Jakarta EE

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Jakarta EE
Jakarta EE logo schooner color stacked default
Player softwareJava
Programming language(s)Java
Application(s)Application server
StatusActive
LicenseEclipse Public License or GNU General Public License w/Classpath exception
Websitejakarta.ee

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

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

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

History[edit]

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.

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.[3] The Eclipse top-level project has been named Eclipse Enterprise for Java (EE4J).[4] The Eclipse Foundation could not agree with Oracle over the use of javax and Java trademarks.[5] Oracle owns the trademark for the name "Java" and the platform was renamed from Java EE to Jakarta EE.[6][7] The name refers to the largest city on the island of Java and also the capital of Indonesia, Jakarta.[8] The name should not be confused with the former Jakarta Project which fostered a number of current and former Java projects at the Apache Software Foundation.

Java enterprise platform history
Platform version Release Specification Java SE Support Important Changes
Jakarta EE 11 Planned for June/July 2024 11 Java SE 21
Jakarta EE 10 2022-09-13[9] 10
  • Java SE 17
  • Java SE 11
Removal of deprecated items in Servlet, Faces, CDI and EJB (Entity Beans and Embeddable Container). CDI-Build Time.
Jakarta EE 9.1 2021-05-25[10] 9.1
  • Java SE 11
  • Java SE 8
JDK 11 support
Jakarta EE 9 2020-12-08[11] 9 Java SE 8 API namespace move from javax to jakarta
Jakarta EE 8 2019-09-10[12] 8 Java SE 8 Full compatibility with Java EE 8
Java EE 8 2017-08-31 JSR 366 Java SE 8 HTTP/2 and CDI based Security
Java EE 7 2013-05-28 JSR 342 Java SE 7 WebSocket, JSON and HTML5 support
Java EE 6 2009-12-10 JSR 316 Java SE 6 CDI managed Beans and REST
Java EE 5 2006-05-11 JSR 244 Java SE 5 Java annotations
J2EE 1.4 2003-11-11 JSR 151 J2SE 1.4 WS-I interoperable web services[13]
J2EE 1.3 2001-09-24 JSR 58 J2SE 1.3 Java connector architecture[14]
J2EE 1.2 1999-12-17 1.2 J2SE 1.2 Initial specification release

Specifications[edit]

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

Web specifications[edit]

  • Jakarta Servlet: defines how to manage HTTP requests, in a synchronous or asynchronous way. It is low level and other Jakarta EE specifications rely on it;
  • Jakarta WebSocket: API specification that defines a set of APIs to service WebSocket connections;
  • Jakarta Faces: a technology for constructing user interfaces out of components;
  • Jakarta Expression Language (EL) is a simple language originally designed to satisfy the specific needs of web application developers. It is used specifically in Jakarta Faces to bind components to (backing) beans and in Contexts and Dependency Injection to named beans, but can be used throughout the entire platform.

Web service specifications[edit]

Enterprise specifications[edit]

  • Jakarta Activation (JAF) specifies an architecture to extend component Beans by providing data typing and bindings of such types.
  • Jakarta Contexts and Dependency Injection (CDI) is a specification to provide a dependency injection container;
  • Jakarta Enterprise Beans (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 Jakarta Enterprise Beans classes and interfaces that define the contracts between the enterprise bean and its clients and between the enterprise bean and the ejb container.
  • Jakarta Persistence (JPA) are specifications about object-relational mapping between relation database tables and Java classes.
  • Jakarta Transactions (JTA) contains the interfaces and annotations to interact with the transaction support offered by Jakarta 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 Jakarta 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.
  • Jakarta Messaging (JMS) provides a common way for Java programs to create, send, receive and read an enterprise messaging system's messages.

