Saxon

We have a unit test that is doing

factory.setAttribute(FeatureKeys.SOURCE_PARSER_CLASS, "com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl");

with the intent of ensuring that the default JDK XML parser is loaded, even if another SAX parser (such as Apache Xerces) is available on the classpath.

This fails (or gives warnings) on JDK 9+ because dynamic loading of internal classes ("com.sun.org...") is no longer allowed. The message is:

WARNING: An illegal reflective access operation has occurred

JDK 9 provides a way to get the default parser using SAXParserFactory.getDefaultInstance(), but we don't provide a way to request that using Saxon configuration properties.

I propose that we recognize the setting

factory.setAttribute(FeatureKeys.SOURCE_PARSER_CLASS, "#DEFAULT");

as a way of requesting the default internal parser.

Note that internally, we have code in JavaPlatform.loadParserForXmlFragments() that does what's needed, using either the JDK8 or JDK9 approach as appropriate.