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Mostly doing this article as a note for the correct way to install java jdk or runtime for kali or debian wheezy.

Download either the jdk or jre tar.gz package from oracle

Install the java-package from debian

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apt-get install java-package

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Use the make-jpkg command as a normal user to create a debian package from the downloaded archive

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fakeroot make-jpkg /path/to/downloaded/jdk-7u21-linux-x64.tar.gz

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Once it completes you should see:

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The Debian package has been created in the current directory. You can
install the package as root (e.g. dpkg -i oracle-j2sdk1.7_1.7.0+update21_amd64.deb).

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Install the package:

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sudo dpkg -i oracle-j2sdk1.7_1.7.0+update21_amd64.deb

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Locate the libnpjp2.so file so you can enable support for java in iceweasel:

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$ dpkg -L oracle-j2sdk1.7 | grep libnpjp2.so
/usr/lib/jvm/j2sdk1.7-oracle/jre/lib/amd64/libnpjp2.so

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Create the symlink to the file:

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cd /etc/alternatives

sudo ln -s /usr/lib/jvm/j2sdk1.7-oracle/jre/lib/amd64/libnpjp2.so mozilla-javaplugin.so

cd /usr/lib/mozilla/plugins

sudo ln -s /etc/alternatives/mozilla-javaplugin.so mozilla-javaplugin.so

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Once this is done, close your browser then open it up and visit the java test page (you will need to allow the plugin to run).