A GSP (Groovy Server Pages) variation of the technique

spaceship.gsp

<% import org.codehaus.groovy.control.CompilerConfiguration %>
<% import org.wyttenbach.dale.groovy.spaceship.* %>
<%
response.setHeader("Cache-Control","no-cache");
response.setHeader("Pragma","no-cache");
response.setDateHeader ("Expires", 0);
%>
<link rel="stylesheet" href="css/sample.css" type="text/css">

Here is a bunch of text

<hr/>

<% 
// create a configuration
def config = new CompilerConfiguration()
// tweak the configuration
config.scriptBaseClass = 'org.wyttenbach.dale.groovy.spaceship.EngineScript'
// run your script
def shell = new GroovyShell(config)

def reader = new InputStreamReader(context.getResourceAsStream('/engine.groovy'))
engineScript = shell.evaluate(reader)
assert engineScript instanceof Engine
engineScript.start()
engineScript.stop()

%>

Note that the start/stop messages appear in the log, not on the page.
I am using maven jetty plugin for testing