HHH-15286 Add test for issue

hibernate-core/src/test/java/org/hibernate/orm/test/idclass/IdClassWithOneAttributeTest.java

@@ -0,0 +1,113 @@
+package org.hibernate.orm.test.idclass;
+
+import java.io.Serializable;
+
+import org.hibernate.testing.TestForIssue;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.IdClass;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+@DomainModel(
+		annotatedClasses = IdClassWithOneAttributeTest.SystemUser.class
+)
+@SessionFactory
+@TestForIssue(jiraKey = "HHH-15286")
+public class IdClassWithOneAttributeTest {
+
+	@BeforeEach
+	public void setUp(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session -> {
+					PK pk = new PK( "Linux" );
+					SystemUser systemUser = new SystemUser();
+					systemUser.setId( pk );
+					systemUser.setName( "Andrea" );
+					session.save( systemUser );
+				}
+		);
+	}
+
+	@AfterEach
+	public void tearDown(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session ->
+						session.createQuery( "delete from SystemUser" ).executeUpdate()
+		);
+	}
+
+	@Test
+	public void testGet(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session -> {
+					PK pk = new PK( "Linux" );
+					SystemUser systemUser = session.get( SystemUser.class, pk );
+					assertNotNull(systemUser);
+				}
+		);
+	}
+
+	@Entity(name = "SystemUser")
+	@IdClass(PK.class)
+	public static class SystemUser {
+
+		@Id
+		private String subsystem;
+
+		private String name;
+
+		public PK getId() {
+			return new PK( subsystem );
+		}
+
+		public void setId(PK id) {
+			this.subsystem = id.getSubsystem();
+		}
+
+		public String getSubsystem() {
+			return subsystem;
+		}
+
+		public void setSubsystem(String subsystem) {
+			this.subsystem = subsystem;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+	}
+
+	public static class PK implements Serializable {
+
+		private String subsystem;
+
+		public PK(String subsystem) {
+			this.subsystem = subsystem;
+		}
+
+		private PK() {
+		}
+
+		public String getSubsystem() {
+			return subsystem;
+		}
+
+		public void setSubsystem(String subsystem) {
+			this.subsystem = subsystem;
+		}
+
+	}
+}