I got a weird XML parsing error all of a sudden and would like to go to the bottom of it, real time debugging a SAX parser doesn't seem to work out.
I noticed in this code base of XMLDocumentFragmentScannerImpl there'r some flags that enabled debugging, however they are static final default to false:

Anyone knows if these can be turned on by some mechanism?
Is there a source repo I can rebuild into maven artifact? I tried to copy these out from java/8.0.242-amzn/jre/lib/rt.jar and rebuilt them but it only bring up a chain of other missing classes that never end.