291 lines
9.0 KiB
XML
291 lines
9.0 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<chapter id="new-in-3">
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<title>What's new in Spring 3.0?</title>
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<para>If you have been using the Spring Framework for some time, you will be
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aware that Spring has undergone two major revisions: Spring 2.0, released in
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October 2006, and Spring 2.5, released in November 2007. It is now time for
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a third overhaul resulting in Spring 3.0.</para>
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<sidebar id="new-in-3-intro-java">
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<title>Java SE and Java EE Support</title>
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<para>The Spring Framework is now based on Java 5 and Java 6 is fully
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supported.</para>
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<para>Furthermore, Spring is compatible with J2EE 1.4 and Java EE 5, while
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at the same time introducing some early support for Java EE 6.</para>
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</sidebar>
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<section id="new-in-3-intro">
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<title>Java 5</title>
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<para>The entire framework code has been revised to take advantage of Java
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5 features like generics, varargs and other language improvements. We have
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done our best to still keep the code backwards compatible. We now have
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consistent use of generic Collections and Maps, consistent use of
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generified FactoryBeans, and also consistent resolution of bridge methods
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in the Spring AOP API. Generified ApplicationListeners automatically
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receive specific event types only. All callback interfaces such as
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TransactionCallback and HibernateCallback declare a generic result value
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now. Overall, the Spring core codebase is now freshly revised and
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optimized for Java 5.</para>
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<para>Spring's TaskExecutor abstraction has been updated for close
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integration with Java 5's java.util.concurrent facilities. We provide
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first-class support for Callables and Futures now, as well as
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ExecutorService adapters, ThreadFactory integration, etc. This has been
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aligned with JSR-236 (Concurrency Utilities for Java EE 6) as far as
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possible. Furthermore, we provide support for asynchronous method
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invocations through the use of the new @Async annotation (or EJB 3.1's
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@Asynchronous annotation).</para>
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</section>
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<section id="new-in-3-improved-docs">
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<title>Improved documentation</title>
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<sidebar id="new-in-3-intro-work-in-progress">
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<title>Note:</title>
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<para>The current documentation is a <emphasis>*** WORK IN PROGRESS
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***</emphasis> and is currently being re-written to reflect all the
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changes in the framework and from now relying on Java 5 features.</para>
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</sidebar>
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<para>The Spring reference documentation has also substantially been
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updated to reflect all of the changes and new features for Spring 3.0.
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While every effort has been made to ensure that there are no errors in
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this documentation, some errors may nevertheless have crept in. If you do
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spot any typos or even more serious errors, and you can spare a few cycles
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during lunch, please do bring the error to the attention of the Spring
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team by <ulink url="http://jira.springframework.org/">raising an
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issue</ulink>.</para>
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</section>
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<section id="new-in-3-modules-build">
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<title>New module organization and build system</title>
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<para>The framework modules have been revised and are now managed
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separately with one source-tree per module jar:</para>
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<itemizedlist>
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<listitem>
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<para>org.springframework.aop</para>
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</listitem>
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<listitem>
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<para>org.springframework.beans</para>
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</listitem>
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<listitem>
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<para>org.springframework.context</para>
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</listitem>
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<listitem>
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<para>org.springframework.context.support</para>
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</listitem>
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<listitem>
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<para>org.springframework.expression</para>
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</listitem>
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<listitem>
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<para>org.springframework.instrument</para>
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</listitem>
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<listitem>
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<para>org.springframework.jdbc</para>
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</listitem>
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<listitem>
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<para>org.springframework.jms</para>
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</listitem>
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<listitem>
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<para>org.springframework.orm</para>
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</listitem>
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<listitem>
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<para>org.springframework.oxm</para>
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</listitem>
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<listitem>
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<para>org.springframework.test</para>
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</listitem>
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<listitem>
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<para>org.springframework.transaction</para>
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</listitem>
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<listitem>
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<para>org.springframework.web</para>
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</listitem>
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<listitem>
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<para>org.springframework.web.portlet</para>
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</listitem>
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<listitem>
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<para>org.springframework.web.servlet</para>
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</listitem>
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</itemizedlist>
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<sidebar id="new-in-3-intro-spring-jar">
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<title>Note:</title>
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<para>The spring.jar artifact that contained almost the entire framework
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is no longer provided.</para>
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</sidebar>
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<para>We are now using a new Spring build system as known from Spring Web
