[Trisquel-users] Where is the JDK stored?

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I'm trying to install NetBeans from the installer offered on their website.  
(I tried installing it from the repositories, but when I tried to create a  
new project I was greeted with a menu that never stopped loading.) If you get  
a few steps into the installation, it wants you to specify a Java Development  
Kit, but none of the offered options seem to work; there's always an error  
message "The installer could not find a compatible JDK installation, specify  
it manually."

What is the path to the IcedTea JDK binaries? Can the installer be satisfied,  
or would I have to install the proprietary version of the JDK for it to  
detect one?