Spring 3.2 @value annotation with pure java configuration does not work, but Environment.getProperty works

Question

I've been breaking my head on this one. Not sure what I am missing. I am unable to get the @Value annotations to work in a pure java configured spring app(non web)

@Configuration
@PropertySource("classpath:app.properties")
public class Config {
    @Value("${my.prop}") 
    String name;

    @Autowired
    Environment env;

    @Bean(name = "myBean", initMethod = "print")
    public MyBean getMyBean(){
         MyBean myBean = new MyBean();
         myBean.setName(name);
         System.out.println(env.getProperty("my.prop"));
         return myBean;
    }
}

The property file just contains my.prop=avalue The bean is as follows:

public class MyBean {
    String name;
    public void print() {
        System.out.println("Name: " + name);
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

The environment variable prints the value properly, the @Value does not.
avalue
Name: ${my.prop}

The main class just initializes the context.

AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(Config.class);

However if I use

@ImportResource("classpath:property-config.xml")

with this snippet

<context:property-placeholder location="app.properties" />

then it works fine. Of course now the enviroment returns null.

dimchez · Accepted Answer · 2013-06-13 22:44:19Z

110

Add the following bean declaration in your Config class

@Bean
public static PropertySourcesPlaceholderConfigurer propertyPlaceholderConfigurer() {
    return new PropertySourcesPlaceholderConfigurer();
}

In order for @Value annotations to work PropertySourcesPlaceholderConfigurer should be registered. It is done automatically when using <context:property-placeholder> in XML, but should be registered as a static @Bean when using @Configuration.

See @PropertySource documentation and this Spring Framework Jira issue.

answered Jun 13, 2013 at 22:44

dimchez

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3 Comments

Abe Over a year ago

This worked great! The spring doc @Configuration misses this out. Leading to all this confusion

Bukes Over a year ago

+1 - Embarrassingly, I always seem to forget this when starting a new project, and I find this answer each time.

Arpit Aggarwal Over a year ago

Registering the bean as "static" is the key to me. Thanks.

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