Vfrdtyky

I'm having issues getting a neo4j RelationshipEntity persisted with Spring Boot. I'm using spring-boot-starter-data-neo4j (2.1.0.RELEASE), and the neo4j docker image tagged 3.4.9.

I have a simple NodeEntity, which contains a collection for the RelationshipEntity:

@NodeEntity

public class Book {

    @Id

    @GeneratedValue

    private Long id;

    private String name;



    public Book() {}



    public Book(String name) {

        this.name = name;

    }



    @Relationship(type = "PURCHASED_WITH", direction = "OUTGOING")

    private Set<BookPurchase> purchases = new HashSet<>();



    // getters and setters follow

}

I have another NodeEntity, which also contains a collection for the relationship entity:

@NodeEntity

public class CreditCard {



    @Id

    @GeneratedValue

    private Long id;

    private String number;



    @DateString(value = "yyyy-MM-dd")

    private Date expiryDate;



    public CreditCard() {}



    public CreditCard(String number, Date expiryDate) {

        this.number = number;

        this.expiryDate = expiryDate;

    }



    @Relationship(type = "PURCHASED_WITH", direction = "INCOMING")

    private Set<BookPurchase> purchases = new HashSet<BookPurchase>(); 



    // getters and setters follow

}

I have the RelationshipEntity, which adds references to both NodeEntity classes in the constructor:

@RelationshipEntity(type = "PURCHASED_WITH")

public class BookPurchase {

    @Id

    @GeneratedValue

    private long id;



    @DateString("yyyy-MM-dd")

    Date purchaseDate;



    @StartNode

    private Book book;



    @EndNode

    private CreditCard card;



    public BookPurchase(){}



    public BookPurchase(CreditCard card, Book book, Date purchaseDate) {

        this.card = card;

        this.book = book;

        this.purchaseDate = purchaseDate;



        this.card.getPurchases().add(this);

        this.book.getPurchases().add(this);

    }

    // getters and setters follow

}

And finally I have the Spring controller tying everything together:

@RestController

public class ExamplesController {



    @Autowired

    CreditCardRepository creditCardRepository;



    @PostMapping(value="/purchases")

    public String createPurchases() {

        CreditCard card = new CreditCard("11111", new GregorianCalendar(2018, Calendar.FEBRUARY, 12).getTime());



        Book book1 = new Book("of mice and men");

        BookPurchase purchase1 = new BookPurchase(card,book1,new GregorianCalendar(2018, Calendar.MARCH, 15).getTime());



        creditCardRepository.save(card);

        return "Successfully created entities";

    }

}

Whenever I try to curl -X POST http://localhost:8080/purchases, I just see the following in the neo4j browser - the RelationshipEntity is not persisted, only the nodes.

Can anyone assist?

Thanks to Gerrit Meier for answering this one. My RelationshipEntity was using the primitive long instead of the object/wrapper Long. Complete details here: https://community.neo4j.com/t/neo4j-relationshipentity-not-persisted/3039