@Value not resolved when using @PropertySource annotation. How to configure PropertySourcesPlaceholderConfigurer?

Question

I have following configuration class:

@Configuration
@PropertySource(name = \"props\", value = \"classpath:/app-config.properties\")
@ComponentScan(\"service         


        

Answer 1

Don't you need a method on your @Configuration class that returns PropertySourcesPlaceholderConfigurer, annotated @Bean and is static, to register any @PropertySource with Spring?

http://www.baeldung.com/2012/02/06/properties-with-spring/#java

https://jira.springsource.org/browse/SPR-8539

Answer 2

If you use @PropertySource, properties have to be retrieved with:

@Autowired
Environment env;
// ...
String subject = env.getProperty("mail.subject");

If you want to retrieve with @Value("${mail.subject}"), you have to register the prop placeholder by xml.

Reason: https://jira.springsource.org/browse/SPR-8539

Answer 3

I had the very same problem. @PropertySource is not playing well with @Value. A quick workaround is to have an XML configuration which you'll refer to it from your Spring Java Configuration using @ImportResource as usual and that XML configuration file will include a single entry: <context:property-placeholder /> (of course with the needed namespace ceremony). Without any other change @Value will inject properties in your @Configuration pojo.

Answer 4

That looks mighty complicated, can't you just do

 <context:property-placeholder location="classpath:some.properties" ignore-unresolvable="true"/>

then in code reference:

@Value("${myProperty}")
private String myString;

@Value("${myProperty.two}")
private String myStringTwo;

where some.properties looks something like this

myProperty = whatever
myProperty.two = something else\
that consists of multiline string

For java based config you can do this

@Configuration
@PropertySource(value="classpath:some.properties")
public class SomeService {

And then just inject using @value as before

Answer 5

Another thing that may be happening: ensure your @Value annotated values are not static.