Inspect serialized file content

I have a file which oblivios contains serialized structures. The first 26 bytes contain the string "java.util.HashMap" so I am sure that this file holds serialized data.

My question is now is there is nice tool maybe with a simple UI where I can show the structured data?

I googled for it for a while, but I didn't find any propper resources. It should run prefered on Windows, Linux would be fine too but is overhead for me.