Merge Hibernate Tools into ORM : Fix failing test on Oracle and Graal platforms

Author: koentsje

tooling/hibernate-reveng/src/main/java/org/hibernate/tool/reveng/internal/xml/AbstractXMLPrettyPrinterStrategy.java

@@ -22,10 +22,10 @@
 
 public abstract class AbstractXMLPrettyPrinterStrategy implements XMLPrettyPrinterStrategy {
 
+	private static DocumentBuilderFactory documentBuilderFactory = null;
+
 	protected Document newDocument(String xml, String encoding) throws SAXException, IOException, ParserConfigurationException {
-		final DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
-		dbf.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
-		final Document document = dbf
+		final Document document = getDocumentBuilderFactory()
 				.newDocumentBuilder()
 				.parse(new InputSource(new ByteArrayInputStream(xml.getBytes(encoding))));
 		document.normalize();
@@ -43,4 +43,39 @@ protected void removeWhitespace(final Document document) throws XPathExpressionE
 			node.getParentNode().removeChild(node);
 		}
 	}
+
+	private static DocumentBuilderFactory getDocumentBuilderFactory() {
+		if (documentBuilderFactory == null) {
+			documentBuilderFactory = createDocumentBuilderFactory();
+		}
+		return documentBuilderFactory;
+	}
+
+	private static DocumentBuilderFactory createDocumentBuilderFactory() {
+		DocumentBuilderFactory result = null;
+		// Save the documentBuilderFactoryClass and set it to the default jre version
+		String documentBuilderFactoryClass = System.getProperty( "javax.xml.parsers.DocumentBuilderFactory" );
+		System.setProperty(
+				"javax.xml.parsers.DocumentBuilderFactory",
+				"com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl");
+		try {
+			result = DocumentBuilderFactory.newInstance();
+			result.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
+		}
+		catch (ParserConfigurationException e) {
+			throw new RuntimeException(e);
+		}
+		finally {
+			// Restore the documentBuilderFactory class
+			if (documentBuilderFactoryClass != null) {
+				System.setProperty(
+						"javax.xml.parsers.DocumentBuilderFactory",
+						documentBuilderFactoryClass );
+			}
+			else {
+				System.clearProperty( "javax.xml.parsers.DocumentBuilderFactory" );
+			}
+		}
+		return result;
+	}
 }