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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin: 10px 0 0; margin-top: 0">I think it was a false alarm – I had annotated the fields incorrectly. Changing the annotation as follows will make it work as expected:</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal"><span class="code-keyword" style="color: #000091">package</span> org.hibernate.bugreport.jointable.constraintviolation.entity;
<span class="code-keyword" style="color: #000091">import</span> org.hibernate.annotations.GenericGenerator;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.*;
<span class="code-keyword" style="color: #000091">import</span> java.util.Objects;
@Entity
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>Component {
@Id
@GeneratedValue(generator = <span class="code-quote" style="color: #009100">"UUID"</span>)
@GenericGenerator(
name = <span class="code-quote" style="color: #009100">"UUID"</span>,
strategy = <span class="code-quote" style="color: #009100">"org.hibernate.id.UUIDGenerator"</span>
)
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> id;
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> name;
@ManyToOne(cascade = CascadeType.ALL)
@JoinTable(
name = <span class="code-quote" style="color: #009100">"laptop_components"</span>,
joinColumns = @JoinColumn(
name = <span class="code-quote" style="color: #009100">"component_id"</span>,
referencedColumnName = <span class="code-quote" style="color: #009100">"id"</span>
),
inverseJoinColumns = @JoinColumn(
name = <span class="code-quote" style="color: #009100">"laptop_id"</span>,
referencedColumnName = <span class="code-quote" style="color: #009100">"id"</span>
)
)
<span class="code-keyword" style="color: #000091">private</span> Laptop laptop;
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> getId() {
<span class="code-keyword" style="color: #000091">return</span> id;
}
<span class="code-keyword" style="color: #000091">public</span> void setId(<span class="code-object" style="color: #910091">String</span> id) {
<span class="code-keyword" style="color: #000091">this</span>.id = id;
}
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> getName() {
<span class="code-keyword" style="color: #000091">return</span> name;
}
<span class="code-keyword" style="color: #000091">public</span> void setName(<span class="code-object" style="color: #910091">String</span> name) {
<span class="code-keyword" style="color: #000091">this</span>.name = name;
}
<span class="code-keyword" style="color: #000091">public</span> Laptop getLaptop() {
<span class="code-keyword" style="color: #000091">return</span> laptop;
}
<span class="code-keyword" style="color: #000091">public</span> void setLaptop(Laptop laptop) {
<span class="code-keyword" style="color: #000091">this</span>.laptop = laptop;
}
@Override
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">boolean</span> equals(<span class="code-object" style="color: #910091">Object</span> o) {
<span class="code-keyword" style="color: #000091">if</span> (<span class="code-keyword" style="color: #000091">this</span> == o) <span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">true</span>;
<span class="code-keyword" style="color: #000091">if</span> (o == <span class="code-keyword" style="color: #000091">null</span> || getClass() != o.getClass()) <span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">false</span>;
Component component = (Component) o;
<span class="code-keyword" style="color: #000091">return</span> Objects.equals(id, component.id);
}
@Override
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">int</span> hashCode() {
<span class="code-keyword" style="color: #000091">return</span> Objects.hash(id);
}
}
<span class="code-keyword" style="color: #000091">package</span> org.hibernate.bugreport.jointable.constraintviolation.entity;
<span class="code-keyword" style="color: #000091">import</span> org.hibernate.annotations.GenericGenerator;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.*;
<span class="code-keyword" style="color: #000091">import</span> java.util.HashSet;
<span class="code-keyword" style="color: #000091">import</span> java.util.Objects;
<span class="code-keyword" style="color: #000091">import</span> java.util.Set;
@Entity
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>Laptop {
@Id
@GeneratedValue(generator = <span class="code-quote" style="color: #009100">"UUID"</span>)
@GenericGenerator(
name = <span class="code-quote" style="color: #009100">"UUID"</span>,
strategy = <span class="code-quote" style="color: #009100">"org.hibernate.id.UUIDGenerator"</span>
)
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> id;
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> brand;
