diff --git a/tooling/metamodel-generator/src/main/java/org/hibernate/processor/util/xml/XmlParserHelper.java b/tooling/metamodel-generator/src/main/java/org/hibernate/processor/util/xml/XmlParserHelper.java
index 5351fa12a3..e13929c39a 100644
--- a/tooling/metamodel-generator/src/main/java/org/hibernate/processor/util/xml/XmlParserHelper.java
+++ b/tooling/metamodel-generator/src/main/java/org/hibernate/processor/util/xml/XmlParserHelper.java
@@ -9,6 +9,7 @@ package org.hibernate.processor.util.xml;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URL;
+import java.util.Optional;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 import javax.tools.FileObject;
@@ -120,7 +121,14 @@ public class XmlParserHelper {
 		ContextProvidingValidationEventHandler handler = new ContextProvidingValidationEventHandler();
 		try {
 			staxEventReader = new JpaNamespaceTransformingEventReader( staxEventReader );
-			JAXBContext jaxbContext = JAXBContext.newInstance( ObjectFactory.class );
+
+			// Class.getClassLoader() may return null if the class was loaded by the bootstrap class loader,
+			// but since we don't expect the annotation processor to be loaded by that class loader,
+			// we expect the return to be non-null and hence cast
+			ClassLoader cl = NullnessUtil.castNonNull( ObjectFactory.class.getClassLoader() );
+			String packageName = NullnessUtil.castNonNull( ObjectFactory.class.getPackage() ).getName();
+			JAXBContext jaxbContext = JAXBContext.newInstance( packageName, cl );
+
 			Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
 			unmarshaller.setSchema( schema );
 			unmarshaller.setEventHandler( handler );