Correct there aren't now, but a few months back updating or installing Openjdk would pull in half of Gnome. For those of use running KDE and not Gnome that was a big deal. Feel free to check the BTS as there were several bug reports about the issue filed.
The problem has been fixed for a while now, but since java-package has made its way back into Debian it is just as easy to use Oracle Java.
Installing openjdk-7-jre and icedtea-7-plugin would only bring in a couple other packages now.
The following NEW packages will be installed:
icedtea-7-plugin openjdk-7-jre openjdk-7-jre-headless openjdk-7-jre-lib
Whichever one you choose to use, Java is a security black hole. I keep it disabled in all of my browsers and only enable it when absolutely necessary.