or RMI-IIOP), concurrency control, dependency injection and access control for business objects. This package contains the Enterprise JavaBeans classes and interfaces that define the contracts between the enterprise bean and its clients and between the enterprise bean and the ejb container.


  • Java Persistence API are specifications about object-relational mapping between relation database tables and Java classes.


  • Java Transaction API contains the interfaces and annotations to interact with the transaction support offered by Java EE. Even though this API abstracts from the really low-level details, the interfaces are also considered somewhat low-level and the average application developer in Java EE is either assumed to be relying on transparent handling of transactions by the higher level EJB abstractions, or using the annotations provided by this API in combination with CDI managed beans.


  • Java Message Service provides a common way for Java programs to create, send, receive and read an enterprise messaging system's messages.



Other specifications



  • Validation: This package contains the annotations and interfaces for the declarative validation support offered by the Bean Validation API. Bean Validation provides a unified way to provide constraints on beans (e.g. JPA model classes) that can be enforced cross-layer. In Java EE, JPA honors bean validation constraints in the persistence layer, while JSF does so in the view layer.


  • Batch Applications provides the means to run long running background tasks that possibly involve a large volume of data and which may need to be periodically executed.


  • Java EE Connector Architecture is a Java-based technology solution for connecting application servers and enterprise information systems (EIS) as part of enterprise application integration (EAI) solutions. This is a low-level API aimed at vendors that the average application developer typically does not come in contact with.



Web profile


In an attempt to limit the footprint of web containers, both in physical and in conceptual terms, the web profile was created, a subset of the Java EE specifications.
The Java EE web profile comprises the following:





















































































































Specification Java EE 6[10]
Java EE 7[3]
Java EE 8[5]
Servlet 3.0 3.1 4.0

JavaServer Pages (JSP)
2.2 2.3 2.3

Unified Expression Language (EL)
2.2 3.0 3.0
Debugging Support for Other Languages (JSR-45) 1.0 1.0 1.0

JavaServer Pages Standard Tag Library (JSTL)
1.2 1.2 1.2

JavaServer Faces (JSF)
2.0 2.2 2.3

Java API for RESTful Web Services (JAX-RS)
1.1 2.0 2.1

Java API for WebSocket (WebSocket)
n/a 1.0 1.1

Java API for JSON Processing (JSON-P)
n/a 1.0 1.1
Common Annotations for the Java Platform (JSR-250) 1.1 1.2 1.3

Enterprise JavaBeans (EJB)
3.1 Lite 3.2 Lite 3.2

Java Transaction API (JTA)
1.1 1.2 1.2

Java Persistence API (JPA)
2.0 2.1 2.2
Bean Validation 1.0 1.1 2.0
Managed Beans 1.0 1.0 1.0
Interceptors 1.1 1.2 1.2
Contexts and Dependency Injection for the Java EE Platform 1.0 1.1 2.0
Dependency Injection for Java 1.0 1.0 1.0


Certified referencing runtimes


Although by definition all Java EE implementations provide the same base level of technologies (namely, the Java EE spec and the associated APIs), they can differ considerably with respect to extra features (like connectors, clustering, fault tolerance, high availability, security, etc.), installed size, memory footprint, startup time, etc.

































































































































































































































































































































































Referencing runtime
Developer
Java EE 8 certified – Full
Java EE 8 certified – Web
Java EE 7 certified – Full
Java EE 7 certified – Web
Java EE 6 certified – Full
Official Oracle page for Java EE Compatibility.
Java EE 6 certified – Web
Java EE 5 certified
J2EE 1.4 certified
Licensing

GlassFish server Open Source Edition

Oracle
Yes v5.0[11]
Yes v5.0[11]
Yes v4.x[12]
Yes v4.x[12]
Yes v3.x and upward[13]
Yes v3.x Web Profile
Yes v2.1.x[13]


Free software
Oracle GlassFish Server

Oracle




Yes v3[14] based on the open source GlassFish application server

Yes Sun Java System Application Server v9.0
Yes Sun Java System Application Server v8.2

Proprietary software

Oracle WebLogic Server

Oracle


Yes 12.2.1[15]

Yes v12c[16]

Yes v10.3.5.0
Yes v9

Proprietary software

WildFly

Red Hat
Yes v14.x[11]
Yes v14.x[11]
Yes v8.1 [17]
Yes v8.0.0.Final
Yes v7.1[18]
Yes v6.0[19] and v7.0[20]
Yes v5.1[21][22]
Yes v4.x

Free software

JBoss Enterprise Application Platform

Red Hat


Yes v7.0[12]
Yes v7.0[12]
Yes v6.0[23]

Yes v5

Source is Free software

IBM WebSphere Application Server

IBM


Yes v9.x[11]
Yes v9.x[12]
Yes v8[24]

Yes v7
Yes

Proprietary software

IBM WebSphere Application Server Liberty

IBM
Yes v18.0.0.2[25]
Yes v18.0.0.2[25]
Yes v8.5.5.6[26][27]
Yes v8.5.5.6[12]

Yes v8.5.5[28]



Proprietary software

Open Liberty
IBM
Yes v18.0.0.2
Yes v18.0.0.2







Free software

IBM WebSphere Application Server Community Edition

IBM




Yes v3.0

Yes v2.1


Proprietary software

Apache Geronimo

Apache




Yes v3.0-beta-1[29][30]

Yes v2.0
Yes v1.0

Free software
JEUS

TmaxSoft


Yes v8

Yes v7[31][32]

Yes v6
Yes v5

Proprietary software
Cosminexus Application Server

Hitachi


Yes v10.0[11]

Yes v9[33]




