SpringBoot map yaml to map of map

Question

Is it possible to inject below yaml file to Spring Boot application as Map<String, Map<String, String> where tradeType will be the key of outer map and P and B will be the key value for inner map for.

tradeType:
    P: B
    S: S
securityCode: 
    ICI: ICICI Bank
    BOB: Bank of Baroda
    BOA: Bank of America
    BOS: Bank of Singapore 

As suggested this is how my class look.

@Configuration
@PropertySource("file:data/referenceDataMapping.yaml")
@ConfigurationProperties(prefix = "map")
public class ReferenceDataMapping {

    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    private Map<String, Map<String, String>> entries;

    @Override
    public String toString() {
        if (entries != null) {
            logger.info(entries.toString());
            return entries.toString();
        } else {
            return null;
        }
    }

    public Map<String, Map<String, String>> getEntries() {
        return entries;
    }

    public void setEntries(Map<String, Map<String, String>> entries) {
        this.entries = entries;
    }

}

from build.gradle

dependencies {
    compile 'org.springframework.boot:spring-boot-starter-activemq:2.1.2.RELEASE'
    compile 'org.springframework.boot:spring-boot-starter-security:2.1.2.RELEASE'
    compile 'org.springframework.boot:spring-boot-starter-web:2.1.2.RELEASE'
    compile 'org.apache.camel:camel-spring-boot-starter:2.23.1'
    compile 'org.apache.camel:camel-quartz2:2.23.1'
    compile 'org.apache.camel:camel-jms:2.23.1'
    compile 'org.apache.camel:camel-jacksonxml:2.23.1'
    compile 'com.fasterxml.jackson.core:jackson-databind:2.9.8'
    compile 'net.sf.saxon:Saxon-HE:9.9.1-1'
    testCompile 'org.springframework.boot:spring-boot-starter-test:2.1.2.RELEASE'
    testCompile 'org.springframework.security:spring-security-test:5.1.3.RELEASE'
}

referenceDataMapping.yaml

    map: 
   entries:
      tradeType:
          P: B
          S: S
      securityCode: 
          ICI: ICICI Bank
          BOB: Bank of Baroda
          BOA: Bank of America
          BOS: Bank of Singapore

Answer 1

Yes . It is possible.

@Configuration
@ConfigurationProperties(prefix="map")
public class Test {

    private Map<String,Map<String,String>> entires;

    public Map<String, Map<String, String>> getEntires() {
        return entires;
    }

    public void setEntires(Map<String, Map<String, String>> entires) {
        this.entires = entires;
    }

}

application.yml :

map:
  entires:
    tradeType:
      P: B
      S: S
    securityCode: 
      ICI: ICICI Bank
      BOB: Bank of Baroda
      BOA: Bank of America
      BOS: Bank of Singapore 

output:

{tradeType={P=B, S=S}, securityCode={ICI=ICICI Bank, BOB=Bank of Baroda, BOA=Bank of America, BOS=Bank of Singapore}}

Update:

As described in this github-issue . @PropertySource doesnt support yaml files . In that case, kindly follow this guide PropertySource-with-yaml-files

Answer 2

If the YAML is in different file than application.yml,

@Component
public class YourClass {


    private Map<String, String> tradeType;
    private Map<String, String> securityCode;

    public Map<String, String> getTradeType() {
        return tradeType;
    }

    public Map<String, String> getSecurityCode() {
        return securityCode;
    }


    @PostConstruct
    public void yamlFactory() {
        YamlMapFactoryBean factory = new YamlMapFactoryBean();
        factory.setResources(new ClassPathResource("your.yml"));
        tradeType = (Map<String, String>) factory.getObject().get("tradeType");
        securityCode = (Map<String, String>) factory.getObject().get("securityCode");
    }
}