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https://issues.apache.org/jira/browse/OLINGO-824?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Bolz closed OLINGO-824.
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> Incorrect Facets Of JoinColumns
> -------------------------------
>
> Key: OLINGO-824
> URL: https://issues.apache.org/jira/browse/OLINGO-824
> Project: Olingo
> Issue Type: Bug
> Components: odata2-jpa
> Affects Versions: V2 2.0.5
> Reporter: Johannes Hoenger
> Assignee: Michael Bolz
> Fix For: V2 2.0.6
>
> Attachments: Stracktrace.JPG
>
>
> I recognised a potential bug in the JPA processor. I have an entity with the
> following structure:
> {code:title=A.java}
> public class A {
> @Id
> @Column(name = "ID", nullable = false)
> private String id;
> @ManyToOne(optional = true)
> @JoinColumn(name = "PARENT_ID", referencedColumnName = "ID" , nullable
> = true)
> private A parent;
> }
> {code}
> Notice the self reference from "parent" to "id". While the *"id" field can
> not be set null* the field *"parent" is nullable*. In the JPA context, this
> definition can be interpreted.
> Lets have a look at the following entity instances:
> ||ID||PARENT||
> |1|null|
> |2|1|
> While the serialization of Olingo works perfectly fine for the instance with
> id 2, it fails for the instance with id 1. An EdmSimpleTypeException is
> thrown and the following error is returned:
> {code:javascript}
> {
> "error": {
> "code": null,
> "message": {
> "lang": "en",
> "value": "An exception of type 'EdmSimpleTypeException' occurred."
> }
> }
> }
> {code}
> A closer look into the sources (see attached screenshot) seems to indicate
> that the "nullable" attribute for the field "parent" is retrieved from the
> referenced field "id" instead of "parent" itself.
> I also noticed that this issue does not arise, if nullable attribute of the
> "id" field is set to true.
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