HHH-14826 Add test to check regression caused by OneToOne cache support

hibernate-core/src/test/java/org/hibernate/test/onetoone/cache/OneToOneCacheTest.java

@@ -1,11 +1,15 @@
 package org.hibernate.test.onetoone.cache;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertNotNull;
 
 import java.io.Serializable;
 import java.lang.reflect.Constructor;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.atomic.AtomicLong;
 
 import org.hibernate.Session;
 import org.hibernate.Transaction;
@@ -17,6 +21,8 @@ import org.hibernate.stat.spi.StatisticsImplementor;
 import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;
 import org.junit.Test;
 
+import javax.persistence.*;
+
 public class OneToOneCacheTest extends BaseCoreFunctionalTestCase {
 	@Override
 	public String[] getMappings() {
@@ -26,9 +32,18 @@ public class OneToOneCacheTest extends BaseCoreFunctionalTestCase {
         };
     }
     
+	@Override
+	protected Class<?>[] getAnnotatedClasses() {
+		return new Class[] {
+				Product.class,
+				ProductConfig.class
+		};
+	}
+
 	@Override
 	protected void configure(Configuration configuration) {
 		configuration.setProperty(AvailableSettings.USE_SECOND_LEVEL_CACHE, "true");
+		configuration.setProperty(AvailableSettings.JPA_SHARED_CACHE_MODE, "ENABLE_SELECTIVE");
 		configuration.setProperty(AvailableSettings.GENERATE_STATISTICS, "true");
     }
 
@@ -117,4 +132,121 @@ public class OneToOneCacheTest extends BaseCoreFunctionalTestCase {
 	public void OneToOneCacheByRef() throws Exception {
 		OneToOneTest(PersonByRef.class, DetailsByRef.class);
 	}
+
+	@Test
+	public void testFieldShouldNotBeNull2() {
+		final AtomicLong pid = new AtomicLong();
+
+		// create Product
+		inTransaction(s -> {
+			Product product = new Product();
+			s.persist(product);
+			pid.set(product.getId());
+		});
+
+		// create ProductConfig and associate with a Product
+		inTransaction(s -> {
+			Product product = s.find(Product.class, pid.get());
+			ProductConfig config = new ProductConfig();
+			config.setProduct(product);
+			s.persist(config);
+		});
+
+		assertTrue(sessionFactory().getCache().containsEntity(Product.class, pid.get()));
+
+		sessionFactory().getStatistics().clear();
+
+		// now fetch the Product again
+		inTransaction(s -> {
+			Product product = s.find(Product.class, pid.get());
+
+			// should have been from cache
+			assertNotEquals (0, sessionFactory().getStatistics().getSecondLevelCacheHitCount());
+
+			// this should not fail
+			assertNotNull("one-to-one field should not be null", product.getConfig());
+		});
+	}
+
+	@Entity(name = "Product")
+	@Cacheable
+	public static class Product {
+
+		@Id
+		@GeneratedValue
+		private Long id;
+
+		@Version
+		private Integer version;
+
+		@OneToOne(mappedBy = "product", fetch = FetchType.LAZY, cascade = { CascadeType.PERSIST, CascadeType.MERGE })
+		private ProductConfig config;
+
+		public Product() {}
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public Integer getVersion() {
+			return version;
+		}
+
+		public void setVersion(Integer version) {
+			this.version = version;
+		}
+
+		public ProductConfig getConfig() {
+			return config;
+		}
+
+		public void setConfig(ProductConfig config) {
+			this.config = config;
+		}
+	}
+
+	@Entity(name = "ProductConfig")
+	@Cacheable
+	public static class ProductConfig {
+
+		@Id
+		@GeneratedValue
+		private Long id;
+
+		@Version
+		private Integer version;
+
+		@OneToOne(fetch = FetchType.LAZY, cascade = { CascadeType.PERSIST, CascadeType.MERGE })
+		private Product product;
+
+		public ProductConfig() {}
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public Integer getVersion() {
+			return version;
+		}
+
+		public void setVersion(Integer version) {
+			this.version = version;
+		}
+
+		public Product getProduct() {
+			return product;
+		}
+
+		public void setProduct(Product product) {
+			this.product = product;
+		}
+	}
 }