HHH-11147 - Allow enhanced entities to be returned in a completely uninitialized state

(cherry picked from commit 94c49aaaa6)

hibernate-core/src/main/java/org/hibernate/bytecode/enhance/spi/interceptor/EnhancementAsProxyLazinessInterceptor.java

@@ -6,11 +6,13 @@
  */
 package org.hibernate.bytecode.enhance.spi.interceptor;
 
+import java.io.Serializable;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.Set;
 
 import org.hibernate.EntityMode;
+import org.hibernate.HibernateException;
 import org.hibernate.LockMode;
 import org.hibernate.bytecode.BytecodeLogger;
 import org.hibernate.bytecode.enhance.spi.LazyPropertyInitializer;
@@ -22,6 +24,7 @@ import org.hibernate.internal.util.collections.ArrayHelper;
 import org.hibernate.persister.entity.EntityPersister;
 import org.hibernate.tuple.entity.EntityTuplizer;
 import org.hibernate.type.CompositeType;
+import org.hibernate.type.Type;
 
 /**
  * @author Steve Ebersole
@@ -213,16 +216,29 @@ public class EnhancementAsProxyLazinessInterceptor extends AbstractLazyLoadInter
 		}
 
 		if ( identifierAttributeNames.contains( attributeName ) ) {
-			EnhancementHelper.performWork(
-					this,
-					(session, isTempSession) -> session.getFactory()
-							.getMetamodel()
-							.entityPersister( getEntityName() )
-							.getEntityTuplizer()
-							.getPropertyValue( target, attributeName ),
-					getEntityName(),
-					attributeName
-			);
+			// it is illegal for the identifier value to be changed.  Normally Hibernate
+			// validates this during flush.  However, here it is dangerous to just allow the
+			// new value to be set and continue on waiting for the flush for validation
+			// because this interceptor manages the entity's entry in the PC itself.  So
+			// just do the check here up-front
+			final boolean changed;
+			if ( nonAggregatedCidMapper == null ) {
+				changed = ! entityKey.getPersister().getIdentifierType().isEqual( oldValue, newValue );
+			}
+			else {
+				final int subAttrIndex = nonAggregatedCidMapper.getPropertyIndex( attributeName );
+				final Type subAttrType = nonAggregatedCidMapper.getSubtypes()[subAttrIndex];
+				changed = ! subAttrType.isEqual( oldValue, newValue );
+			}
+
+			if ( changed ) {
+				throw new HibernateException(
+						"identifier of an instance of " + entityKey.getEntityName() + " was altered from " + oldValue + " to " + newValue
+				);
+			}
+
+			// otherwise, setId has been called but passing in the same value - just pass it through
+			return newValue;
 		}
 
 		if ( ! inLineDirtyChecking ) {

hibernate-core/src/main/java/org/hibernate/engine/spi/EntityKey.java

@@ -74,6 +74,10 @@ public final class EntityKey implements Serializable {
 		return persister.getEntityName();
 	}
 
+	public EntityPersister getPersister() {
+		return persister;
+	}
+
 	@Override
 	public boolean equals(Object other) {
 		if ( this == other ) {

hibernate-core/src/test/java/org/hibernate/test/bytecode/enhancement/lazy/proxy/SetIdentifierOnAEnhancedProxyTest.java

@@ -95,13 +95,11 @@ public class SetIdentifierOnAEnhancedProxyTest extends BaseNonConfigCoreFunction
 
 					loadedChild.setId( lastChildID );
 
-					// ^ should have triggered "base fetch group" initialization which would mean a SQL select
-					assertEquals( 1, stats.getPrepareStatementCount() );
+					assertEquals( 0, stats.getPrepareStatementCount() );
 
 					// check that the `#setName` "persisted"
 					assertThat( loadedChild.getId(), is( lastChildID ) );
-					assertEquals( 1, stats.getPrepareStatementCount() );
-
+					assertEquals( 0, stats.getPrepareStatementCount() );
 				}
 		);
 
@@ -114,7 +112,6 @@ public class SetIdentifierOnAEnhancedProxyTest extends BaseNonConfigCoreFunction
 
 	}
 
-	@Ignore
 	@Test(expected = PersistenceException.class)
 	public void updateIdTest() {
 		final Statistics stats = sessionFactory().getStatistics();
@@ -133,13 +130,11 @@ public class SetIdentifierOnAEnhancedProxyTest extends BaseNonConfigCoreFunction
 
 					loadedChild.setId( updatedId );
 
-					// ^ should have triggered "base fetch group" initialization which would mean a SQL select
-					assertEquals( 1, stats.getPrepareStatementCount() );
+					assertEquals( 0, stats.getPrepareStatementCount() );
 
 					// check that the `#setName` "persisted"
 					assertThat( loadedChild.getId(), is( updatedId ) );
-					assertEquals( 1, stats.getPrepareStatementCount() );
-
+					assertEquals( 0, stats.getPrepareStatementCount() );
 				}
 		);