Add Hibernate 7 batches 2-6, batch 7, and batch 8: mapping styles, JPA annotations, natural IDs, @Immutable, stored procedures, in-memory test databases, JNDI mocking, proxies, associations, temporal mapping, named queries, HQL, Criteria API, EntityManager bootstrapping, Ehcache 3 L2 cache configuration, HikariCP connection pooling, Hibernate Validator CDI integration, aggregate functions, sorting, pagination, interceptors, and Hibernate Search 8 (Hibernate 7.4.5.Final + Spring Boot 4.1.1 + JDK 25)

src/main/java/com/ankurm/hibernatedemo/model/WidgetIdentity.java

@@ -0,0 +1,41 @@
+package com.ankurm.hibernatedemo.model;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+
+/**
+ * Insert-scenario twin of {@link WidgetSequence}, identical except for the id generation
+ * strategy. Docs: docs/03-inserting-objects.md.
+ *
+ * <p>{@code IDENTITY} requires the database to hand back the generated key on every single
+ * insert, which is exactly why it defeats JDBC batching &mdash; see the captured output in
+ * docs/output/insert-identity.txt versus docs/output/insert-sequence.txt for the same
+ * {@code hibernate.jdbc.batch_size} setting producing very different behaviour.
+ */
+@Entity
+public class WidgetIdentity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    private String name;
+
+    protected WidgetIdentity() {
+        // JPA
+    }
+
+    public WidgetIdentity(String name) {
+        this.name = name;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+}