[balamaci]

And to go even lighter I use pippo(https://github.com/decebals/pippo). I like the modular way that allows me to tailor my apps to be <1MB final size. Really helps with lightning fast deployments on my many DigitalOcean smallest 512MB instances.It also works great on raspberry pies - I was using nodejs webapps until pippo because they were lighter on resources(I rather hate js and nodejs and hence the praise for pippo) . I also pair it with jooq for db access when needed.

[ww520]

Pippo looks pretty sweet. How does it compare to Spark?

[reactor]

I'm trying pippo for the last couple of weeks, its quite lightweight and really fast. I could customize it for whenever the need arises, better than sparkjava. For eg: I couldn't customize the Jetty server params with sparkjava, I could with pippo.

[decebals]

I don't know many things about Spark, so I can't make a full comparison. I will try bellow to enumerate some advantages of Pippo:

- modular [1] (spark uses a giant static singleton architecture)

- support (via modules) for many Template Engines [2] (Freemarker, Jade, Groovy, Trimou, Pebble)

- support (via modules) for many Servers [3] (Jetty, Undertow, TJWS); spark depends on Jetty

- directly serving of static resources [4], support for WebJar

- content type negotiation

- custom session [5] (support for cookie based implementation)

- support (via modules) for many ContentTypeEngines [6] (Plain text, Json - Gson/Fastjson, Xml - Jaxb/Xstream, Yaml - SnakeYaml)

- i18n [7] (in java or directly in template)

- support (via modules) for many IoC [8] (Guice, Spring)

- support metrics [9] (via modules - Ganglia, Graphite, InfluxDB, Librato)

- custom (template) error pages

- regex routes

Unfortunately the actual documentation of Pippo it's a little bit behind of the implementation (from documentation are missing some nice concepts: named routes, finally filters, custom route context, ...) and from this reason I cannot give you more useful links but I will fix this aspect asap.

Another difference in Pippo to other (micro) java web framework (spark, ninja) is that a RouteHandler it's a real endpoint (the handle method return void). You can finalize/commit the response using send, render, redirect. Everything is transparent.

[1] http://www.pippo.ro/doc/modularity.html

[2] http://www.pippo.ro/doc/templates.html

[3] http://www.pippo.ro/doc/server.html

[4] http://www.pippo.ro/doc/static-files.html

[5] http://www.pippo.ro/doc/session.html

[6] http://www.pippo.ro/doc/content-types.html

[7] http://www.pippo.ro/doc/internationalization.html

[8] http://www.pippo.ro/mod/spring.html

[9] http://www.pippo.ro/mod/metrics.html