HHH-18139 throw an exception when assigned id is null in StatelessSession.insert()

Signed-off-by: Gavin King <gavin@hibernate.org>

Author: gavinking

hibernate-core/src/main/java/org/hibernate/internal/StatelessSessionImpl.java

@@ -54,6 +54,7 @@
 import org.hibernate.generator.values.GeneratedValues;
 import org.hibernate.graph.GraphSemantic;
 import org.hibernate.graph.spi.RootGraphImplementor;
+import org.hibernate.id.IdentifierGenerationException;
 import org.hibernate.loader.ast.spi.CascadingFetchProfile;
 import org.hibernate.metamodel.mapping.PluralAttributeMapping;
 import org.hibernate.persister.collection.CollectionPersister;