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> series;
@OneToMany(cascade = CascadeType.ALL, mappedBy = <span class="code-quote" style="color: #009100">"laptop"</span>)
<span class="code-keyword" style="color: #000091">private</span> Set<Component> components = <span class="code-keyword" style="color: #000091">new</span> HashSet<>();
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> getId() {
<span class="code-keyword" style="color: #000091">return</span> id;
}
<span class="code-keyword" style="color: #000091">public</span> void setId(<span class="code-object" style="color: #910091">String</span> id) {
<span class="code-keyword" style="color: #000091">this</span>.id = id;
}
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> getBrand() {
<span class="code-keyword" style="color: #000091">return</span> brand;
}
<span class="code-keyword" style="color: #000091">public</span> void setBrand(<span class="code-object" style="color: #910091">String</span> brand) {
<span class="code-keyword" style="color: #000091">this</span>.brand = brand;
}
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> getSeries() {
<span class="code-keyword" style="color: #000091">return</span> series;
}
<span class="code-keyword" style="color: #000091">public</span> void setSeries(<span class="code-object" style="color: #910091">String</span> series) {
<span class="code-keyword" style="color: #000091">this</span>.series = series;
}
<span class="code-keyword" style="color: #000091">public</span> Set<Component> getComponents() {
<span class="code-keyword" style="color: #000091">return</span> components;
}
<span class="code-keyword" style="color: #000091">public</span> void setComponents(Set<Component> components) {
<span class="code-keyword" style="color: #000091">this</span>.components = components;
}
<span class="code-keyword" style="color: #000091">public</span> void addComponent(Component component) {
getComponents().add(component);
component.setLaptop(<span class="code-keyword" style="color: #000091">this</span>);
}
@Override
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">boolean</span> equals(<span class="code-object" style="color: #910091">Object</span> o) {
<span class="code-keyword" style="color: #000091">if</span> (<span class="code-keyword" style="color: #000091">this</span> == o) <span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">true</span>;
<span class="code-keyword" style="color: #000091">if</span> (o == <span class="code-keyword" style="color: #000091">null</span> || getClass() != o.getClass()) <span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">false</span>;
Laptop laptop = (Laptop) o;
<span class="code-keyword" style="color: #000091">return</span> Objects.equals(id, laptop.id);
}
@Override
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">int</span> hashCode() {
<span class="code-keyword" style="color: #000091">return</span> Objects.hash(id);
}
}
</pre>
</div>
</div> <p style="margin: 10px 0 0">However, Hibernate detects some classes of invalid annotations on startup. For example, if I have a field definition like this:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal"> @OneToMany(cascade = CascadeType.ALL, mappedBy = <span class="code-quote" style="color: #009100">"laptop"</span>)
@JoinTable(
name = <span class="code-quote" style="color: #009100">"laptop_components"</span>,
joinColumns = @JoinColumn(
name = <span class="code-quote" style="color: #009100">"laptop_id"</span>,
referencedColumnName = <span class="code-quote" style="color: #009100">"id"</span>
),
inverseJoinColumns = @JoinColumn(
name = <span class="code-quote" style="color: #009100">"component_id"</span>,
referencedColumnName = <span class="code-quote" style="color: #009100">"id"</span>
)
)
<span class="code-keyword" style="color: #000091">private</span> Set<Component> components = <span class="code-keyword" style="color: #000091">new</span> HashSet<>();</pre>
</div>
</div> <p style="margin: 10px 0 0">Hibernate throws an exception on startup letting the user know that there’s something wrong with his entity definitions:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">org.hibernate.AnnotationException: Associations marked as mappedBy must not define database mappings like @JoinTable or @JoinColumn: org.hibernate.bugreport.jointable.constraintviolation.entity.Laptop.components</pre>
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</div> <p style="margin: 10px 0 0">It would be nice if Hibernate could warn users when they accidentally place the JoinTable annotation on fields of the joined classes, instead of behaving unexpectedly at runtime.</p> <p style="margin: 10px 0 0">Maybe we can turn this ticket into a feature request to do just that?</p> </td>
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