HHH-10166 - Sequence generator creates duplicate keys

(cherry picked from commit 3b2157be45)

hibernate-core/src/test/java/org/hibernate/test/id/sequence/OptimizerTest.java

@@ -0,0 +1,71 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
+ * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ */
+package org.hibernate.test.id.sequence;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.SequenceGenerator;
+import javax.persistence.Table;
+
+import org.hibernate.Session;
+
+import org.hibernate.testing.TestForIssue;
+import org.hibernate.testing.junit4.BaseNonConfigCoreFunctionalTestCase;
+import org.junit.Test;
+
+import static org.hamcrest.CoreMatchers.notNullValue;
+import static org.junit.Assert.assertThat;
+
+/**
+ * @author Steve Ebersole
+ */
+public class OptimizerTest extends BaseNonConfigCoreFunctionalTestCase {
+	@Test
+	@TestForIssue( jiraKey = "HHH-10166" )
+	public void testGenerationPastBound() {
+		Session session = openSession();
+		session.getTransaction().begin();
+		for (int i = 0; i < 100; i++) {
+			TheEntity entity = new TheEntity( Integer.toString( i ) );
+			session.save( entity );
+		}
+		session.getTransaction().commit();
+		session.close();
+
+		session = openSession();
+		session.getTransaction().begin();
+		TheEntity number100 = session.get( TheEntity.class, 100 );
+		assertThat( number100, notNullValue() );
+		session.createQuery( "delete TheEntity" ).executeUpdate();
+		session.getTransaction().commit();
+		session.close();
+	}
+
+	@Override
+	protected Class[] getAnnotatedClasses() {
+		return new Class[] { TheEntity.class };
+	}
+
+	@Entity( name = "TheEntity" )
+	@Table( name = "TheEntity" )
+	public static class TheEntity {
+		@Id
+		@GeneratedValue( strategy = GenerationType.SEQUENCE, generator = "seq1" )
+		@SequenceGenerator( name = "seq1", sequenceName = "the_sequence" )
+		public Integer id;
+		public String someString;
+
+		public TheEntity() {
+		}
+
+		public TheEntity(String someString) {
+			this.someString = someString;
+		}
+	}
+}