Saxon

It seems to be the same problem as #6013. The test case is explicitly trying to load "com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl" and that doesn't work in JDK 9+. JAXP (from JDK9) has a mechanism to load the JDK default parser without doing dynamic loading, but we don't provide a way to request that via TransformerFactory properties.

I'm not sure I agree. The #6013 issue is about the illegal reflective access warning message from JDK9, but that is (or claims to be) only a warning. I think this is about the rule for allowed protocols not getting passed all the way through to the resolver, which happily pulls the file URI and causes the test to fail.

In fact commit 1ec3d8b6 fixes this bug on the saxon12 branch by setting the Feature.ALLOWED_PROTOCOLS feature in addition to the factory setting.

I wonder if that was an appropriate fix...given that I can't think of any way to interrogate the factory for the setting later on, I don't think we can do any better...