Object is not an instance of a persistable class warning with Spring boot and Neo4j - spring-boot

Question

I have a pretty straightforward class called User which is supposed to create user objects containing user information and login details.
package com.example.domain;
import org.neo4j.ogm.annotation.GraphId;
import org.neo4j.ogm.annotation.NodeEntity;
import org.neo4j.ogm.annotation.Relationship;
import java.util.HashSet;
import java.util.Set;
#NodeEntity
public class User {
public User() {}
#GraphId
private Long id;
private String username;
private String password;
private String name;
private String email;
private String Role;
#Relationship(type="BELONGS_TO", direction = Relationship.INCOMING)
Set<Item> items = new HashSet<>();
public User(String name, String username, String password, String email) {
this.name = name;
this.username = username;
this.password = password;
this.email = email;
}
// Getters and setters below for private fields...
}
The controller creating the object looks like this:
#RequestMapping(value = "/register",method = RequestMethod.POST)
public String register(Model model,
#ModelAttribute(value="name") String name,
#ModelAttribute(value="username") String username,
#ModelAttribute(value="email") String email,
#ModelAttribute(value="password") String password,
#ModelAttribute(value="confirmPassword") String confirmPassword) {
if(!password.equals(confirmPassword)) {
model.addAttribute("error", true);
return "register";
}
User userEntity=new User(name,username,password,email);
userManagementService.save(userEntity); //<------The object is created but the error occures during persistance
return "login";
}
and my user management service looks like this:
public interface UserManagementService {
List<User> listAll();
User save(User user);
User findUser(String username);
}
What makes the User class, not an instance of a persistable class. What are the characteristics of a persistable class and how can I make User a persistable class?

Answer 1

Have you configured the OGM somewhere? Either in a Java configuration or in a ogm.properties file? You'll need to specify the driver type and tell the SessionFactory where to look for your domain objects.
OGM config reference: https://neo4j.com/docs/ogm-manual/2.1/reference/#reference:configuration
SessionFactory config reference: https://neo4j.com/docs/ogm-manual/2.1/reference/#reference:connecting:session-factory