In the light of https://git-scm.com/docs/user-manual#tree-object :

Note that the files all have mode 644 or 755: Git actually only pays attention to the executable bit.

I checked the filemode of resteasy project files and found that there are many files with mode 100755 with no reason for it (*.java, *.xml)

git ls-tree -r origin/master | grep "^100755"