Why am I not able to install libgcj6?

.
I am trying to install 'pdftk' (pdf tool kit),
but I am running into one roadblock after another.

First, I saw this message:
Some package request cannot be installed:
pdftk-1.12-2mdk.i586 (due to unsatisfied libgcj.so.6)
Continue?

So, I went looking for libgcj.so.6
The closest I could find was this:
libgcj6-4.0.1-5mdk.i586.rpm

When I tried to install this libgcj...
First, I saw this:
You are about to install the following software package on your computer:
libgcj6-4.0.1-5mdk: GNU Java runtime libraries
You may prefer to just save it. What is your choice?
[Install] [Save] [Cancel]

I chose "Install" and then saw this: 
   Some package requested cannot be installed: 
   libgcj6-4.0.1-5mdk.i586 (due to unsatisfied libgcj6-base[==4.0.1])
   Continue?
   [Abort]    [Ok]

What is going on here?
Why am I not able to install this libgcj6 package?


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