HHH-20229 Add reproducer test for EntityPrinter failure with @AnyKeyJavaClass(String)

Add a test reproducing a HibernateException thrown during
logFlushResults when an @Any association uses
@AnyKeyJavaClass(String.class).

Author: utsavNoovosoft

hibernate-core/src/test/java/org/hibernate/orm/test/any/AnyTypeFlushToLoggableStringTest.java

@@ -0,0 +1,80 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.any;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import org.hibernate.internal.CoreMessageLogger;
+import org.jboss.logging.Logger;
+import org.hibernate.annotations.Any;
+import org.hibernate.annotations.AnyDiscriminatorValue;
+import org.hibernate.annotations.AnyKeyJavaClass;
+import org.hibernate.testing.orm.junit.EntityManagerFactoryScope;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.hibernate.testing.orm.junit.Jpa;
+import org.junit.jupiter.api.Test;
+
+import static org.hibernate.testing.logger.LogLevelContext.withLevel;
+
+
+/**
+ * Test case reproducing an issue in EntityPrinter.logEntities during logFlushResults,
+ * where a HibernateException is thrown while attempting to wrap an entity as a String.
+ * <p>
+ * The failure occurs when an @Any association uses a String identifier via @AnyKeyJavaClass(String.class),
+ * leading Hibernate to incorrectly attempt a conversion using StringJavaType.
+ *
+ * @author Vincent Bouthinon
+ * @author Utsav Mehta
+ */
+@Jpa(annotatedClasses = {AnyTypeFlushToLoggableStringTest.Book.class})
+@JiraKey("HHH-20229")
+class AnyTypeFlushToLoggableStringTest {
+
+	@Test
+	void testLogEntityWithAnyKeyJavaClassAsString(EntityManagerFactoryScope scope) {
+		try (
+				var l1 = withLevel( CoreMessageLogger.NAME, Logger.Level.DEBUG );
+		) {
+			scope.inTransaction(
+					entityManager -> {
+						Book book = new Book();
+						Book origin = new Book();
+						book.setOrigin( origin );
+						entityManager.persist( origin );
+						entityManager.persist( book );
+						entityManager.flush();
+						entityManager.clear();
+					}
+			);
+		}
+	}
+
+	@Entity(name = "book")
+	public static class Book {
+
+		@Id
+		@GeneratedValue
+		private String id;
+
+		@Any
+		@AnyKeyJavaClass(String.class)
+		@JoinColumn(name = "origin_id")
+		@Column(name = "origin_type")
+		@AnyDiscriminatorValue(discriminator = "BOOK", entity = Book.class)
+		private Object origin;
+
+		public Object getOrigin() {
+			return origin;
+		}
+
+		public void setOrigin(Object origin) {
+			this.origin = origin;
+		}
+	}
+}