Proprietary software

Fujitsu Interstage Application Server[34]

Fujitsu


Yes v12.0[11]

Yes v1 Azure/v10.1[35][36]

Yes


Proprietary software

WebOTX

NEC




Yes[37]

Yes


Proprietary software
BES Application Server
Baolande



Yes v9.5[12]





Apache TomEE[38][39]

Apache



No 7 (Java EE 7 like, but not certified[40])

Yes



Free software

Resin Server

Caucho





Yes v4.0[41]

Yes

Proprietary software

Siwpas

OW2





Yes v6.0[42]



Free software

JOnAS

OW2





Yes v5.3 rc1[43]
Yes
Yes

Free software

SAP NetWeaver

SAP





Yes v2.x[44]
Yes
Yes

Proprietary software

Oracle Containers for Java EE

Oracle






Yes


Proprietary software

Oracle iPlanet Web Server

Oracle







Yes Sun Java System Web Server

Proprietary software

Oracle Application Server 10g

Oracle







Yes

Proprietary software
Pramati Server

Pramati







Yes v5.0

Proprietary software
Trifork T4

Trifork







Yes

Proprietary software
Sybase Enterprise Application Server[45]

Sybase







Yes

Proprietary software


Code sample


The code sample shown below demonstrates how various technologies in Java EE 7 are used together to build a web form for editing a user.


In Java EE a (web) UI can be built using Servlet, JavaServer Pages (JSP), or JavaServer Faces (JSF) with Facelets. The example below uses JSF and Facelets. Not explicitly shown is that the input components use the Java EE Bean Validation API under the covers to validate constraints.


<html xmlns="http://www.w3.org/1999/xhtml" 
xmlns:h="http://xmlns.jcp.org/jsf/html" xmlns:f="http://xmlns.jcp.org/jsf/core">

<f:metadata>
<f:viewParam name="user_id" value="#{userEdit.user}" converter="#{userConvertor}" />
</f:metadata>

<h:body>

<h:messages />

<h:form>
<h:panelGrid columns="2">
<h:outputLabel for="firstName" value="First name" />
<h:inputText id="firstName" value="#{userEdit.user.firstName}" label="First name" />

<h:outputLabel for="lastName" value="Last name" />
<h:inputText id="lastName" value="#{userEdit.user.lastName}" label="Last name" />

<h:commandButton action="#{userEdit.saveUser}" value="Save" />
</h:panelGrid>
</h:form>

</h:body>
</html>


Example Backing Bean class


To assist the view, Java EE uses a concept called a "Backing Bean". The example below uses Contexts and Dependency Injection (CDI) and Enterprise JavaBean (EJB).


@Named
@ViewScoped
public class UserEdit {

private User user;

@Inject
private UserDAO userDAO;

public String saveUser() {
userDAO.save(this.user);
addFlashMessage("User " + this.user.getId() + " saved");

return "users.xhtml?faces-redirect=true";
}

public void setUser(User user) {
this.user = user;
}

public User getUser() {
return user;
}
}


Example Data Access Object class


To implement business logic, Enterprise JavaBean (EJB) is the dedicated technology in Java EE. For the actual persistence, JDBC or Java Persistence API (JPA) can be used. The example below uses EJB and JPA. Not explicitly shown is that JTA is used under the covers by EJB to control transactional behavior.


@Stateless
public class UserDAO {

@PersistenceContext
private EntityManager entityManager;

public void save(User user) {
entityManager.persist(user);
}

public void update(User user) {
entityManager.merge(user);
}

public List<User> getAll() {
return entityManager.createNamedQuery("User.getAll", User.class)
.getResultList();
}

}


Example Entity class


For defining entity/model classes Java EE provides the Java Persistence API (JPA), and for expressing constraints on those entities it provides the Bean Validation API. The example below uses both these technologies.


@Entity
public class User {

@Id
@GeneratedValue(strategy = IDENTITY)
private Integer id;

@Size(min = 2, message="First name too short")
private String firstName;

@Size(min = 2, message="Last name too short")
private String lastName;

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getFirstName() {
return firstName;
}

public void setFirstName(String firstName) {
this.firstName = firstName;
}

public String getLastName() {
return lastName;
}

public void setLastName(String lastName) {
this.lastName = lastName;
}

}


See also




  • Web container

  • Deployment descriptor

  • Java BluePrints

  • Sun Java System Portal Server

  • Java EE version history

  • Sun Community Source License

  • Java Research License



References





  1. ^ "Differences between Java EE and Java SE - Your First Cup: An Introduction to the Java EE Platform". Docs.oracle.com. 2012-04-01. Retrieved 2012-07-18..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}


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  18. ^ "JBoss AS 7.1.0.Final "Thunder" released - Java EE 6 Full Profile certified! | My Wiki | Planet JBoss Community". Planet.jboss.org. 2012-02-17. Retrieved 2012-07-18.


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  27. ^ "Java EE 7 has landed in WAS Liberty - WASdev". 25 June 2015.


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  29. ^ "Apache Geronimo : Index".


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External links







  • Jakarta EE


  • Goncalves, Antonio (2013). Beginning Java EE 7. Apress.


  • Gupta, Arun (2013). Java EE 7 Essentials. O’Reilly.

  • Oracle Technology Network's Java EE


  • Oracle's Java EE Compatibility page - Certified Java EE Compatible Implementations

  • Core J2EE Patterns

  • A short tutorial introducing beginning Java EE developers to the Java EE platform


  • Cloud Tutorial - Java EE in a Day Java EE Tutorial that embraces the use of a Cloud IDE to let you learn the fundamentals of Java EE in just one day









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