Hello,
I get an error while trying to run the example app that is on the this
site http://cwiki.apache.org/S2PLUGINS/json-plugin.html
After following the instructions i got this files:
////Welcome.jsp
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>Welcome</title>
</head>
<body>
<s:url id="smdUrl" namespace="/nodecorate" action="SMDAction" />
<script type="text/javascript">
//load dojo RPC
dojo.require("dojo.rpc.*");
//create service object(proxy) using SMD (generated by the json result)
var service = new dojo.rpc.JsonService("${smdUrl}");
//function called when remote method returns
var callback = function(bean) {
alert("Price for " + bean.name + " is " + bean.price);
};
//parameter
var bean = {name: "Mocca"};
//execute remote method
var defered = service.doSomething(bean, 5);
//attach callback to defered object
defered.addCallback(callback);
</script>
</body>
</html>
////SMDAction.java
package smd;
import com.googlecode.jsonplugin.annotations.SMDMethod;
import com.opensymphony.xwork2.Action;
public class SMDAction {
public String smd() {
return Action.SUCCESS;
}
@SMDMethod
public Bean doSomething(Bean bean, int quantity) {
bean.setPrice(quantity * 10);
return bean;
}
}
////struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts
Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd";>
<struts>
<package name="RPC" namespace="/nodecorate" extends="json-default">
<action name="SMDAction" class="smd.SMDAction" method="smd">
<interceptor-ref name="json">
<param name="enableSMD">true</param>
</interceptor-ref>
<result type="json">
<param name="enableSMD">true</param>
</result>
</action>
</package>
</struts>
////Bean.java
package smd;
public class Bean {
private String type;
private int price;
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
}
////ERROR:
The error i get is this one:
org.apache.jasper.JasperException: Exception in JSP: /Welcome.jsp:8
5: </head>
6: <body>
7:
8: <s:url id="smdUrl" namespace="/nodecorate" action="SMDAction" />
9: <script type="text/javascript">
10: //load dojo RPC
11: dojo.require("dojo.rpc.*");
And the root cause:
java.lang.NullPointerException
org.apache.struts2.views.jsp.TagUtils.getStack(TagUtils.java:58)
org.apache.struts2.views.jsp.StrutsBodyTagSupport.getStack(StrutsBodyTagSupport.java:52)
org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(ComponentTagSupport.java:49)
org.apache.jsp.Welcome_jsp._jspx_meth_s_url_0(Welcome_jsp.java:112)
org.apache.jsp.Welcome_jsp._jspService(Welcome_jsp.java:59)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
if someone could help me i would greatly apreciate it. I think i have
all the libs i need on the /lib folder... seems like there is a
something missing on the url tag or something...
Thanks and sorry for the big mail.
-kobeto
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