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Webwork 2.2 beta 3 (but should apply to previous versions)
JasperReports 1.1.0
JDK 1.4.2

package com.mevipro.test.action;

import java.util.ArrayList;
import java.util.List;

import net.sf.jasperreports.engine.JasperCompileManager;

import com.mevipro.test.Person;
import com.opensymphony.xwork.ActionSupport;

public class JasperAction extends ActionSupport {

	//basic List - it will serve as our dataSource later on
	private List myList;

	/*
	 * (non-Javadoc)
	 *
	 * @see com.opensymphony.xwork.ActionSupport#execute()
	 */
	public String execute() throws Exception {

		// create some imaginary persons
		Person p1 = new Person(new Long(1), "Patrick", "Lightbuddie");
		Person p2 = new Person(new Long(2), "Jason", "Carrora");
		Person p3 = new Person(new Long(3), "Alexandru", "Papesco");
		Person p4 = new Person(new Long(4), "Jay", "Boss");

		/*
		 * store everything in a list - normally, this should be coming from a
		 * database but for the sake of simplicity, I left that out
		 */
		myList = new ArrayList();
		myList.add(p1);
		myList.add(p2);
		myList.add(p3);
		myList.add(p4);

		/*
		 * Here we compile our xml jasper template to a jasper file.
		 * Note: this isn't exactly considered 'good practice'.
		 * You should either use precompiled jasper files (.jasper) or provide some kind of check
		 * to make sure you're not compiling the file on every request.
		 * If you don't have to compile the report, you just setup your data source (eg. a List)
		 */
		try {
			JasperCompileManager.compileReportToFile(
					"WW_WEBAPP/jasper/our_jasper_template.jrxml",
					"WW_WEBAPP/jasper/our_compiled_template.jasper");
		} catch (Exception e) {
			e.printStackTrace();
			return ERROR;
		}
		//if all goes well ..
		return SUCCESS;
	}

	/**
	 * @return Returns the myList.
	 */
	public List getMyList() {
		return myList;
	}

}

Again, don't use this in production code. You should of course either provide compiled templates, or do some sort of checking to avoid compiling the template on every request. But for our demonstration, or development, this suits our needs just fine.

Use a logger (commons-logging, log4j, ..) to watch com.opensymphony.webwork.views.jasperreports in debug mode, if you have any troubles