Java spring with mongoDB DBref not fetching the populated data - spring

Question

I am trying to fetch a row in mongo db collection which has an array of object id which is the ObjectID of rows of data in other collection. I want to fetch the populated array of rows of data from ther collection for each record of data from the current collection.
My collections are like this
Jobs
- ObjectID
- [ObjectIds(Object Ids of candidates)]
Candidates
-ObjectID
-Name
-Age
I am using
import org.springframework.data.mongodb.core.mapping.DBRef;
in my model class to indicate the reference.
#Document(collection = "jobcreations")
public class Job {
#Id
private String id;
#DBRef
private List<Candidate> _candidates;
private String jobID;
public String getjobID() {
return jobID;
}
public void setjobID(String jobid) {
this.jobID = jobid;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public JobCreation() {
super();
}
public List<Candidate> get_candidates() {
return _candidates;
}
public void set_candidates(List<Candidate> _candidates) {
this._candidates = _candidates;
}
public JobCreation(String jobID) {
super();
this.jobID = jobID;
}
#Override
public String toString() {
return "JobCreation [id=" + id + ", _candidates=" + _candidates + ", jobID=" + jobID + "]";
}
}
My candidate model class is like this
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
#Document(collection = "candidate")
public class Candidate {
#Id
private String _id;
private String name;
private int age;
public String get_id() {
return _id;
}
public void set_id(String _id) {
this._id = _id;
}
/**
* #return the name
*/
public String getName() {
return name;
}
/**
* #param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* #return the age
*/
public String getAge() {
return age;
}
/**
* #param age the age to set
*/
public void setAge(int age) {
this.age = age;
}
public Candidate() {
super();
// TODO Auto-generated constructor stub
}
}
My main method where i call the db is
ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringMongoConfig.class);
MongoOperations mongoOperation = (MongoOperations) ctx.getBean("mongoTemplate");
List<JobCreation> listJobCreation = mongoOperation.findAll(JobCreation.class);
for(JobCreation jc : listJobCreation){
System.out.println(jc.toString());
}
Here i am getting the error
Exception in thread "main" org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type org.bson.types.ObjectId to type com.mkyong.model.CandidateProfile
at org.springframework.core.convert.support.GenericConversionService.handleConverterNotFound(GenericConversionService.java:276)
at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:172)
at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:154)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.getPotentiallyConvertedSimpleRead(MappingMongoConverter.java:673)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readCollectionOrArray(MappingMongoConverter.java:751)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readValue(MappingMongoConverter.java:1006)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.access$100(MappingMongoConverter.java:75)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbPropertyValueProvider.getPropertyValue(MappingMongoConverter.java:957)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.getValueInternal(MappingMongoConverter.java:713)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter$2.doWithAssociation(MappingMongoConverter.java:257)
at org.springframework.data.mapping.model.BasicPersistentEntity.doWithAssociations(BasicPersistentEntity.java:252)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:254)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:212)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:176)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:172)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:75)
at org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doWith(MongoTemplate.java:1840)
at org.springframework.data.mongodb.core.MongoTemplate.executeFindMultiInternal(MongoTemplate.java:1536)
at org.springframework.data.mongodb.core.MongoTemplate.findAll(MongoTemplate.java:1057)
at com.mkyong.core.App.main(App.java:29)
Kindly help me how to solve this error.
Thanks in advance