remove two default impls that threw UnsupportedOperationException

hibernate-core/src/main/java/org/hibernate/SessionFactory.java

@@ -235,6 +235,9 @@ default void inStatelessSession(Consumer<StatelessSession> action) {
 	/**
 	 * Open a {@link Session} and use it to perform an action
 	 * within the bounds of a transaction.
+	 *
+	 * @apiNote This method competes with the JPA-defined method
+	 *          {@link #runInTransaction}
 	 */
 	default void inTransaction(Consumer<Session> action) {
 		inSession( session -> manageTransaction( session, session.beginTransaction(), action ) );
@@ -273,6 +276,9 @@ default <R> R fromStatelessSession(Function<StatelessSession,R> action) {
 	/**
 	 * Open a {@link Session} and use it to obtain a value
 	 * within the bounds of a transaction.
+	 *
+	 * @apiNote This method competes with the JPA-defined method
+	 *          {@link #callInTransaction}
 	 */
 	default <R> R fromTransaction(Function<Session,R> action) {
 		return fromSession( session -> manageTransaction( session, session.beginTransaction(), action ) );

hibernate-core/src/main/java/org/hibernate/SharedSessionContract.java

@@ -22,9 +22,12 @@
  */
 public interface SharedSessionContract extends QueryProducer, AutoCloseable, Serializable {
 	/**
-	 * Obtain the tenant identifier associated with this session.
+	 * Obtain the tenant identifier associated with this session, as a string.
 	 *
 	 * @return The tenant identifier associated with this session, or {@code null}
+	 *
+	 * @see org.hibernate.context.spi.CurrentTenantIdentifierResolver
+	 * @see SessionBuilder#tenantIdentifier(Object)
 	 */
 	String getTenantIdentifier();
 
@@ -33,6 +36,9 @@ public interface SharedSessionContract extends QueryProducer, AutoCloseable, Ser
 	 *
 	 * @return The tenant identifier associated with this session, or {@code null}
 	 * @since 6.4
+	 *
+	 * @see org.hibernate.context.spi.CurrentTenantIdentifierResolver
+	 * @see SessionBuilder#tenantIdentifier(Object)
 	 */
 	Object getTenantIdentifierValue();
 
@@ -41,19 +47,20 @@ public interface SharedSessionContract extends QueryProducer, AutoCloseable, Ser
 	 *
 	 * @throws HibernateException Indicates problems cleaning up.
 	 */
+	@Override
 	void close() throws HibernateException;
 
 	/**
 	 * Check if the session is still open.
 	 *
-	 * @return boolean
+	 * @return {@code true} if it is open
 	 */
 	boolean isOpen();
 
 	/**
 	 * Check if the session is currently connected.
 	 *
-	 * @return boolean
+	 * @return {@code true} if it is connected
 	 */
 	boolean isConnected();
 
@@ -62,16 +69,18 @@ public interface SharedSessionContract extends QueryProducer, AutoCloseable, Ser
 	 * If a new underlying transaction is required, begin the transaction. Otherwise,
 	 * continue the new work in the context of the existing underlying transaction.
 	 *
-	 * @return a {@link Transaction} instance
+	 * @return an instance of {@link Transaction} representing the new transaction
 	 *
 	 * @see #getTransaction()
+	 * @see Transaction#begin()
 	 */
 	Transaction beginTransaction();
 
 	/**
 	 * Get the {@link Transaction} instance associated with this session.
 	 *
-	 * @return a Transaction instance
+	 * @return an instance of {@link Transaction} representing the transaction
+	 *         associated with this session
 	 *
 	 * @see jakarta.persistence.EntityManager#getTransaction()
 	 */
@@ -228,10 +237,11 @@ public interface SharedSessionContract extends QueryProducer, AutoCloseable, Ser
 	 * @param work The work to be performed.
 	 *
 	 * @throws HibernateException Generally indicates wrapped {@link java.sql.SQLException}
+	 *
+	 * @apiNote This method competes with the JPA-defined method
+	 *          {@link jakarta.persistence.EntityManager#runWithConnection}
 	 */
-	default void doWork(Work work) throws HibernateException {
-		throw new UnsupportedOperationException();
-	}
+	void doWork(Work work) throws HibernateException;
 
 	/**
 	 * Perform work using the {@link java.sql.Connection} underlying by this session,
@@ -243,10 +253,11 @@ default void doWork(Work work) throws HibernateException {
 	 * @return the result of calling {@link ReturningWork#execute}.
 	 *
 	 * @throws HibernateException Generally indicates wrapped {@link java.sql.SQLException}
+	 *
+	 * @apiNote This method competes with the JPA-defined method
+	 *          {@link jakarta.persistence.EntityManager#callWithConnection}
 	 */
-	default <T> T doReturningWork(ReturningWork<T> work) throws HibernateException {
-		throw new UnsupportedOperationException();
-	}
+	<T> T doReturningWork(ReturningWork<T> work);
 
 	/**
 	 * Create a new mutable {@link EntityGraph} with only a root node.

hibernate-core/src/main/java/org/hibernate/persister/entity/mutation/InsertCoordinatorStandard.java

@@ -24,7 +24,6 @@
 import org.hibernate.generator.OnExecutionGenerator;
 import org.hibernate.generator.values.GeneratedValues;
 import org.hibernate.generator.values.GeneratedValuesMutationDelegate;
-import org.hibernate.id.IdentifierGenerationException;
 import org.hibernate.metamodel.mapping.AttributeMapping;
 import org.hibernate.metamodel.mapping.AttributeMappingsList;
 import org.hibernate.metamodel.mapping.BasicEntityIdentifierMapping;