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according to download page, "Java" installer should bundle Tomcat. After downloading DMG and installing, no Tomcat was installed, and I haven't been asked about components/runtimes to install during installation process.
Tomcat is not installed by default. There is "Customize" button on one of the installation panels by clicking which you can enable tomcat installation. http://netbeans.org/community/releases/68/install.html#customizeinstall