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POJpa Objet has null value on the references
 

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  1. POJpa Objet has null value on the references
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    <p>I have an object returned by a Hibernate Query, an object which should have a list of replacements in it. So, I have an "order" Object which should have a "Replacement" Set in it, the problem is that when I lookup that list, this is what i get <code>com.sun.jdi.InvocationException occurred invoking method.</code> and then, when the code keeps running and I try to acces that set, this is what I get <code>failed to lazily initialize a collection of role: uo.ri.model.Order.ReplacementList, no session or session was closed</code></p> <p>I Really have no idea why I'm having this error, I'm going to paste here my <code>Order</code> and my <code>Replacement</code> classes, hope you can solve it</p> <pre><code>@Entity @Table(name = "TOrder") public class Order implements Serializable { @Id @GeneratedValue long id; @Temporal(TemporalType.DATE) private Date creation_date; @Temporal(TemporalType.DATE) private Date reception_date; @Enumerated(EnumType.STRING) private PedidoStatus status; private float price; @OneToMany(mappedBy = "order") private Set&lt;PedidoRepuesto&gt; replacementList= new HashSet&lt;PedidoRepuesto&gt;(); @ManyToOne private Proveedor provider; } @Entity @Table(name = "TReplacement") public class Repuesto implements Serializable { @Id @GeneratedValue long id; private String name; private double price; private int having; private int likeToHave; private int minimumToHave; private int totalHaving; private float totalPrice; @OneToMany(mappedBy = "replacement") private Set&lt;OrderReplacement&gt; orderReplacements= new HashSet&lt;OrderReplacement&gt;(); @OneToMany(mappedBy = "replacement") private Set&lt;Sustitucion&gt; sustituciones = new HashSet&lt;Sustitucion&gt;(); @OneToMany(mappedBy = "replacement") private Set&lt;ProviderReplacement&gt; providerReplacement= new HashSet&lt;ProviderReplacement&gt;(); } </code></pre> <p>Both clases has the getters/setters and constructors.</p> <p>If you need me to paste here more clases or something please just ask. Thank you so much.</p>
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    1. USSantanor
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    1. COdid you try putting your list `fetch=FetchType.Eager`
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      1. USnachokk
    2. CONo, didn't try, but in the database the equivalent of that list isn't null so, why I'm not reciving any data?
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      1. USSantanor
    3. COcause default fetch is lazy , that is it's not query if you don't specify , returns a proxy , and when you really need, there query the db , and may be your session was already close..
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      1. USnachokk
 

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