Return value from groovy script to java servlet

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Hi

I am very new to groovy and having trouble with some parts.

I have a jsp page tied to a servlet that runs groovy scripts. I am able to get to the groovy script from the servlet. But after the script runs how do I return the response from the groovy script back to the servlet to be displayed in the jsp page?

My java servlet code is as follows:

File file = new File(“TestScript.groovy”);
ClassLoader parent = getClass().getClassLoader();
GroovyClassLoader loader = new GroovyClassLoader(parent);
Class groovyClass = loader.parseClass(file);
Object[] args = {};
GroovyObject groovyObject = (GroovyObject) groovyClass.newInstance();
Object ret = groovyObject.invokeMethod(“runTest”, args);

In my TestScript.groovy i have the following:
class TestScript
{

@Test
public String runTest()
{
       //run test

return response

}

}

I get the following exception:
groovy.lang.MissingPropertyException: No such property: output for class: