Due to the combination of a Limitation of dependencies on RPM's and possible Oracle JRE packaging issues - the Oracle jdk can be installed with out having a jre known by the package manager.
This causes issues like those seen in ZD 6257 and OpenDJ-1240
To avoid this, we could simply remove the dependency for the jre or jdk as part of the rpm package.
Considering a jvm can be installed with no rpm at all (from .zip file) - it makes sense to remove the dependency in our rpm. The product will not run with out a jre installed, and this is clear as part of the installation instructions. There's no need to abort the rpm installation if the package management system can't find a jre package.