Java EE 與 雲端運算的展望

Java EE 7Reaching for the CloudLee Chuk Munnchuk-munn.lee@oracle.com

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Java EE 6 PlatformDecember 10, 2009

Great Tooling Support

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Java EE 6

What is New in Java EE 6?• Several new APIs• Web profile• Pluggability/extensibility• Dependency injection• Lots of improvements to existing API

New And Updated Components• EJB 3.1 (+Lite)• JPA 2.0• Servlet 3.0• JSF 2.0• JAX-RS 1.1• Bean Validation 1.0• DI 1.0• CDI 1.0• Connectors 1.6

• Managed Beans 1.0• Interceptors 1.1• JSP 2.2• EL 2.2• JSR-250 1.1• JASPIC 1.1• JACC 1.5• JAX-WS 2.2• JSR-109 1.3

Java EE 6 Web Profile

JSP 2.2JSTL 1.2

Servlet 3.0 · EL 2.2

DI 1.0 · CDI 1.0 · Interceptors 1.1 · JSR-250 1.1

Managed Beans 1.0 EJB 3.1 Lite

JPA 2.0 · JTA 1.1

Web container

extensionsCDI

extensions

JSF 2.0 Bea

n Valid

ation 1.0

Web Tier Updates• Annotations in Servlet 3.0• Automatic discovery and registration of libraries• web.xml is optional• Package static files in resource jars• Use EJBs directly inside web apps

Web Apps Simplified Packaging

WEB-INF/classes com/acme/MyServlet.class com/acme/MyFilter.class

WEB-INF/web.xml

index.htmlmain.cssjquery-1.4.2.jsui/jquery.ui.core.jsui/jquery.ui.widget.js

Web Application

WEB-INF/lib someframework.jar

Web Apps Simplified Packaging Web Application

@WebServlet(urlPatterns=”/foo”)public class MyServlet { … }

@WebFilter(urlPatterns=”/foo”)public class MyFilter { … }

WEB-INF/classes com/acme/MyServlet.class com/acme/MyFilter.class

WEB-INF/web.xml

index.htmlmain.cssjquery-1.4.2.jsui/jquery.ui.core.jsui/jquery.ui.widget.js

WEB-INF/lib someframework.jar

Web Apps Simplified Packaging

WEB-INF/classes com/acme/MyServlet.class com/acme/MyFilter.class

index.htmlmain.cssjquery-1.4.2.jsui/jquery.ui.core.jsui/jquery.ui.widget.js

Web Application

WEB-INF/lib someframework.jar

META-INF/web-fragment.xmlcom/fw/FwServlet.classcom/fw/FwFilter.class

Framework Jar

Web Apps Simplified Packaging

WEB-INF/classes com/acme/MyServlet.class com/acme/MyFilter.class

index.htmlmain.css

Web Application

WEB-INF/lib someframework.jar jquery-ui-1.8.4.jar META-INF/resources/jquery-1.4.2.js

META-INF/resources/ui/jquery.ui.core.jsMETA-INF/resources/ui/jquery.ui.widget.js

jQuery Resource Jar

Web Apps Simplified Packaging

WEB-INF/classes com/acme/MyServlet.class com/acme/MyFilter.class

index.htmlmain.css

Web Application

WEB-INF/lib someframework.jar jquery-ui-1.8.4.jar

• Self-contained• Generic• Reusable

Java EE 6 Programming Model• Complementary declarative/programmatic layer• Annotations are additive• Code can evolve gradually• Managed beans as a common foundation

EJB 3.1 Lite• Session bean programming model• Stateless, singleton programming model• Annotation based declarative security and

transactions• Deployment descriptors are optional

EJB 3.1 New First Class Construct

@Singleton @Startuppublic class StartupBean { @PostConstruct public void doAtStartup() { … }}

@Stateless public class BackupBean { @Schedule(dayOfWeek=”Fri”, hour=”3”, minute=”15”) public void performBackup() { … }}