Other specifications[edit]

  • 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 Jakarta EE, JPA honors bean validation constraints in the persistence layer, while JSF does so in the view layer.
  • Jakarta Batch provides the means for batch processing in applications to run long running background tasks that possibly involve a large volume of data and which may need to be periodically executed.
  • Jakarta Connectors is a Java-based tool for connecting application servers and enterprise information systems (EIS) as part of enterprise application integration (EAI). This is a low-level API aimed at vendors that the average application developer typically does not come in contact with.

Web profile[edit]

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 Jakarta EE specifications. The Jakarta EE web profile comprises the following:

Specification Java EE 6[15] Java EE 7[16] Java EE 8[17]
Jakarta EE 8[18]
Jakarta EE 9[19]
Jakarta EE 9.1[20]
Jakarta EE 10[21]
Jakarta Servlet 3.0 3.1 4.0 5.0 6.0
Jakarta Server Pages (JSP) 2.2 2.3 2.3 3.0 3.1
Jakarta Expression Language (EL) 2.2 3.0 3.0 4.0 5.0
Jakarta Debugging Support for Other Languages (JSR-45) 1.0 1.0 1.0 2.0 2.0
Jakarta Standard Tag Library (JSTL) 1.2 1.2 1.2 2.0 3.0
Jakarta Faces 2.0 2.2 2.3 3.0 4.0
Jakarta RESTful Web Services (JAX-RS) 1.1 2.0 2.1 3.0 3.1
Jakarta WebSocket (WebSocket) 1.0 1.1 2.0 2.1
Jakarta JSON Processing (JSON-P) 1.0 1.1 2.0 2.1
Jakarta JSON Binding (JSON-B) 1.1 2.0 3.0
Jakarta Annotations (CA) 1.1 1.2 1.3 2.0 2.1
Jakarta Enterprise Beans (EJB) 3.1 Lite 3.2 Lite 3.2 Lite 4.0 Lite 4.0 Lite
Jakarta Transactions (JTA) 1.1 1.2 1.2 2.0 2.0
Jakarta Persistence (JPA) 2.0 2.1 2.2 3.0 3.1
Jakarta Bean Validation 1.0 1.1 2.0 3.0 3.0
Jakarta Managed Beans 1.0 1.0 1.0 2.0
Jakarta Interceptors 1.1 1.2 1.2 2.0 2.1
Jakarta Contexts and Dependency Injection (CDI) 1.0 1.1 2.0 3.0 4.0
Jakarta Dependency Injection 1.0 1.0 1.0 2.0 2.0
Jakarta Security 1.0 2.0 3.0
Jakarta Authentication 1.0 1.1 2.0 3.0
Jakarta Concurrency 3.0

Certified referencing runtimes[edit]

Although by definition all Jakarta EE implementations provide the same base level of technologies (namely, the Jakarta 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.

Jakarta EE[22][23][24][edit]

Referencing runtime Developer Jakarta EE 10 Platform Jakarta EE 9/9.1 Platform Compatible Products Jakarta EE 9/9.1 Web Profile Compatible Products Jakarta EE 8 Platform Compatible Products Jakarta EE 8 Web Profile Compatible Products Licensing
GlassFish Eclipse Yes 7.0.0 Yes 6.0.0/ 6.1.0 Yes 6.0.0/ 6.1.0 Yes 5.1.0 Yes 5.1.0 Free software
Open Liberty IBM Yes 22.0.0.13-beta,[25] 23.0.0.3[26] Yes 21.0.0.12 Yes 21.0.0.12 Yes 19.0.0.6, 20.0.0.3 Yes 19.0.0.6, 20.0.0.3 Free software
WebSphere Liberty IBM Yes 23.0.0.3[26] Yes 21.0.0.12 Yes 21.0.0.12 Yes 20.0.0.3 Yes 20.0.0.3 Proprietary software
WildFly Red Hat Yes 27.0.0.Alpha5 Yes 23.0.1-Preview/25.0.0-Preview Yes 23.0.1-Preview/25.0.0-Preview Yes 18.0.0 Yes 18.0.0 Free software
JBoss EAP Red Hat No No No Yes 7.3.0 Yes 7.3.0 Free software
TomEE Apache No No Yes 9.0.0-M7[27] No Yes 8.0.x Free software
Payara Server Payara Services Limited Yes 6.2022.1 Alpha 4 Yes 6.2021.1 Alpha 1 No Yes 5.22.0, 5.23.0 Yes 5.23.0 Free software
Thunisoft Application Server Beijing Thunisoft Information Technology No Yes 3.0 No Yes 2.8 No Proprietary software
JEUS TmaxSoft No No No Yes 8.5 No Proprietary software
InforSuite Application Server Shandong Cvicse Middleware No Yes 11 No Yes 10 No Proprietary software

