HHH-15045 + HHH-15235 onFlushDirty() invoked on parent entity in a @OnetoOne relationship when no table columns are changed - PropertyAccessException on merging Bidirectional OneToOne with EmbeddedId - Reverted HHH-14216

Author: dreab8

changelog.txt

@@ -500,7 +500,7 @@ https://hibernate.atlassian.net/projects/HHH/versions/31844
     * [HHH-14257] - An Entity A with a map collection having as index an Embeddable with a an association to the Entity A fails with a NPE
     * [HHH-14251] - Invalid SQL for @Embedded UPDATE
     * [HHH-14249] - MultiLineImport fails when script contains blank spaces or tabs at the end of the last sql statement
-
+    * [HHH-14216] - Second-level cache doesn't support @OneToOne
 
 Changes in 5.4.14.Final (April 6, 2020)
 ------------------------------------------------------------------------------------------------------------------------

hibernate-core/src/main/java/org/hibernate/type/OneToOneType.java

@@ -152,19 +152,12 @@ public boolean isOneToOne() {
 
 	@Override
 	public boolean isDirty(Object old, Object current, SharedSessionContractImplementor session) {
-		if ( isSame( old, current ) ) {
-			return false;
-		}
-
-		Object oldid = getIdentifier( old, session );
-		Object newid = getIdentifier( current, session );
-
-		return getIdentifierType( session ).isDirty( oldid, newid, session );
+		return false;
 	}
 
 	@Override
 	public boolean isDirty(Object old, Object current, boolean[] checkable, SharedSessionContractImplementor session) {
-		return isDirty(old, current, session);
+		return false;
 	}
 
 	@Override
@@ -203,36 +196,25 @@ public boolean useLHSPrimaryKey() {
 
 	@Override
 	public Serializable disassemble(Object value, SharedSessionContractImplementor session, Object owner) throws HibernateException {
-		if (value == null) {
-			return null;
-		}
-
-		Object id = ForeignKeys.getEntityIdentifierIfNotUnsaved( getAssociatedEntityName(), value, session );
-
-		if ( id == null ) {
-			throw new AssertionFailure(
-				"cannot cache a reference to an object with a null id: " +
-				getAssociatedEntityName()
-			);
-		}
-
-		return getIdentifierType( session ).disassemble( id, session, owner );
+		return null;
 	}
 
 	@Override
 	public Object assemble(Serializable oid, SharedSessionContractImplementor session, Object owner) throws HibernateException {
-		//the owner of the association is not the owner of the id
-		Serializable id = ( Serializable ) getIdentifierType( session ).assemble( oid, session, null );
-
-		if ( id == null ) {
-			return null;
-		}
-
-		return resolveIdentifier( id, session );
+		//this should be a call to resolve(), not resolveIdentifier(),
+		//'cos it might be a property-ref, and we did not cache the
+		//referenced value
+		return resolve( session.getContextEntityIdentifier(owner), session, owner );
 	}
 
+	/**
+	 * We don't need to dirty check one-to-one because of how
+	 * assemble/disassemble is implemented and because a one-to-one
+	 * association is never dirty
+	 */
 	@Override
 	public boolean isAlwaysDirtyChecked() {
-		return true;
+		//TODO: this is kinda inconsistent with CollectionType
+		return false;
 	}
 }

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

@@ -14,6 +14,8 @@
 import org.hibernate.cfg.Configuration;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
 import org.hibernate.stat.spi.StatisticsImplementor;
+
+import org.hibernate.testing.FailureExpected;
 import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;
 import org.junit.Test;
 
@@ -109,6 +111,7 @@ private <TPerson extends Person> List<TPerson> getPersons(Class<TPerson> personC
 	}
 
 	@Test
+	@FailureExpected( jiraKey = "HHH-14216", message = "The changes introduces by HHH-14216 have been reverted see https://github.com/hibernate/hibernate-orm/pull/5061 discussion")
 	public void OneToOneCacheByForeignKey() throws Exception {
 		OneToOneTest(PersonByFK.class, DetailsByFK.class);
 	}