missing many-to-one associations in OData Feed (olingo)

Question

I built a OData Producer based on apache olingo, JPA and mySQL following this tutorial While many-to-many associations are displayed within the OData Feed, many-to-one associations are not displayed at all (neither are their JOIN-columns visible)

Does anyone have an idea, how to get olingo to display those Associations?

Answer 1

With 2.0.0 [http://olingo.apache.org/download.html] release of Olingo V2 lib, it is not mandatory to annotate the relationship property with both name and referencedColumnName.

Refer to the JIRA issue - https://issues.apache.org/jira/browse/OLINGO-127 for more details.

Regards Chandan

Answer 2

We had the same problem. Turns out olingo wasn't getting the default referencedColumnName correctly, so we had to set it manually on all our associations.

e.g.

@ManyToOne(fetch=FetchType.LAZY)    
@JoinColumn(name="AccountId")
public Account account;

Becomes

@ManyToOne(fetch=FetchType.LAZY)    
@JoinColumn(name="AccountId", referencedColumnName = "Id")
public Account account;