That's not likely. The apps don't extend the JVM in any way - they just use it. It's like eglibc and any app on the system. That specific libc is LGPL, but that doesn't mean any application using it has to be using the same license.
Edit: just realised it's not the best example because the apps are actually linking and that's allowed by LGPL. Better one would be probably mono which does use GPL.
* The C# compiler is dual-licensed as MIT and GPL.
* The tools are GPL.
* The runtime is LGPL.
* A few more interesting parts from Microsoft are Microsoft Permissive, with some dual licensed as Apache.
Mono is a bad example because it is not one single license, and Microsoft has been pushing for purging all GPL/LGPL elements from the code to make it easier to push an anti-Linux patent attack.
Edit: just realised it's not the best example because the apps are actually linking and that's allowed by LGPL. Better one would be probably mono which does use GPL.