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POJPA/Hibernate SingleTable Inheritance - Sub class can not persist relations defined in the super class
 

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  1. POJPA/Hibernate SingleTable Inheritance - Sub class can not persist relations defined in the super class
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    <p>I have a single table inheritance hierarchy in jpa as shown below:</p> <pre><code>@Entity @Inheritance(strategy = InheritanceType.SINGLE_TABLE) @Table(catalog = "onedb", name = "content") @DiscriminatorColumn(name = "oid_content_type", discriminatorType = DiscriminatorType.INTEGER) public abstract class Content implements Serializable { ... @OneToMany(cascade = CascadeType.PERSIST) @JoinColumn(name = "oid_content", referencedColumnName = "oid_content") private List&lt;ContentKeyword&gt; keywords; ... @Entity public abstract class RichMedia extends Content { ... @OneToMany(mappedBy="richMedia", cascade =CascadeType.PERSIST) private Set&lt;RichMediaFile&gt; richMediaFiles; ... } @Entity @DiscriminatorValue("1") public class RichMediaImage extends RichMedia {} </code></pre> <p>As can be seen Content is the top most base class, RichMedia is the base class for RichMediaImage and Content has a list of ContentKeyword as defined as below:</p> <pre><code> @Entity @Table(catalog = "onedb", name="content_keyword") public class ContentKeyword implements Serializable { ... @ManyToOne @JoinColumn(name = "oid_content") private Content content; } </code></pre> <p>I construct a RichMediaImage and set the list of ContentKeyword on it and try to persist the whole object. The single table, content is inserted with a new row and a new id is generated but when it comes to insert into the content_keyword table this new id is not provided in the sql jpa generates:</p> <pre><code> insert into onedb.content_keyword (oid_content, keyword) values (NULL, 'test') </code></pre> <p>throwing</p> <pre><code>MySQLIntegrityConstraintViolationException: Column 'oid_content' cannot be null </code></pre> <p>I'd greatly appreciate any pointers.</p>
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