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POBidirectional relationship with superclass entity property in JPA
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  1. POBidirectional relationship with superclass entity property in JPA
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    copied!<p>I'm tying to implement some tree-like structure with JPA. I have a "folder" entity and a "test" entity. Folder can contain both folders and tests. Test doesnt contains anything.</p> <p>Both test and folder have a Node superclass, looks like this:</p> <pre><code>@Entity @Inheritance(strategy = InheritanceType.JOINED) public class Node implements TreeNode, Serializable{ private Long id; String description; String name; @ManyToOne Node parent; ...getters, setters and other stuff that doesnt matter... } </code></pre> <p>And here is the Folder class:</p> <pre><code>@Entity public class Folder extends Node{ @LazyCollection(LazyCollectionOption.FALSE) @OneToMany(cascade=CascadeType.ALL, **mappedBy="parent"**) List&lt;Folder&gt; folders; @LazyCollection(LazyCollectionOption.FALSE) @OneToMany(cascade=CascadeType.ALL, **mappedBy="parent"**) List&lt;Test&gt; tests; ... } </code></pre> <p>So the main problem is the mappedBy property, which relates to superclass property not overriden in ancestor, cause I got such exception:</p> <pre><code>Exception while preparing the app : mappedBy reference an unknown target entity property: my.test.model.Folder.parent in my.test.model.Folder.folders </code></pre> <p>There is might be some tricky mapping over "folders" and "test" properties of Folder class, and I need a little help with that. </p> <p>EDIT: I specified both folders and tests properties of Folder class with targetEntity=Node.class:</p> <pre><code> @LazyCollection(LazyCollectionOption.FALSE) @OneToMany(cascade=CascadeType.ALL, mappedBy="parent",targetEntity=Node.class) List&lt;Folder&gt; folders; @LazyCollection(LazyCollectionOption.FALSE) @OneToMany(cascade=CascadeType.ALL, mappedBy="parent",targetEntity=Node.class) List&lt;Test&gt; tests; </code></pre> <p>And its gets work. But works not fine. Now both tests and folders mapped to <strong>both</strong> properties (I dont know why I'm not geting exceptions), when I need to get them separately. </p> <p>So I'm still looking for a suitable mappings to achieve that. I would appriciate any help.</p>
 

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