Java EE[edit]

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[28] Yes v5.0[28] Yes v4.x[29] Yes v4.x[29] Yes v3.x and upward[30] Yes v3.x Web Profile Yes v2.1.x[30] Free software
Oracle GlassFish Server Oracle Yes v3[31] 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 14.1.1[32] Yes 12.2.1[33] Yes v12c[34] Yes v10.3.5.0 Yes v9 Proprietary software
WildFly Red Hat Yes v14.x[28] Yes v14.x[28] Yes v8.1 [35] Yes v8.0.0.Final Yes v7.1[36] Yes v6.0[37] and v7.0[38] Yes v5.1[39][40] Yes v4.x Free software
JBoss Enterprise Application Platform Red Hat Yes v7.2 [41] Yes v7.0[29] Yes v7.0[29] Yes v6.0[42] Yes v5 Proprietary software
IBM WebSphere Application Server IBM Yes v9.x[28] Yes v9.x[29] Yes v8[43] Yes v7 Yes Proprietary software
IBM WebSphere Application Server Liberty IBM Yes v18.0.0.2[44] Yes v18.0.0.2[44] Yes v8.5.5.6[45][46] Yes v8.5.5.6[29] Yes v8.5.5[47] 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[48][49] Yes v2.0 Yes v1.0 Free software
JEUS TmaxSoft Yes v8 Yes v7[50][51] Yes v6 Yes v5 Proprietary software
Cosminexus Application Server Hitachi Yes v10.0[28] Yes v9[52] Proprietary software
Fujitsu Interstage Application Server[53] Fujitsu Yes v12.0[28] Yes v1 Azure/v10.1[54][55] Yes Proprietary software
WebOTX NEC Yes[56] Yes Proprietary software
BES Application Server Baolande Yes v9.5[29]
Apache TomEE[57][58] Apache No 7 (Java EE 7 like, but not certified[59]) Yes Free software
Resin Server Caucho Yes v4.0[60] Yes Proprietary software
Siwpas OW2 Yes v6.0[61] Free software
JOnAS OW2 Yes v5.3 rc1[62] Yes Yes Free software
SAP NetWeaver SAP Yes v2.x[63] 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 Technologies Yes v5.0 Proprietary software
Trifork T4 Trifork Yes Proprietary software
Sybase Enterprise Application Server[64] Sybase Yes Proprietary software

Code sample[edit]

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 Jakarta EE a (web) UI can be built using Jakarta Servlet, Jakarta Server Pages (JSP), or Jakarta Faces (JSF) with Facelets. The example below uses Faces and Facelets. Not explicitly shown is that the input components use the Jakarta 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[edit]

To assist the view, Jakarta EE uses a concept called a "Backing Bean". The example below uses Contexts and Dependency Injection (CDI) and Jakarta Enterprise Beans (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[edit]

To implement business logic, Jakarta Enterprise Beans (EJB) is the dedicated technology in Jakarta EE. For the actual persistence, JDBC or Jakarta Persistence (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[edit]

For defining entity/model classes Jakarta EE provides the Jakarta Persistence (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[edit]

References[edit]

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External links[edit]