HHH-17106 Fix ClassCastException when using length 1 named enum mapping

Author: beikov

hibernate-core/src/test/java/org/hibernate/orm/test/mapping/basic/EnumSingleCharTest.java

@@ -0,0 +1,95 @@
+/*
+ * 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.orm.test.mapping.basic;
+
+import java.util.List;
+
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.EnumType;
+import jakarta.persistence.Enumerated;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+@SessionFactory
+@DomainModel(annotatedClasses = EnumSingleCharTest.Person.class)
+@JiraKey("HHH-17106")
+public class EnumSingleCharTest {
+	@BeforeAll
+	public void setUp(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			session.persist( new Person( 1L, SinglecharEnum.B ) );
+			session.persist( new Person( 2L, SinglecharEnum.R ) );
+		} );
+	}
+
+	@AfterAll
+	public void tearDown(SessionFactoryScope scope) {
+		scope.inTransaction( session -> session.createMutationQuery( "delete from Person" ).executeUpdate() );
+	}
+
+	@Test
+	public void testRead(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			List<Person> resultList = session.createQuery( "from Person order by id", Person.class ).getResultList();
+			assertEquals( 2, resultList.size() );
+			assertEquals( SinglecharEnum.B, resultList.get( 0 ).getSingleChar() );
+			assertEquals( SinglecharEnum.R, resultList.get( 1 ).getSingleChar() );
+		} );
+	}
+
+	public enum SinglecharEnum {
+		B("first"),
+		R("second"),
+		O("third"),
+		K("fourth"),
+		E("fifth"),
+		N("sixth");
+
+		private final String item;
+
+		SinglecharEnum(String item) {
+			this.item = item;
+		}
+
+		public String getItem() {
+			return item;
+		}
+	}
+
+	@Entity(name = "Person")
+	public static class Person {
+		@Id
+		private Long id;
+
+		@Column(name="SINGLE_CHAR", length = 1)
+		@Enumerated(EnumType.STRING)
+		private SinglecharEnum singleChar;
+
+		public Person() {
+		}
+
+		public Person(Long id, SinglecharEnum singleChar) {
+			this.id = id;
+			this.singleChar = singleChar;
+		}
+
+		public SinglecharEnum getSingleChar() {
+			return singleChar;
+		}
+	}
+}