It is always recommended to deliver a JRE with your Eclipse-Product, because it has tow major advantages.

1. The client needn’t to install java (probably he doesn’t have the rights or the competence).
2. You can be sure that all your clients use the same version and vendor of the vm.

But theres also a great advantage: Sun doesn’t provide by default a manifest-file for displaying the widgets in the current theme of your operating-system (see http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6178745), but uses the default look&feel of Windows. To fix this you need to the javaw.exe.manifest, located in your org.eclipse.swt.win32.win32.x86_x.y.z.jar-Plugin Package.

To bundle your VM, just create a folder “jre” in your [Eclipse-Root]-Directory copy the vm, take the Manifest-file and copy it to [Eclipse-Root]/jre/bin