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Spring 3.1 Features Worth Knowing About (Available For Download Today)

Rossen Stoyanchev, Software Engineer

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Environment

Java Configuration DSL

Cache Abstraction

Agenda

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Moving an Application Across Environments

DATA SOURCE

TRANSFER SERVICE

ACCOUNT DAO

DEV

QA

PROD

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Environment-Specific Properties In XML

dev/database.properties

qa/database.properties

prod/database.propertiesjava -DENV=prod ...

Property Source:dev/database.properties

Property Source: Java system property

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Environment-Specific Properties In Java

Property Source: Java system property?

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Spring EL Expressions in Spring 3.0

Easier to see where properties originate from

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What About “Structural” Differences ?

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prod/database-context.xml

dev/database-context.xml

app-context.xml

Environment-Specific Configuration in XML

Choose from multiple files to accommodate differences

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Environment-Specific Configuration in Java

Accommodate differences in code

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A concrete representation with two key aspects

• Property Sources

• Bean Profiles

Bean Profile:

A logical group of bean definitions. Registered only if the profile is active.

Property Source:

A variety of sources: property files, system properties, servlet context, JNDI, etc.

Spring 3.1 “Environment” Abstraction

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In standalone code

In a Web application

• Implement ApplicationContextInitializer

• Register via contextInitializerClasses context parameter in web.xml

Default property sources

• JVM properties

• System envrionment variables

Managing Property Sources

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In standalone code

Via @Autowired or EnvironmentAware interface

In configuration (via placeholders)

<context:property-placeholder/> also now falls back on Environment property sources

Accessing Environment Properties

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Assign all beans to profile

Assign enclosed beans to a profile

Beans Profiles With XML

Multiple profiles can be listed

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Bean Profiles In Java

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In code

In Web applications

Bean Profile Activation

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Environment

Java Configuration DSL

Cache Abstraction

Agenda

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Custom XML namespaces have become very popular

• In Spring and in other frameworks

Succinct and highly expressive

Each namespace element can result in the registration of any number of bean definitions

Question:

How do get the same benefits in Java configuration?

Custom XML Namespaces

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Java configuration equivalent to an XML namespace

Declared in @FeatureConfiguration classes

Results in same bean declarations as <tx:annotation-driven />

Feature Specifications

Beans declared elsewhere can be autowired in.

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FeatureSpecifications Are Designed For Ease of Use

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Environment

Java Configuration DSL

Cache Abstraction

Agenda

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CacheManager and Cache abstractions

• org.springframework.cache

Backend adapters for EhCache, GemFire, Coherence, etc.

Cache namespace

• <cache:annotation-driven />

CacheManager SPI

• EhCacheManager

• GemFireCacheManager

Spring 3.1 Cache Abstraction

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Annotation-Based Caching

Cache name

Custom key

Cache condition

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Spring 3.1 M1 Blog Series:----------------------------------

http://blog.springsource.com/2008/03/26/spring-java-configuration-whats-new-in-m3/

https://github.com/cbeams/spring-3.1-profiles-xmlhttps://github.com/cbeams/spring-3.1-profiles-javahttps://github.com/cbeams/spring-3.1-featurespechttps://github.com/rstoyanchev/spring-3.1-mvc-java-config

Review updated Spring Reference Documentation

Provide feedback via JIRA and Forums

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Thank You