I have issues with java applications (they deadlock a short time after start) that is impossible to narrow down. But I suspect the kernel.
Is there any way to install 3.x kernel in Tumbleweed?
Of course.
Just like you would install any other kernel.
Or are you asking for a repo?
Here’s the latest 13.2 kernel (3.16.x):
http://download.opensuse.org/repositories/Kernel:/openSUSE-13.2/standard/