Spring Boot reading yml null - spring

Question

I was trying to get the value from yml file
here is my application.yml-
inbox:
inboxlist:
-INBOX
-TEST
and here's where the data store in- InboxConfig.java
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import lombok.Data;
#Data
#Component
#ConfigurationProperties(prefix = "inbox")
public class InboxConfig {
private static final Logger logger = LoggerFactory.getLogger(InboxConfig.class);
private List<String> inboxlist;
(note I use lombok so there's no getter)
And here's where I called it
#EnableConfigurationProperties
public class SFEmailServiceHandler {
private static final Logger logger = LoggerFactory.getLogger(SFEmailServiceHandler.class);
ArrayList<String> mailTo = new ArrayList<String>();
#Autowired
protected InboxConfig inboxConfig;
List<String> Inboxlist = inboxConfig.getInboxlist();
but I get Cannot invoke "*myorg*.InboxConfig.getInboxlist()" because "this.inboxConfig" is null
Did I miss something? I'm new to Spring boot, and I can't really figure out how the Autowired work.

Answer 1

Use #PostConstruct
This method will be invoked after autowiring(injection).
#EnableConfigurationProperties
public class SFEmailServiceHandler {
private static final Logger logger = LoggerFactory.getLogger(SFEmailServiceHandler.class);
ArrayList<String> mailTo;
#Autowired
protected InboxConfig inboxConfig;
List<String> Inboxlist;
#PostConstruct
private void postConstruct() {
mailTo = new ArrayList<String>();
Inboxlist = inboxConfig.getInboxlist();
}
}

Answer 2

You must also register the class as "springbean" before you can obtain the list values.
example)
inbox:
inboxlist:
- INBOX # Add space...
- TEST
#Slf4j
#Component
#EnableConfigurationProperties(InboxConfig.class)
public class SFEmailServiceHandler {
#Autowired
protected InboxConfig inboxConfig;
List<String> inboxlist;
#PostConstruct
private void init() {
this.inboxlist = inboxConfig.getInboxlist();
log.info("inboxlist : {} ", inboxlist);
}
}