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https://issues.apache.org/jira/browse/OLINGO-706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14614804#comment-14614804
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srikanth raghupatruni commented on OLINGO-706:
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Hi Chandan,
Thanks for your response. Here is the problem in detail. Hope it defines the
problem clearly
I am using the ODataJPAServiceFactory to expose my entity model as oData
service. In my database I have got two tables which are Page and Container.
Below is the db model
Page
Id int
name varchar
Container
Id int
name varchar
title varchar
Page_id int
There is a foreign key relation defined on container.page_id = page.id.
However, page_id is optional in Container table and can be null.
In the JPA class, I have defined a ManyToOne relation in Container class like
below
@ManyToOne(optional = true)
@JoinColumn(name = "page_id",columnDefinition="integer",nullable=true)
private Page parentPage
And exposed both parent and container classes as entities via persistence.xml.
Now If I try to do a post operation on container without providing value for
page_id, I am getting “Metadata cannot be null” error though the record is
getting created in the database.
Hope it is clear now. Please let me know if you have further questions
> Nullable is set to true for all the relations JPA
> -------------------------------------------------
>
> Key: OLINGO-706
> URL: https://issues.apache.org/jira/browse/OLINGO-706
> Project: Olingo
> Issue Type: Bug
> Components: odata2-jpa
> Affects Versions: V2 2.0.3
> Reporter: srikanth raghupatruni
> Priority: Blocker
>
> For all the relations defined as ManyToOne, the field type is getting set as
> not nullable. As per my data model , the foriegnkey field can be null.
> I tried setting the below annotations but the metadata is getting generated
> as nullable = false
> @ManyToOne(optional = true)
> @JoinColumn(name = "page",columnDefinition="integer",nullable=true)
> private Page parentPage
> here page is my database column which can be null and have a relation defined
> with Master table Page on Column Id.
> Because of this I am unable to read, write the data by setting the page field
> value as null
> How can I make the nullable = true
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