@Stateless public class BatchProcessor { @Asynchronous public Future<Result> submit(Task t){ … }}

Dependency Injection • Powerful type-safe model• Can be enabled per-module• Integrated with JSF, JSP, EJB, web tier• Friendly to pre-Java EE 6 resources and services• Event model• Highly extensible

Bean with Constructor Injection

@RequestScopedpublic class CheckoutHandler { @Inject public CheckoutHandler( @LoggedIn User user, @Reliable @PayBy(CREDIT_CARD) PaymentProcessor processor, @Default ShoppingCart cart) {…}

Bean with Constructor Injection

@RequestScopedpublic class CheckoutHandler { @Inject public CheckoutHandler( @LoggedIn User user, @Reliable @PayBy(CREDIT_CARD) PaymentProcessor processor, @Default ShoppingCart cart) {…}

Types

Bean with Constructor Injection

@RequestScopedpublic class CheckoutHandler { @Inject public CheckoutHandler( @LoggedIn User user, @Reliable @PayBy(CREDIT_CARD) PaymentProcessor processor, @Default ShoppingCart cart) {…}

Qualifiers

Bean with Constructor Injection

@RequestScopedpublic class CheckoutHandler { @Inject public CheckoutHandler( @LoggedIn User user, @Reliable @PayBy(CREDIT_CARD) PaymentProcessor processor, @Default ShoppingCart cart) {…}

Request scoped

Bean with Constructor Injection

@RequestScopedpublic class CheckoutHandler { @Inject public CheckoutHandler( @LoggedIn User user, @Reliable @PayBy(CREDIT_CARD) PaymentProcessor processor, @Default ShoppingCart cart) {…}

Session scoped

Bean with Constructor Injection

@RequestScopedpublic class CheckoutHandler { @Inject public CheckoutHandler( @LoggedIn User user, @Reliable @PayBy(CREDIT_CARD) PaymentProcessor processor, @Default ShoppingCart cart) {…}

Application scoped

Bean with Constructor Injection

@RequestScopedpublic class CheckoutHandler { @Inject public CheckoutHandler( @LoggedIn User user, @Reliable @PayBy(CREDIT_CARD) PaymentProcessor processor, @Default ShoppingCart cart) {…}

Conversation scoped

Java EE 7Java EE 7Cloudy AheadCloudy Ahead

Layers of Cloud

Software as a Service (SaaS)

Platform as a Service (PaaS)

Infrastructure as a Service (IaaS)

Java EE and the Cloud• Containers are back in vogue!• We have containers• We have services... injectable services...• We scale to large clusters...• We have a security model...

JSR 342 – Java EE for the Cloud• More easily operate on public/private cloud

– Multi tenancy, elasticiy

• Tighter requirements for resource and state management

• Better isolation between applications• Potential standard APIs for NRDBMS, caching, etc.• Common management and monitoring interfaces• Evolving the platform

Better Packaging for the Cloud• Applications should be versioned• Multiple versions should be able to coexists• Dealing with data versioning, upgrades, etc.• Need the ability to specify QoS properties• Exposed and connected to services

Cloud Platform

Application

Virtualization Layer

State Management

JavaService

PersistenceService

QueueingService ...

Cloud Platform

Application

Virtualization Layer

State Management

JavaService

PersistenceService

QueueingService ...

CodeModule

CodeModule Schema Migration QoS

InformationSecurityCodeModule …

Cloud Platform

Virtualization Layer

State Management

JavaService

PersistenceService

QueueingService ...

Application Application Application Application Application

Cloud Platform

Virtualization Layer

State Management

JavaService

PersistenceService

QueueingService ...

