Spring @Value is not resolving to value from prope

问题:

I've had this working in some other project before, I am just re-doing the same thing but for some reason it's not working. The Spring @Value is not reading from property file, but instead it's taking the value literally

AppConfig.java

@Component
public class AppConfig
{
    @Value("${key.value1}")
    private String value;

    public String getValue()
    {
        return value;
    }
}

applicationContext.xml:

<context:component-scan
    base-package="com.test.config" />
<context:annotation-config />

<bean id="appConfigProperties"
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="location" value="classpath:appconfig.properties" />
</bean>

appconfig.properties

key.value1=test value 1

In my controller, where I have:

@Autowired
private AppConfig appConfig;

The application starts just fine, but when I do

appConfig.getValue()

it returns

${key.value1}

It doesn't resolve to the value inside the properties file.

Thoughts?

回答1:

I also found the reason @value was not working is, @value requires PropertySourcesPlaceholderConfigurer instead of a PropertyPlaceholderConfigurer. i did the same changes and it worked for me, i am using spring 4.0.3 release. I configured this using below code in my configuration file -

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

回答2:

Problem is due to problem in my applicationContext.xml vs spring-servlet.xml - it was scoping issue between the beans.

pedjaradenkovic kindly pointed me to an existing resource: Spring @Value annotation in @Controller class not evaluating to value inside properties file and Spring 3.0.5 doesn't evaluate @Value annotation from properties

回答3:

In my case, static fields will not be injected.

回答4:

I was using spring boot, and for me upgrading the version from 1.4.0.RELEASE to 1.5.6.RELEASE solved this issue.

回答5:

Have a read of pedjaradenkovic's comment.

Further to the link he provides, the reason this isn't working is that @Value processing requires a PropertySourcesPlaceholderConfigurer instead of a PropertyPlaceholderConfigurer.

回答6:

In my case I was missing the curly braces. I had @Value("foo.bar") String value instead of the correct form @Value("${foo.bar}") String value

回答7:

for Sprig-boot User both PropertyPlaceholderConfigurer and the new PropertySourcesPlaceholderConfigurer added in Spring 3.1. so it's straightforward to access properties file. just inject

Note: Make sure your property is not Static

@Value("${key.value1}")
private String value;