How can I get an hash/md5 from an object?

You could write a custom hashCode method that uses a slightly altered version of the hashCode algorithm in the String class. From the Oracle documentation, the String hashCode is computed as follows.

You can concatenate all of the strings, and then do a hash of your choosing on it. If the string is null, you can use "Null" or any other string -- it really doesn't matter as long as you're consistent.

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