NIFI-6301 - Fixed unit test. Added comments.
NIFI-6301 - Removed unused rule from test.
NIFI-6301 - Changed read() methods to use a boolean instead. Updated comments.
NIFI-6301 - Fixing checkstyle errors.
NIFI-6301 - Added an XXE Validator to do a simple regex check on files that contain XXE declarations. Added unit tests and related XML test files.
NIFI-6301 - Forgot license headers. Fixed a unit test.
NIFI-6301 - Refactored duplicate code for error handling.
NIFI-6301 - Removed unused imports.
NIFI-6301 - Slightly changed messaging language.
NIFI-6301 - Added logic to catch multiline XXE attacks.
Added logging messages.
Updated unit test.
This closes#3507.
Co-authored-by: Andy LoPresto <alopresto@apache.org>
Signed-off-by: Andy LoPresto <alopresto@apache.org>