There are user cases when they need to install JReport Server into application servers in the cloud and may not even own a machine of the type the application servers are installing to. For example you use Tomcat on Unix in a cloud environment but only have Windows machines available locally. You can then install JReport Server on Windows, make a war file and deploy it to the Java application server on Unix.
makewar.bat -Dreporthome=/opt/reporthome
jreport.war/WEB-INF/lib
directory.http://<host>:8080/
(8080 is the default port of Tomcat), and deploy the WAR using your application server user interface. http://<host>:8080/jreport
(assuming the war file is jreport.war) as an administrator to configure the server database.