[tor-dev] Question to Java developers: what are good frameworks for Tor's server-side Java applications

another_base_name2001 another_base_name2001-debase at yahoo.com
Tue May 20 20:35:19 UTC 2014

You could try Spring. It seems to be a common framework for Server Side 

Noah Rahman wrote:
> Hi Karsten,
> A lot of people I respect seem to use Dropwizard for this sort of thing.
> https://dropwizard.github.io/dropwizard/
> As for deployment on Debian (dunno if it's in the standard Debian 
> universe)
> https://groups.google.com/d/msg/dropwizard-user/gv4TDQbcHBc/LGJz0egMNWQJ
> Hope that helps
> Best
> Noah
> On Tue, May 20, 2014 at 12:54 PM, Karsten Loesing 
> <karsten at torproject.org <mailto:karsten at torproject.org>> wrote:
>     Hello devs,
>     I'm seeking advice from people with experience in writing server-side
>     Java applications.
>     Let me give you some background about this request: for the past five
>     years, I have been developing server-side Java applications which all
>     process large amounts of Tor directory data and provide their
>     output via
>     a web interface.
>     Examples:
>      - The metrics data processor (metrics-db) fetches Tor descriptors
>     from
>     the Tor directory authorities, the bridge authority, etc.,
>     performs some
>     sanity-checks, and provides descriptors by type as tarballs.  We're
>     talking about roughly 7 GiB new bzip2-compressed data per month.
>      - The metrics website (metrics-web) uses the output from the metrics
>     data processor, stuffs everything into a database, computes
>     aggregates,
>     and presents results in graphs and .csv files.
>      - The Onionoo service processes the same data from the metrics data
>     processor, but provides statistics per Tor relay, not for the Tor
>     network as a whole.  The processing is done every two hours and
>     may take
>     30 minutes to 1.5 hours, depending on how overloaded the server is.
>      - The ExoneraTor service, again, uses the same data and puts it in a
>     database to answer whether a certain IP address has been a Tor
>     relay at
>     some point in the past.
>     That's what is done.  And here's how it's done under the surface:
>      - There's one or more cronjobs, each of which starts an ant task to
>     process data.  Some of these tasks import data into the database,
>     others
>     store results in the file system.
>      - Each application uses a web application deployed in Tomcat to
>     provide
>     results to web users.  Most things are written in servlets, some
>     use JSPs.
>     My problem is that this approach is rather fragile and difficult to
>     setup for new volunteers.  I'm aware of that, and I'd like to
>     improve it.
>     My question is: what Java frameworks should I be looking at for the
>     applications described above?  Bonus points if something is in Debian
>     stable.
>     Note that "switch to $some_other_programming_language" is not a very
>     useful answer to me, at least not for the larger applications.
>      There's
>     just too much existing code and not enough developer time to port it.
>     Thanks in advance!
>     All the best,
>     Karsten
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