Add Hibernate 7 batches 2-5: mapping styles, JPA annotations, natural IDs, @Immutable, stored procedures, in-memory test databases, JNDI mocking, proxies, associations, temporal mapping and named queries (Hibernate 7.4.5.Final + Spring Boot 4.1.1 + JDK 25)

src/main/java/com/ankurm/hibernatedemo/association/MiUser.java

@@ -0,0 +1,35 @@
+package com.ankurm.hibernatedemo.association;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+
+/**
+ * The @MapsId fix: this entity carries NO inverse {@code @OneToOne} field at all. A profile is
+ * looked up on demand with {@code session.find(MiProfile.class, userId)} because it shares the
+ * same primary key value as the user (see {@link MiProfile}), so there is nothing to proxy and
+ * nothing forces an eager join when loading a user.
+ */
+@Entity
+@Table(name = "mi_user")
+public class MiUser {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    private String username;
+
+    protected MiUser() {
+    }
+
+    public MiUser(String username) {
+        this.username = username;
+    }
+
+    public Long getId() {
+        return id;
+    }
+}