Application Application Application Application Application

Managed Environment

Modularity• Build on JavaSE 8 modularity• Applications are composed of modules• Dependencies are explicit• Versioning is built-in• Additional metadata for JavaEE

JavaSE 8 Modulescom.foo.app

org.bar.lib

com.foo.lib

edu.baz.util

com.foo.extramodule com.foo @ 1.0.0 {class com.foo.app.Mainrequires com.foo.lib @ 2.1-alpha;provides com.foo.app.lib @ 1.0.0;requires optional com.foo.extra;

}

module-info.java

Packaging and Install

$ javac -modulepath mods src/com.foo.app/...

$ jpkg -modulepath mods jmod \com.foo.app com.foo.extra com.foo.lib

$ jmod -L mlib install \ $EXT/edu.baz.util@*.jmod \ $EXT/org.bar.lib@*.jmod

• Compiling Java classes with modules

• Packaging classes into modules

• Installing modules into library

Modular Applicationsj1demo.app

j1demo-1.0.3

Modular Applicationsj1demo.app

j1demo-1.0.3twitter-client-2.3.0

j1demo-persist-1.4.0requires

Modular Applicationsj1demo.app

j1demo-1.0.3twitter-client-2.3.0

j1demo-persist-1.4.0

javaee-web-7.0 jpa-2.1 jax-rs-2.0

Modular Applicationsj1demo.app

j1demo-1.0.3twitter-client-2.3.0

j1demo-persist-1.4.0

javaee-web-7.0 jpa-2.1 jax-rs-2.0

implements

...

gf-appserv-4.01.

Modular Applicationsj1demo.app

j1demo-1.0.3twitter-client-2.3.0

j1demo-persist-1.4.0

javaee-web-7.0 jpa-2.1 jax-rs-2.0

implements

...

gf-appserv-4.01. eclipselink-2.1.3

jersey-2.0.5

Modular Applicationsj1demo.app

j1demo-1.0.3twitter-client-2.3.0

j1demo-persist-1.4.0

javaee-web-7.0 jpa-2.1

...

gf-appserv-4.01. eclipselink-2.1.3

jax-rs-2.1

jersey-2.1.1

Modular Applicationsj1demo.app

j1demo-1.0.3twitter-client-2.3.0

j1demo-persist-1.4.0

javaee-web-7.0 jpa-2.1

...

gf-appserv-4.01. eclipselink-2.1.3

jax-rs-2.1

jersey-2.1.1

jax-rs-2.1

jersey-2.1.1

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Status

Web Tier • Web socket support in Servlet container• Standard JSON API• HTML5 support in JSF• NIO2 based web container• Updates to Web Profile• JAX-RS 2.0 will be mandatory

New API • Concurrency Utilities – JSR 236

– Eg. transaction-, security- naming- aware ExecutorService

• JCache – JSR 107– Local cache API, key-value map– Needs to be aligned with JPA cache API

• JMS 2.0– Annotation based programming model to JMS

• JSON 1.0• RESTful client API for JAX-RS 2.0

Java EE 7 JSRs StatusApproved

• JPA 2.1• JAX-RS 2.0• Servlet 3.1• EL 3.0• Platform 7/Web Profile 7• JMS 2.0• JSF 2.2

Ongoing• Concurrency Utilities 1.0• JCache 1.0

Yet to be filed• EJB 3.2• CDI 1.1• JSR-330 1.1• Bean Validation 1.1• JSON 1.0

Java EE 7 Schedule• First seven JSRs already filed• Remaining ones to be filed soon...

– Stay tuned

• Final release late 2012• Date driven release

– Anything not ready will be deferred to Java EE 8

JavaEE 6 on the Cloud Today

JRockit Virtualized Edition• Oracle JRockit VE runs

natively on hypervisor– Better performance– Improved security

• Deterministic GC behaviour– “Soft” real-time

• Simple administration– Console and scripting

Java EE 6 Platform

Available fromhttp://www.oracle.com/javaee

Java EE 7Reaching for the CloudLee Chuk Munnchuk-munn.lee@oracle.com