JD-GUI is a standalone graphical utility that displays Java source codes of “.class” files. You can browse the reconstructed source code with the JD-GUI for instant access to methods and fields.
This java decompiler has GNU/Linux version available for download, but the site don’t mention anything about the dependencies of the package. It’s up to the user to find and install the required libraries in order to run JD-GUI.
For the x64 version of OpenSUSE install the following packages:
zypper in libgtk-2_0-0-32bit libgthread-2_0-0-32bit libXxf86vm1-32bit
For the x86 version install:
zypper in libgtk-2_0-0 libgthread-2_0-0 libXxf86vm1