System.setProperty("java.naming.factory.url", "org.eclipse.jetty.jndi");
System.setProperty("java.naming.factory.initial", "org.eclipse.jetty.jndi.InitialContextFactory");

final Server server = new Server(<port>);
final WebAppContext context = new WebAppContext();
context.setContextPath(<context path>);
context.setWar(<path to WAR folder/file>);
context.setServerClasses(new String[] { 
    "org.eclipse.jetty.servlet.ServletContextHandler.Decorator"
 });
        
HandlerCollection handlers = new HandlerCollection();
handlers.setHandlers(new Handler[] {context, new DefaultHandler()});
server.setHandler(handlers);
server.start();