For a non-trivial example of a web application, check out http://www.dynamicalsoftware.com/software/architecture/oss/clojure http://www.dynamicalsoftware.com/so

For a non-trivial example of a web application, check out http://www.dynamicalsoftware.com/software/architecture/oss/clojure http://www.dynamicalsoftware.com/software/architecture/oss/c... which documents the making of a news feed service that is written in clojure and combines lots of other open source technology such as postgresql, cassandra, solr, redis, and kafka.