The JNI Way
First of all I started researching Seahorse and it's DBUS API. I was hoping that it's possible to use the java bindings for dbus to store and retrieve passwords but then I realized that in fact it was only possible to store keys with Seahorse dbus and not passwords, so the java dbus api was of no use. I wasted a lot of time on all of this.
My only option was to use libgnome-keyring. Because it has only C and python bindings, I had to use it via JNI. Not knowing anything about Java Native Interface, I started researching again and after a lot of googling and experimenting finally came up with a custom shared library (my C file with a function that lists all keyrings) linked together with libgnome-keyring, and a small java class that loads it and calls the function. It took time and patience but it works - java can talk to GnomeKeyring! Next I'll try password store and retrieve.
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