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Flow 2.0. This gives us:</para>
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<itemizedlist>
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<listitem>
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<para>Ivy-based "Spring Build" system</para>
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</listitem>
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<listitem>
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<para>consistent deployment procedure</para>
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</listitem>
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<listitem>
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<para>consistent dependency management</para>
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</listitem>
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<listitem>
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<para>consistent generation of OSGi manifests</para>
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</listitem>
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</itemizedlist>
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</section>
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<section id="new-in-3-features-overview">
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<title>Overview of new features</title>
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<para>This is a list of new features for Spring 3.0. We will cover these
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features in more detail in the following sections.</para>
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<itemizedlist>
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<listitem>
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<para>Spring Expression Language</para>
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</listitem>
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<listitem>
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<para>IoC enhancements/Spring JavaConfig</para>
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</listitem>
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<listitem>
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<para>Comprehensive REST support</para>
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</listitem>
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<listitem>
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<para>@MVC additions</para>
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</listitem>
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<listitem>
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<para>Declarative model validation</para>
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</listitem>
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<listitem>
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<para>Early support for Java EE 6</para>
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</listitem>
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</itemizedlist>
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</section>
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<section id="new-feature-java5">
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<title>Core APIs updated for Java 5</title>
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<para>BeanFactoryinterface returns typed bean
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instancesas far as possible
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<itemizedlist>
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<listitem>T getBean(Stringname, Class<T> requiredType)</listitem>
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<listitem>Map<String, T> getBeansOfType(Class<T> type)</listitem>
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</itemizedlist>
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</para>
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<para>Spring's TaskExecutorinterface extends
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<classname>java.util.concurrent.Executor</classname> now
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<itemizedlist>
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<listitem>extended AsyncTaskExecutor supports standard Callables with Futures</listitem>
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</itemizedlist>
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</para>
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<para>New Java 5 based converter API and SPI
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<itemizedlist>
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<listitem>stateless ConversionService and Converters</listitem>
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</itemizedlist>
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<itemizedlist>
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<listitem>superseding standard JDK PropertyEditors</listitem>
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</itemizedlist>
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</para>
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<para>Typed ApplicationListener<E>
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</para>
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</section>
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<section id="new-feature-el">
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<title>Spring Expression Language</title>
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<para>Spring introduces an expression language which is similar to Unified
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EL in its syntax but offers significantly more features. The expression
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language can be used when defining XML and Annotation based bean
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definitions and also serves as the foundation for expression language
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support across the Spring portfolio. Details of this new functionality can
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be found in the chapter <link linkend="expressions">Spring Expression
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Language (SpEL).</link></para>
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<para>The Spring Expression Language was created to provide the Spring community with a single well
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supported expression language that can used across all the products in the Spring portfolio. Its language
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features are driven by the requirements of the projects in the Spring portfolio, including tooling
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requirements for code completion support within the eclipse based SpringSource Tool Suite.</para>
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<para>The following is an example of how the Expression Language can be used to configure some properties
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of a database setup
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<programlisting language="xml"><![CDATA[
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<bean class="mycompany.RewardsTestDatabase">
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<property name="databaseName"
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value="“#{systemProperties.databaseName}”/>
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<property name="keyGenerator"
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value="“#{strategyBean.databaseKeyGenerator}”/>
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</bean>
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]]></programlisting>
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</para>
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</section>
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<section id="new-feature-java-config">
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<title>The Inversion of Control (IoC) container</title>
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<para>Core JavaConfig features added</para>
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</section>
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<section id="new-feature-rest">
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<title>The Web Tier</title>
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<para>Work in progress</para>
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<section>
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<title>Comprehensive REST support</title>
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<para>Work in progress</para>
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</section>
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<section>
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<title>@MVC additions</title>
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<para>Work in progress</para>
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</section>
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</section>
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<section id="new-feature-validation">
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<title>Declarative model validation</title>
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<para>Hibernate Validator, JSR 303</para>
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</section>
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<section id="new-feature-jee-6">
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<title>Early support for Java EE 6</title>
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<para>JSF 2.0, JPA 2.0, etc</para>
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</section>
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</chapter> |