Java EE 與雲端運算的展望

Java EE 7
Reaching for the Cloud
Lee Chuk Munn
chuk-munn.lee@oracle.com

The following is intended to outline our general
product direction. It is intended for information
purposes only, and may not be incorporated
into any contract. It is not a commitment to
deliver any material, code, or functionality, and
should not be relied upon in making purchasing
decisions.

The development, release, and timing of any
features or functionality described for Oracle's
products remains at the sole discretion of
Oracle.

Java EE 6 Platform
December 10, 2009

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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) • Managed Beans 1.0
• JPA 2.0 • Interceptors 1.1
• Servlet 3.0 • JSP 2.2
• JSF 2.0 • EL 2.2
• JAX-RS 1.1 • JSR-250 1.1
• Bean Validation 1.0 • JASPIC 1.1
• DI 1.0 • JACC 1.5
• CDI 1.0 • JAX-WS 2.2
• Connectors 1.6 • JSR-109 1.3

Java EE 6 Web Profile

Web container JSP 2.2
extensions
JSF 2.0 JSTL 1.2
CDI

Bean Validation 1.0
extensions
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 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 Application
WEB-INF/classes
com/acme/MyServlet.class
com/acme/MyFilter.class
WEB-INF/lib
someframework.jar
WEB-INF/web.xml

index.html
main.css
jquery-1.4.2.js
ui/jquery.ui.core.js
ui/jquery.ui.widget.js

Web Application
WEB-INF/classes @WebServlet(urlPatterns=”/foo”)
com/acme/MyServlet.class public class MyServlet { … }
WEB-INF/lib @WebFilter(urlPatterns=”/foo”)
someframework.jar public class MyFilter { … }
WEB-INF/web.xml

index.html
main.css
jquery-1.4.2.js

Web Application
WEB-INF/classes
com/acme/MyFilter.class Framework Jar
WEB-INF/lib META-INF/web-fragment.xml
someframework.jar com/fw/FwServlet.class
com/fw/FwFilter.class

index.html
main.css
jquery-1.4.2.js

Web Application
WEB-INF/classes
WEB-INF/lib
someframework.jar
jQuery Resource Jar
jquery-ui-1.8.4.jar META-INF/resources/jquery-1.4.2.js
META-INF/resources/ui/jquery.ui.core.js
META-INF/resources/ui/jquery.ui.widget.js
index.html
main.css

Web Application • Self-contained

WEB-INF/classes • Generic
com/acme/MyServlet.class • Reusable
WEB-INF/lib
someframework.jar
jquery-ui-1.8.4.jar

index.html
main.css

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 @Startup
public 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

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


@RequestScoped
@Inject
Types


@RequestScoped
@Inject
Qualifiers

Request scoped
@RequestScoped
@Inject


@RequestScoped
@Inject
Session scoped PaymentProcessor processor,


@RequestScoped
@Inject
Application
scoped


@RequestScoped
@Inject

Conversation scoped

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

Java Persistence Queueing
Service Service Service
...

State Management

Virtualization Layer

Cloud Platform

Application
Code Code Code QoS
Module Module Module
Schema Migration Security
Information …

...

State Management


Cloud Platform

Application Application Application Application Application

...

State Management


Cloud Platform

Managed Environment

Application Application Application Application Application

...

State Management


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

JavaSE 8 Modules
com.foo.app
module-info.java
module com.foo @ 1.0.0 { com.foo.extra
class com.foo.app.Main
requires com.foo.lib @ 2.1-alpha; com.foo.lib
provides com.foo.app.lib @ 1.0.0;
requires optional com.foo.extra;
}

org.bar.lib

edu.baz.util

Packaging and Install
• Compiling Java classes with modules

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

• Packaging classes into modules

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

• Installing modules into library

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

Modular Applications
j1demo.app
j1demo-1.0.3

j1demo.app twitter-client-2.3.0
j1demo-1.0.3
requires j1demo-persist-1.4.0

j1demo-1.0.3
j1demo-persist-1.4.0

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

j1demo-1.0.3


implements

gf-appserv-4.01.

...

j1demo-1.0.3


implements

gf-appserv-4.01. eclipselink-
2.1.3

... jersey-2.0.5

j1demo.app twitter-client-2.3.0 jax-rs-2.1
j1demo-1.0.3
j1demo-persist-1.4.0 jersey-2.1.1

javaee-web-7.0 jpa-2.1

2.1.3

...

j1demo.app twitter-client-2.3.0 jax-rs-2.1
j1demo-1.0.3
j1demo-persist-1.4.0 jersey-2.1.1


2.1.3

... 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 Status
Approved Ongoing
• JPA 2.1 • Concurrency Utilities 1.0
• JAX-RS 2.0 • JCache 1.0
• Servlet 3.1
• EL 3.0 Yet to be filed
• Platform 7/Web Profile 7 • EJB 3.2
• JMS 2.0 • CDI 1.1
• JSF 2.2 • 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

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 from
http://www.oracle.com/javaee

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