The devstudio 10.2 installation guide will need to remove unneeded repo configuration parameters, enable gpg check and also add step describing how to add signing key.

So, please in chapter "6. Installing JBoss Developer Studio Using RPM":

1. Remove these parameters form rh-eclipse46-devstudio-stable-10_x.repo:
   sslverify=0
   includepkgs=rh-eclipse*
   skip_if_unavailable=1
2. Change gpgcheck=0 to gpgcheck=1
3. And add this step before "yum install":
   Install product signing (GPG) key
   rpm --import "http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x08B871E6A5787476"