DZone
Thanks for visiting DZone today,
Edit Profile
  • Manage Email Subscriptions
  • How to Post to DZone
  • Article Submission Guidelines
Sign Out View Profile
  • Post an Article
  • Manage My Drafts
Over 2 million developers have joined DZone.
Log In / Join
Refcards Trend Reports
Events Video Library
Refcards
Trend Reports

Events

View Events Video Library

Zones

Culture and Methodologies Agile Career Development Methodologies Team Management
Data Engineering AI/ML Big Data Data Databases IoT
Software Design and Architecture Cloud Architecture Containers Integration Microservices Performance Security
Coding Frameworks Java JavaScript Languages Tools
Testing, Deployment, and Maintenance Deployment DevOps and CI/CD Maintenance Monitoring and Observability Testing, Tools, and Frameworks
Culture and Methodologies
Agile Career Development Methodologies Team Management
Data Engineering
AI/ML Big Data Data Databases IoT
Software Design and Architecture
Cloud Architecture Containers Integration Microservices Performance Security
Coding
Frameworks Java JavaScript Languages Tools
Testing, Deployment, and Maintenance
Deployment DevOps and CI/CD Maintenance Monitoring and Observability Testing, Tools, and Frameworks

Generative AI has transformed nearly every industry. How can you leverage GenAI to improve your productivity and efficiency?

SBOMs are essential to circumventing software supply chain attacks, and they provide visibility into various software components.

Related

  • How to Marry MDC With Spring Integration
  • How Spring and Hibernate Simplify Web and Database Management
  • Functional Endpoints: Alternative to Controllers in WebFlux
  • Graceful Shutdown: Spring Framework vs Golang Web Services

Trending

  • Continuous Quality Engineering: The Convergence of CI/CD, Chaos Testing, and AI-Powered Test Orchestration
  • Microservice Madness: Debunking Myths and Exposing Pitfalls
  • Microservices for Machine Learning
  • Parallel Data Conflict Resolution in Enterprise Workflows: Pessimistic vs. Optimistic Locking at Scale
  1. DZone
  2. Coding
  3. Frameworks
  4. Spring Expression Language (SpEL) Predefined Variables

Spring Expression Language (SpEL) Predefined Variables

By 
Gordon Dickens user avatar
Gordon Dickens
·
May. 16, 11 · Interview
Likes (0)
Comment
Save
Tweet
Share
23.7K Views

Join the DZone community and get the full member experience.

Join For Free

Spring 3.0 introduced Spring Expression Language (SpEL). There are two variables that you have available “systemProperties” and “systemEnvironment“. SpEL allows us to access information from our beans and system beans information at runtime (late binding).

These can be applied to bean fields as defaults using the JSR-303 @Value annotation on a field or in XML with the <bean ... value="" /> options.

  • systemProperties – a java.util.Properties object retrieving properties from the runtime environment
  • systemEnvironment – a java.util.Properties object retrieving environment specific properties from the runtime environment

We can access specific elements from the Properties object with the syntax:

  • systemProperties['property.name']
  • systemEnvironment['property.name']

public class MyEnvironment {

@Value("#{ systemProperties['user.language'] }")
private String varOne;

@Value("#{ systemProperties }")
private java.util.Properties systemProperties;

@Value("#{ systemEnvironment }")
private java.util.Properties systemEnvironment;

@Override
public String toString() {
return "\n\n********************** MyEnvironment: [\n\tvarOne="
+ varOne + ", \n\tsystemProperties=" + systemProperties
+ ", \n\tsystemEnvironment=" + systemEnvironment + "]";
}
}

Register the “MyEnvironment” bean in your Spring context and create a JUnit test to display the variables.

 

From http://gordondickens.com/wordpress/2011/05/12/spring-expression-language-spel-predefined-variables/

Spring Framework

Opinions expressed by DZone contributors are their own.

Related

  • How to Marry MDC With Spring Integration
  • How Spring and Hibernate Simplify Web and Database Management
  • Functional Endpoints: Alternative to Controllers in WebFlux
  • Graceful Shutdown: Spring Framework vs Golang Web Services

Partner Resources

×

Comments

The likes didn't load as expected. Please refresh the page and try again.

ABOUT US

  • About DZone
  • Support and feedback
  • Community research
  • Sitemap

ADVERTISE

  • Advertise with DZone

CONTRIBUTE ON DZONE

  • Article Submission Guidelines
  • Become a Contributor
  • Core Program
  • Visit the Writers' Zone

LEGAL

  • Terms of Service
  • Privacy Policy

CONTACT US

  • 3343 Perimeter Hill Drive
  • Suite 100
  • Nashville, TN 37211
  • [email protected]

Let's be friends: