Spring Data Neo4j MappingException: Field with primary id is null for entity - spring-boot

Question

I have a node entity class that is extending an abstract class which is in turn extending another abstract class as follows:
public abstract class AbstractModel{
#Id
#GeneratedValue(strategy = UuidStrategy.class)
#Convert(UuidStringConverter.class)
protected UUID uuid;
}
public abstract class AbstractBayModel extends AbstractModel{
.....//more protected fields
}
public class Person extends AbstractBayModel{
private String name;
.//more code
.
.
}
#Service
//Has a reference to a repository
public class PersonService{
public void add(Person person){
repository.insert(person);
}
}
now when I invoke the service class's add() method, I am getting the following error.
org.neo4j.ogm.exception.core.MappingException: Field with primary id is null for entity model.Person#41a45331
I have tried to alter the service method as follows and still get the same error:
public void add(Person person){
person.setUuid(UUID.randomUUID();
repository.insert(person);
}
I am using the following spring dependencies
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-neo4j</artifactId>
</dependency>
Would be mighty obliged if anyone can assist.
regards

Answer 1

I had a similar problem when I wanted to persist an entity with custom-object-properties.
Neo4j-OGM only supports
any primitive, boxed primitive, String or arrays thereof,
essentially anything that naturally fits into a Neo4j node property.
I replaced all properties with the supported analogs leaving id as the only non-naturally fitting field:
#Id #Convert(UuidStringConverter.class)
#GeneratedValue(strategy = UuidStrategy.class)
private UUID uuid;
It worked for me, I hope it helps someone else.