Recently been working with oauth2 and bumped into a problem with missing certificates in the cacerts.txt files. I worked around the problem by adding the certificates to the file.

The certificates are from Comodo, they seem to be trusted by the major browser vendors, so would it make sense to add these to the cacerts file?

The certificate bundle from them solved my problems (https://support.comodo.com/index.php?_m=downloads&_a=viewdownload&downloaditemid=123&nav=0,1,27).