Reading a map from yaml in Java getting null

Question

I am getting a problem in reading my yaml through java, using spring. Let me show the code first

@Component
@EnableConfigurationProperties
@ConfigurationProp         


        

Answer 1

I had the same problem with different generic types and I solved it by initializing the map member and remove the setter method, e.g.:

@Component
@EnableConfigurationProperties
@ConfigurationProperties(prefix = "countries")
public class UserLimitReader{
    private Map<String, Integer> orders = new HashMap<>();

    private Map<String, Integer> requests = new HashMap<>();

    public Map<String, Integer> getOrders() {
        return orders;
    }
    ...
}

Please note I used java 7 diamond operator and change the member type to Map instead of HashMap.

IMPORTANT: In my code, I use Spring's configuration class instead of XML and moved the EnableConfigurationProperties to the configuration class. In your case it should be something like:

@Configuration
@EnableConfigurationProperties(value = {UserLimitReader.class})
public class SpringConfiguration {
    ...
}

@ConfigurationProperties(prefix = "countries", locations: "classpath:config/application.yaml")
public class UserLimitReader {
    ...
}

Don't know how you configure it using XML, however as I wrote in my comments I still think you should make sure Spring's finds your class using component scan or something alike.

@Value work as Spring loads the YAML file without any problem using your context file, however it does not mean UserLimitReader file is loaded and configured by Spring.