Struts2 + jquery + json - some problems

Question

I need to download part of the code dynamically using jQuery and Json.

This is my 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> <constant name="struts.enable.DynamicMethodInvocation" value="false" /> <constant name="struts.devMode" value="true" /> <package name="model" extends="struts-default"> <action name="UserManager" class="model.UserManager"> <result>index.jsp</result> </action> </package> <package name="test" extends="json-default"> <action name="giveMeJsonData" class="test.testAction" method="myFunction"> <result type="json"><param name="root">jsonData</param></result> </action> </package> </struts> 

this is my testAction class:

 package test; import com.opensymphony.xwork2.ActionSupport; import java.util.LinkedHashMap; public class testAction extends ActionSupport { private LinkedHashMap<String, String> jsonData; public LinkedHashMap<String, String> getJsonData() { return jsonData; } public void setJsonData(LinkedHashMap<String, String> jsonData) { this.jsonData = jsonData; } @Override public String execute() throws Exception { return SUCCESS; } public String myFunction() { jsonData = new LinkedHashMap<String, String>(); jsonData.put("My name is", "marco"); return SUCCESS; } } 

and I call this method with submit:

 <s:div id="my_result" > <s:property value="jsonData" /> </s:div> <s:form action="giveMeJsonData" theme="simple"> <sj:submit targets="my_result" value="Example" /> </s:form> 

Problems:

1 - Unfortunately, when I try to run the application, the server log (tomcat) says:

 Unable to load configuration Error building results for action UserManager in namespace 

relative to the string <action name="UserManager" class="model.UserManager"> and

 There is no result type defined for type 'json' mapped with name 'success'. Did you mean 'json'? 

regarding <result>index.jsp</result>

2 - When I click the "Example" button, I do not get the Json element.

What am I wrong?

Greetings

UPDATE 1

 <package name="json-default" extends="struts-default"> <result-types> <result-type name="json" class="com.googlecode.jsonplugin.JSONResult"/> </result-types> </package> <package name="test" extends="json-default"> <action name="giveMeJsonData" class="test.testAction" method="myFunction"> <result type="json"><param name="root">jsonData</param></result> </action> </package> 

UPDATE 2

 9-dic-2010 13.49.35 org.apache.catalina.core.StandardContext filterStart GRAVE: Exception starting filter struts2 Unable to load configuration. - action - file:/C:/Users/djfonplaz/Documents/Stage/Struts2/build/web/WEB-INF/classes/struts.xml:11:62 at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:431) at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:69) at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:295) at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422) at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:115) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3838) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4488) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546) at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:637) at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:563) at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:498) at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277) at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053) at org.apache.catalina.core.StandardHost.start(StandardHost.java:785) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443) at org.apache.catalina.core.StandardService.start(StandardService.java:519) at org.apache.catalina.core.StandardServer.start(StandardServer.java:710) at org.apache.catalina.startup.Catalina.start(Catalina.java:581) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414) Caused by: Unable to load configuration. - action - file:/C:/Users/djfonplaz/Documents/Stage/Struts2/build/web/WEB-INF/classes/struts.xml:11:62 at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:58) at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:374) at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:418) ... 29 more Caused by: Error building results for action UserManager in namespace - action - file:/C:/Users/djfonplaz/Documents/Stage/Struts2/build/web/WEB-INF/classes/struts.xml:11:62 at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addAction(XmlConfigurationProvider.java:367) at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:468) at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:264) at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:111) at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:193) at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:55) ... 31 more Caused by: There is no result type defined for type 'json' mapped with name 'success'. Did you mean 'json'? - result - file:/C:/Users/djfonplaz/Documents/Stage/Struts2/build/web/WEB-INF/classes/struts.xml:12:35 at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.buildResults(XmlConfigurationProvider.java:621) at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addAction(XmlConfigurationProvider.java:365) ... 36 more 9-dic-2010 13.50.23 org.apache.catalina.core.StandardContext filterStart GRAVE: Exception starting filter struts2 Unable to load configuration. - action - file:/C:/Users/djfonplaz/Documents/Stage/Struts2/build/web/WEB-INF/classes/struts.xml:11:62 at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:431) at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:69) at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:295) at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422) at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:115) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3838) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4488) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546) at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:637) at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:521) at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1359) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:297) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:836) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:761) at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1500) at org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:849) at org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:351) at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:199) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:558) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579) at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555) at java.lang.Thread.run(Thread.java:619) Caused by: Unable to load configuration. - action - file:/C:/Users/djfonplaz/Documents/Stage/Struts2/build/web/WEB-INF/classes/struts.xml:11:62 at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:58) at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:374) at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:418) ... 41 more 

Answer 1

You seem to have taken this example.

Try with this 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> <constant name="struts.enable.DynamicMethodInvocation" value="false" /> <constant name="struts.devMode" value="true" /> <package name="test" extends="json-default"> <action name="giveMeJsonData" class="test.testAction" method="myFunction"> <result type="json"><param name="root">jsonData</param></result> </action> </package> </struts> 

And you must include the json plugin in /WEB-INF/lib .

I use a different way.

struts.xml:

 <action name="getjson" class="myclass" method="getJson"> <result name="success" type="stream"> <param name="contentType">application/json</param> <param name="inputName">inputStream</param> </result> </action> 

Method:

 public String getJson() { String json = "({ 'var1': 'value1', 'var2': 'value2' })"; inputStream = new ByteArrayInputStream(json.getBytes()); return SUCCESS; } 

Update: I changed struts.xml. The json-default package is defined in the plugin.

Update 2: This setting worked for me.

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> <constant name="struts.enable.DynamicMethodInvocation" value="false" /> <constant name="struts.devMode" value="true" /> <package name="TestJson" extends="json-default"> <action name="giveMeJsonData" class="test.testAction" method="myFunction"> <result type="json"><param name="root">jsonData</param></result> </action> </package> </struts> 

I had a problem with jsonplugin-0.34. Instead, I used struts2-json-plugin-2.1.8.jar . But the error that I had has nothing to do with yours: it is "java.lang.ClassNotFoundException: com.opensymphony.xwork2.util.TextUtils"

If the example button appears in the download window, try this for the jsp page:

 <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <%@ taglib prefix="s" uri="/struts-tags" %> <%@ taglib prefix="sj" uri="/struts-jquery-tags" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <sj:head/> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Json Test</title> </head> <body> <s:div id="my_result" > <s:property value="jsonData" /> </s:div> <sj:a targets="my_result" href="giveMeJsonData">Example</sj:a> </body> </html>