I'm having problem with a patch file that changes a code comment using "’" (RIGHT SINGLE QUOTATION MARK, UTF-8 U+2019 encoded as 0xE2 0x80 0x99) into the (normal?) apostrophe "'" (APOSTROPHE, ASCII 39/0x27). The patch is created with SVN diff (V1.9) in Linux and can be used fine with GNU patch 2.7.5. However, when uploading the patch to jenkins, it can't be applies- The error is

com.cloudbees.diff.PatchException: Cannot apply hunk @@ 245

I've debugged the issue using diff4j-1.2 (7f212fe6f891e8eaaa349ed9fc6866c9d1280dd2) from https://github.com/cloudbees/diff4j in a test java application. Adding some printouts in

private boolean applyHunk(...)
...
if (!targetLine.equals(hunkLine.substring(1).trim())) { // be optimistic, compare trimmed context lines
    System.out.println("hunk: "+hunkLine);
    System.out.println("target: "+targetLine);

where tries to compare lines, I get this:

hunk: - // this commentâ<U+0080><U+0099>s encoding fails
target: // this comment’s encoding fails

Seems Java does not consider the patch file's line as UTF-8, but the source code's line is taken as UTF-8.