Yaml file value is not loading using jackson in java

Question

I want to load a yaml file & store it in Config.java.

Here is my yaml file: (Its much bigger. I am giving a simplified version)

---
application:
  admin:
    jobInterValTime: 1440
    customer: lc
system:
  mongo:
    host: localhost
    port: 27017
    dbName: LC_Test
    collections:
      groupsCollection: groups
      membershipCollection: memberships
      personsCollection: persons

Here is Config.java:

public class Config {
  private Application application;
  private System system;
  //Getter setter
}

Application.java

public class Application {
    private Admin admin;    
    //Getter Setter
}

Admin.java

public class Admin {
    private String jobInterValTime;
    private String customer;
    //Getter Setter
}

System.java

public class System {

    private Mongo mongo;       
    //Getter Setter
}

Mongo.java

public class Mongo {
    private String host;
    private String port;
    private String dbName;
    private Map<String, String> collections;
    //Getter Setter
}

But the application & system object inside Config.java is coming null.No exception is happening. Can anybody help?

Here is what I have written.

Config config = null;
ObjectMapper objectMapper = new ObjectMapper(new YAMLFactory());
try{
    config = objectMapper.readValue(new File("src/test/java/resources/test1.yaml"), Config.class);
    //System.out.println(application.getAdmin().getCustomer());
    // System.out.println(unidataConfig.getApplication().getAdmin().getCustomer());

} catch(Exception e) {
    e.printStackTrace();
}

Answer 1

I don't know the root cause here, code looks good. But one thing you could try is to read contents as Map or JsonNode first, and see how structure looks like. There may well be a mismatch.

Answer 2

I solved the problem. The mistake was very stupid. In one setter method I have written like this: var1 = var1 instead of this.var1 = var1 .