HHH-18936 javadoc for cascade REMOVE with @onDelete(CASCADE)

Author: gavinking

hibernate-core/src/main/java/org/hibernate/annotations/OnDelete.java

@@ -17,10 +17,33 @@
 /**
  * Specifies an {@code on delete} action for a foreign key constraint.
  * The most common usage is {@code @OnDelete(action = CASCADE)}.
+ * <pre>
+ * &#064;ManyToOne
+ * &#064;OnDelete(action = CASCADE)
+ * Parent parent;
+ * </pre>
  * Note that this results in an {@code on delete cascade} clause in
  * the DDL definition of the foreign key. It's completely different
  * to {@link jakarta.persistence.CascadeType#REMOVE}.
  * <p>
+ * In fact, {@code @OnDelete} may be combined with {@code cascade=REMOVE}.
+ * <pre>
+ * &#064;ManyToOne(cascade = REMOVE)
+ * &#064;OnDelete(action = CASCADE)
+ * Parent parent;
+ * </pre>
+ * <ul>
+ * <li>If {@code @OnDelete(action = CASCADE)} is used in conjunction
+ *     with {@code cascade=REMOVE}, then associated entities are fetched
+ *     from the database, marked deleted in the persistence context,
+ *     and evicted from the second-level cache.
+ * <li>If {@code @OnDelete(action = CASCADE)} is used on its own,
+ *     <em>without</em> {@code cascade=REMOVE}, then associated
+ *     entities are not fetched from the database, are not marked
+ *     deleted in the persistence context, and are not automatically
+ *     evicted from the second-level cache.
+ * </ul>
+ * <p>
  * Like database triggers, {@code on delete} actions can cause state
  * held in memory to lose synchronization with the database.
  *