HHH-18945 Test case - entity class extends mapped superclass with same simple class name

tooling/metamodel-generator/src/test/java/org/hibernate/processor/test/classnamecollision/ClassNameCollisionTest.java

@@ -0,0 +1,34 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.processor.test.classnamecollision;
+
+import org.hibernate.processor.test.util.CompilationTest;
+import org.hibernate.processor.test.util.WithClasses;
+import org.junit.Test;
+
+import static org.hibernate.processor.test.util.TestUtil.assertMetamodelClassGeneratedFor;
+import static org.hibernate.processor.test.util.TestUtil.getMetaModelSourceAsString;
+import static org.hibernate.processor.test.util.TestUtil.getMetamodelClassFor;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class ClassNameCollisionTest extends CompilationTest {
+
+	@Test
+	@WithClasses({
+			Something.class,
+			org.hibernate.processor.test.classnamecollision.somewhere.Something.class
+	})
+	public void testAmbiguousSimpleName() {
+		System.out.println( getMetaModelSourceAsString( Something.class ) );
+		assertMetamodelClassGeneratedFor( Something.class );
+		System.out.println( getMetaModelSourceAsString( org.hibernate.processor.test.classnamecollision.somewhere.Something.class ) );
+		assertMetamodelClassGeneratedFor( org.hibernate.processor.test.classnamecollision.somewhere.Something.class );
+		assertEquals(
+				getMetamodelClassFor( org.hibernate.processor.test.classnamecollision.somewhere.Something.class ).getName(),
+				getMetamodelClassFor( Something.class ).getSuperclass()
+						.getName() );
+	}
+
+}

tooling/metamodel-generator/src/test/java/org/hibernate/processor/test/classnamecollision/Something.java

@@ -0,0 +1,12 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.processor.test.classnamecollision;
+
+import jakarta.persistence.Entity;
+
+@Entity
+public class Something extends org.hibernate.processor.test.classnamecollision.somewhere.Something {
+	String alphaValue;
+}

tooling/metamodel-generator/src/test/java/org/hibernate/processor/test/classnamecollision/somewhere/Something.java

@@ -0,0 +1,12 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.processor.test.classnamecollision.somewhere;
+
+import jakarta.persistence.MappedSuperclass;
+
+@MappedSuperclass
+abstract public class Something {
+	String name;
+}