Hi there,
I have a big project coming up and i consider Neo4j as my primary database.
My problem is, that i hit a wall right at the start of my evaluation ..
Technology:
Java
Neo4j Community Server 2.3.2
neo4j-ogm 1.1.4 library to access the database
javaee-api 7.0
payara 4.1.1 server (basically glassfish)
it's a minimal POC project with just 1 entity class.
-----
@NodeEntity(label = "Account")
public class Account {
@GraphId
public Long id;
@Property(name = "first_name")
public String firstname;
@Property(name = "last_name")
public String lastname;
// getters and setters
}
and a sessionFactory, mostly 1:1 as on all the neo4j tutorials:
public class Database{
String username = "neo4j";
String password = "neo4jj";
private static Database factory = new Database();
private final static SessionFactory sessionFactory = new
SessionFactory("foobar.domain");
public static Database getInstance() {
return factory;
}
private Database() {
}
public Session getNeo4jSession() {
return sessionFactory.openSession("http://localhost:7474";,
username, password);
}
}
and a store/service class for that entity
@Named
@Stateless
public class AccountStore{
private static final int DEPTH_LIST = 0;
private static final int DEPTH_ENTITY = 1;
private Session session = Database.getInstance().getNeo4jSession();
public Iterable<Account> findAll() {
return session.loadAll(Account.class, DEPTH_LIST);
}
public Account find(Long id) {
return session.load(Account.class, id, DEPTH_ENTITY);
}
public void delete(Long id) {
session.delete(session.load(Account.class, id));
}
public Account createOrUpdate(Account entity) {
session.save(entity, DEPTH_ENTITY);
return find(((Account) entity).getId());
}
}
and a small bean that triggers all of that :
@Named(value = "mockBean")
@SessionScoped
public class MockBean {
@Inject
AccountStore accStore;
public void startMock(){
Account acc = new Account();
acc.setFirstname("Foo " + System.currentTimeMillis());
acc.setLastname("Bar " + System.currentTimeMillis());
Account storedAcc = accStore.createOrUpdate(acc);
System.out.println("Account created with id: " + storedAcc.getId());
}
}
and i always get this error:
Caused by: org.neo4j.ogm.session.result.ResultProcessingException:
"errors":[{"code":"Neo.ClientError.Statement.InvalidType","message":"Expected
a numeric value for empty iterator, but got null"}]}
at
org.neo4j.ogm.session.response.JsonResponse.parseErrors(JsonResponse.java:165)
at
org.neo4j.ogm.session.response.JsonResponse.parseColumns(JsonResponse.java:139)
at
org.neo4j.ogm.session.response.JsonResponse.initialiseScan(JsonResponse.java:75)
at
org.neo4j.ogm.session.response.GraphModelResponse.initialiseScan(GraphModelResponse.java:69)
at
org.neo4j.ogm.session.response.GraphModelResponse.<init>(GraphModelResponse.java:39)
... 99 more
what can i do ? with this error message, there is just 1 stackoverflow
result in google (3 google results overall !!)
and this stackoverflow error is related to Relationships .. so this does
not apply here.
What am i doing wrong ?
Best regards
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