Spring - Load custom property file based on value from application.properties

Question

I have application.properties file:

value=a

Then I would like to load a property file based on that value - a.properties and read/use properties from that file.

I was thinking about something like this:

@Configuration
public class PropertiesConfiguration {

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

@Bean
public PropertySourcesPlaceholderConfigurer placeHolderConfigurer() {
    PropertySourcesPlaceholderConfigurer configurer = new PropertySourcesPlaceholderConfigurer();
    configurer.setLocation(new ClassPathResource(value + ".properties"));
    return configurer;
} }

but the value is always null for some reason. When I try to get that value eg in service/component then it works fine. I would like to avoid using spring profiles. Any ideas how to achieve that with latest Spring?

Answer 1

In the line configurer.setLocation(new ClassPathResource(value + ".properties")); it should be "application.properties" since your file name is application.properties

Also in the properties file define it as value = a with spaces

Answer 2

One of the solutions I have come across and works fine is use of Component and PropertySource annotations.

@Component
@PropertySource(value = "classpath:${value}.properties")
public class CountryService implements ICountryService {

@Value("${<whatever in a.properties file>}")
private String currency;

@Override
public String getCurrency() {
    return currency;
}
}

where ${value} is taken from application.properties. Then Autowire that bean whenever needed.