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POCascadeType problem in One to Many Relation
 

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  1. POCascadeType problem in One to Many Relation
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    <p>I have two classes which have a Unidirectional One to Many relation with each other.</p> <pre><code>public class Offer{ ... @OneToMany(cascade=CascadeType.ALL) @JoinTable(name = "Offer_Fields", joinColumns = @JoinColumn(name = "OFFER_ID"), inverseJoinColumns = @JoinColumn(name = "FIELDMAPPER_ID")) private Set&lt;FieldMapper&gt; fields = new HashSet&lt;FieldMapper&gt;(); } @Entity @Table(name = "FieldMapper") public class FieldMapper implements Serializable { @Id @Column(name = "FIELDMAPPER_ID") @GeneratedValue private int id; @OneToOne(cascade=CascadeType.ALL) @JoinColumn(name = "multilingual_field_fk") private MultiLingual field; @OneToOne(cascade=CascadeType.ALL) @JoinColumn(name = "multilingual_value_fk") private MultiLingual value; } </code></pre> <p>I want to store an Offer with a set of FieldMapper to database. When I Use CascadeType.ALL in my OneToMany, I got this error:</p> <pre><code>org.hibernate.HibernateException: Illegal attempt to associate a collection with two open sessions </code></pre> <p>and when I change CascadeType to something else I got this error:</p> <pre><code>org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.RCSTT.library.FieldMapper </code></pre> <p>and here is where I save Offer :</p> <pre><code>public void insert(Offer offer) throws SQLException { Session session = HibernateUtil.getSession(); Transaction tx = session.beginTransaction(); session.save(offer); tx.commit(); session.close(); } </code></pre> <p>and I don't use session in somewhere else.</p> <p>in <code>tx.commit();</code> line throws explained exceptions.</p> <p>Thanks for your help.</p>
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    1. USMilad.KH
    1. USMilad.KH
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      1. POCascadeType problem in One to Many Relation
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    1. COJust out of curiosity, are the One to Many relationships involving the same set of columns in the tables? I'm just wondering how this mathematically possible.
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      1. USVineet Reynolds
    2. CONo. Each class has its own columns in its own table but In my case a Join table will be created to manage the relation (you can create a One to Many relation without a join table).
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      1. POCascadeType problem in One to Many Relation
      1. USMilad.KH
    3. COWell, it might be useful to post the code of the FieldMapper class then. For some reason, I believe this is a ManyToMany relationship.
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      1. POCascadeType problem in One to Many Relation
      1. USVineet Reynolds
 

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