Best Approach to load application.yml in spring boot application - spring

Question

I am having Spring Boot application and having application.yml with different properties and loading as below.
#Configuration
#ConfigurationProperties(prefix="applicationprops")
public class ApplicationPropHolder {
private Map<String,String> mapProperty;
private List<String> myListProperty;
//Getters & Setters
}
My Service or Controller Class in which I get this properties like below.
#Service
public ApplicationServiceImpl {
#Autowired
private ApplicationPropHolder applicationPropHolder;
public String getExtServiceInfo(){
Map<String,String> mapProperty = applicationPropHolder.getMapProperty();
String userName = mapProperty.get("user.name");
List<String> listProp = applicationPropHolder.getMyListProperty();
}
}
My application.yml
spring:
profile: dev
applicationprops:
mapProperty:
user.name: devUser
myListProperty:
- DevTestData
---
spring:
profile: stagging
applicationprops:
mapProperty:
user.name: stageUser
myListProperty:
- StageTestData
My questions are
In my Service class i am defining a variable and assigning Propertymap for every method invocation.Is it right appoach?
Is there any other better way I can get these maps without assigning local variable.

Answer 1

There are three easy ways you can assign the values to instance variables in your bean class.
Use the #Value annotation as follows
#Value("${applicationprops.mapProperty.user\.name}")
private String userName;
Use the #PostConstruct annotation as follows
#PostConstruct
public void fetchPropertiesAndAssignToInstanceVariables() {
Map<String, String> mapProperties = applicationPropHolder.getMapProperty();
this.userName = mapProperties.get( "user.name" );
}
Use #Autowired on a setter as follows
#Autowired
public void setApplicationPropHolder(ApplicationPropHolder propHolder) {
this.userName = propHolder.getMapProperty().get( "user.name" );
}
There may be others, but I'd say these are the most common ways.

Answer 2

Hope, you are code is fine.
Just use the below
#Configuration
#ConfigurationProperties(prefix="applicationprops")
public class ApplicationPropHolder {
private Map<String,String> mapProperty;
private List<String> myListProperty;
public String getUserName(){
return mapProperty.get("user.name");
}
public String getUserName(final String key){
return mapProperty.get(key);
}
}
#Service
public ApplicationServiceImpl {
#Autowired
private ApplicationPropHolder applicationPropHolder;
public String getExtServiceInfo(){
final String userName = applicationPropHolder.getUserName();
final List<String> listProp = applicationPropHolder.getMyListProperty();
}
}