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POJPA/Hibernate inheritance while loading: IllegalArgumentException, try to set wrong subclass
 

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    <p>I'm using JBoss 6.1, I have the a JPA entagled situation, as a result I got the following error message:</p> <p>IllegalArgumentException: Can not set EquipmentB field EquipmentCycleB.equipment to EquipmentA</p> <p>suppose that each entity has an @Id annotated field:</p> <p>A first hierarchy </p> <pre><code>@Entity @Inheritance(strategy = InheritanceType.SINGLE_TABLE) @DiscriminatorColumn(name = "DIS", discriminatorType = DiscriminatorType.STRING, length = 1) public abstract class Equipment { ... } @Entity @DiscriminatorValue("A") public class EquipmentA extends Equipment { ... } @Entity @DiscriminatorValue("B") public class EquipmentB extends Equipment { ... } </code></pre> <p>A second hierarchy</p> <pre><code>@Entity @Inheritance(strategy = InheritanceType.SINGLE_TABLE) @DiscriminatorColumn(name = "DIS", discriminatorType = DiscriminatorType.STRING, length = 10) public abstract class EquipmentCycle { ... } @Entity @DiscriminatorValue("A") public class EquipmentCycleA extends EquipmentCycle { @JoinColumn(name = "EQUIPMENT_ID", referencedColumnName = "ID") @ManyToOne private EquipmentA equipment; ... } @Entity @DiscriminatorValue("B") public class EquipmentCycleB extends EquipmentCycle { @JoinColumn(name = "EQUIPMENT_ID", referencedColumnName = "ID") @ManyToOne private EquipmentB equipment; ... } </code></pre> <p>So far nothing strange, go on, the class say Status</p> <pre><code>@Entity public class State { @JoinColumn(name = "ENTITY_ID", referencedColumnName = "ID", nullable = false) @ManyToOne private EnityWithState enityWithState; @JoinColumn(name = "EQUIPMENT_ID", referencedColumnName = "ID") @ManyToOne private Equipment equipment; @JoinColumn(name = "EQUIPMENT_CYCLE_ID", referencedColumnName = "ID") @ManyToOne private EquipmentCycle equipmentCycle; ... } </code></pre> <p>and the class which the state belong to</p> <pre><code>public class EnityWithState { ... @OneToMany(mappedBy = "enityWithState", fetch = FetchType.LAZY, cascade = CascadeType.ALL, orphanRemoval = true) private List&lt;State&gt; stateHistory; ... } </code></pre> <p>Don't ask me why, I have just found it. After some time the DB store the following data</p> <pre><code>Table Equipment ID DIS -------------------------------- 1 A ... 2 B ... Table EquipmentCycle ID DIS EQUIPMENT_ID -------------------------------- 1 A 1 2 B 2 Table State ID ENTITY_ID EQUIPMENT_ID EQUIPMENT_CYCLE_ID --------------------------------------------- 1 1 1 1 2 1 2 2 </code></pre> <p>And finally, when I try lo load the EnityWithState with id 1, I got the following error:</p> <p>IllegalArgumentException: Can not set EquipmentB field EquipmentCycleB.equipment to EquipmentA</p> <p>Does anyone have any idea? I googled but I found nothing. Could it be an Hibernate/JPA bug?</p> <p>Thanks in advance for the help</p>
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