Why can't I run my Java program with just the JRE, the JDK is required?

I've recently written 3 programs in Java using the Netbeans IDE with JDK 1.6 as the default Java platform. The compile-time libraries include the Swing Application Framework. I use BuildDesk from ProductiveMe to package the each program into a Windows installer.
When I install the programs on a new computer without a JRE or JDK being present, and attempt to run them I get an error (as expected) stating that there is no JVM. The messages says that I need to install JDK 1.3 or higher. I downloaded the latest JRE onto the new computer and attempted to run the programs and I get the same error message. My question is, why can't I run these programs with just the JRE installed? Why do I need the JDK? When I install the JDK, the programs run fine. The typical user may not have the JDK on their system, but they likely have the JRE if they've run Java programs before.
Is the answer as simple as there must be library functions being used by the programs that belong to the JDK, but not the JRE? I'd rather a user not have to install the JDK verses the JRE because they may also have to update some Windows environment variables.
Thank you for any help on this issue.

915088 wrote:
Thanks for your replies. I further investigated BuildDesk and found an option which allows a JVM check but that check needs the JDK. I stopped the JVM check and rebuilt using BuildDesk and it now only requires the JRE to run the programs. The reason why I use BuildDesk is to package more than just the jar file for the user. BuildDesk allows me to create a installation folder structure as well as include any other files in the build. I could just as well zipped all this together for the user but decided against that method.I don't think anyone will question your usage of an installer tool; that is entirely up to you. But what is questionable is that you have problems with that installer tool and then go look for help in a Java programming forum. The next time, go look for help at the source. If there is no way to acquire help (support, a forum, a mailinglist, anything) then that is a very good reason to not use the product in question.

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