jfinal-ext 关于PoiRender导出excel但是无数据.?报错

使用：jfinal-ext: 3.1.4         jfinal 2.0

代码如下：

        UserRecord user= getSessionAttr("user");

			String []  header={"编号","证件号码","加入时间","驾龄","电话"};
			String []  columns={"id","transport_license","create_time","driving_time","phone_number"};

			int userid=user.getInt("id");
			List<CarinfoRecord> objs= carInfoService.findCarsByUser(userid);
			  List<Object> data = new ArrayList();
			for(int i=0;i<objs.size();i++){
				Map<String, Object > map=new HashMap<String, Object>();
				map.put(columns[0], objs.get(i).getInt(columns[0]));
				map.put(columns[1], objs.get(i).getStr(columns[1]));
				map.put(columns[2], objs.get(i).getStr(columns[2]));
				map.put(columns[3], objs.get(i).getInt(columns[3]));
				map.put(columns[4], objs.get(i).getStr(columns[4]));
				System.out.println(map.get(columns[0])+"0000000000000");
				System.out.println(map.get(columns[1])+"1111111111111");
				System.out.println(map.get(columns[2])+"2222222222222");
				System.out.println(map.get(columns[3])+"3333333333333");
				System.out.println(map.get(columns[4])+"4444444444444");
				
				data.add(map);
				
			}
			
			System.out.println(JSON.toString(objs));
		
			Render poiRender=PoiRender.me(data).fileName("carInfo.xls").headers(header).columns(columns);
			render(poiRender);

system.out都有数据在。

报错如下：

[ERROR]-[Thread: qtp15565667-17]-[com.jfinal.core.ActionHandler.handle()]: /carInfo/carsToExc
java.lang.NoClassDefFoundError: org/apache/poi/ss/usermodel/Workbook
	at com.jfinal.ext.render.excel.PoiRender.render(PoiRender.java:57)
	at com.jfinal.core.ActionHandler.handle(ActionHandler.java:93)
	at com.jfinal.core.JFinalFilter.doFilter(JFinalFilter.java:72)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1307)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:453)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:560)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1072)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:382)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1006)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
	at org.eclipse.jetty.server.Server.handle(Server.java:365)
	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:485)
	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:926)
	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:988)
	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:635)
	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:628)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
	at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.ClassNotFoundException: org.apache.poi.ss.usermodel.Workbook
	at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
	at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:430)
	at com.jfinal.server.JFinalClassLoader.loadClass(JFinalClassLoader.java:53)
	... 26 more

2015-11-18 12:45:17
[ERROR]-[Thread: qtp15565667-17]-[com.jfinal.core.JFinalFilter.doFilter()]: /carInfo/carsToExc
java.lang.IllegalStateException: STREAM
	at org.eclipse.jetty.server.Response.getWriter(Response.java:699)
	at com.jfinal.render.ErrorRender.render(ErrorRender.java:59)
	at com.jfinal.core.ActionHandler.handle(ActionHandler.java:126)
	at com.jfinal.core.JFinalFilter.doFilter(JFinalFilter.java:72)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1307)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:453)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:560)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1072)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:382)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1006)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
	at org.eclipse.jetty.server.Server.handle(Server.java:365)
	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:485)
	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:926)
	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:988)
	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:635)
	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:628)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
	at java.lang.Thread.run(Thread.java:744)

而且用官方实例：

      public void columns() {
            String[] columns = new String[] { "ACC_NBR", "DEVID", "IMSI" };
            String[] headers = new String[] { "电话号码", "设备id", "imsi", "最后上线时间" };
            String[] headers2 = new String[] { "电话号码", "设备id", "imsi" };

            List<Object> data = Lists.newArrayList();
            for (int i = 0; i < 5; i++) {
                Map<String, Object> map = getMap(i);
                data.add(map);
            }
            render(PoiRender.me(data).fileName("your_file_name.xls").headers(headers).cellWidth(5000).headerRow(2));
    }


	    private Map<String, Object> getMap(int i) {
	        Map<String, Object> map = Maps.newHashMap();
	        map.put("ACC_NBR", "ACC_NBR" + i);
	        map.put("IMSI", "IMSI" + i);
	        map.put("DEVID", "DEVID" + i);
	        map.put("LASTTIME", "LASTTIME" + i);
	        return map;
	    }