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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'm seeing something similar in Hibernate 5.1.4.</p> <p style="margin: 10px 0 0">My schema looks like this:</p>
<div class="preformatted 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 style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-all; white-space: pre-wrap">public abstract class Super {
private Thing thing;
// "thing" is optional
@ManyToOne
public Thing getThing() {
return this.thing;
}
public void setThing(Thing x) {
this.thing = x;
}
}
public class SubA extends Super {
// "thing" is optional
}
public class SubB extends Super {
// "thing" is mandatory
@Override
@NotNull
public Thing getThing() {
return super.getThing();
}
}
</pre>
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</div> <p style="margin: 10px 0 0">So the <tt>thing</tt> property is optional for <tt>SubA</tt> and mandatory for <tt>SubB</tt>.</p> <p style="margin: 10px 0 0">Here's the problem. This query always returns <tt>null</tt> even if the object exists:</p>
<div class="preformatted 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">
<div class="preformattedContent panelContent" style="padding: 9px 12px">
<pre style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-all; white-space: pre-wrap">this.entityManager.find(SubA.class, id);
</pre>
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</div> <p style="margin: 10px 0 0">The reason is that Hibernate generates an <tt>INNER JOIN</tt> to the <tt>Thing</tt> table, even though that reference is optional for <tt>SubA</tt> instances.</p> <p style="margin: 10px 0 0">It's as if the <tt>@NotNull</tt> constraint is going "up" the class hierarchy from <tt>SubB</tt>, to <tt>Super</tt>, and back down (?) affecting sibling class <tt>SubA</tt>.</p> <p style="margin: 10px 0 0">It seems like a simple rule has been broken: JSR 303 validation constraints should apply downward in the class hierarchy, but never upward!</p> </td>
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