Well it kind of depends on what exactly you want to achieve. If you just want to run your GWT app and you don't really care about the URL then just install any Java server (Jetty, Tomcat, Glassfish, Wildfly, ...), deploy your *.war file on it and access it through your server IP address and the default port of your Java server which, in most cases, is 8080.--
But if you want something like http://app.example.com and example.com is managed by Plesk + Apache then you have to read about Apache + reverse proxy because Apache needs to proxy requests to your java server of choice.
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