Struts 2 JSON double select

[Armando Da Costa Microsse]

Hi ppl..

I'm trying to run an example I took from the net using JSON. I am using Netbeans 6.9

I followed all the steps of the example, I put all plugin lib folder and everything, but when I run I catch this error:

SEVERE: Exception starting filter struts2
Unable to load configuration. - [unknown location]
        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.Http11Processor.process(Http11Processor.java:852)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
        at java.lang.Thread.run(Thread.java:619)
Caused by: Unable to load configuration. - [unknown location]
        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
Caused by: The Result type [json] which is defined in the Result annotation on the class [class struts2.actions.JsonSample] or determined by the file extension or is the default result type for the PackageConfig of the action, could not be found as a result-type defined for the Struts/XWork package [struts2.actions#convention-default#] - [unknown location]
        at org.apache.struts2.convention.DefaultResultMapBuilder.createResultConfig(DefaultResultMapBuilder.java:422)
        at org.apache.struts2.convention.DefaultResultMapBuilder.createFromAnnotations(DefaultResultMapBuilder.java:394)
        at org.apache.struts2.convention.DefaultResultMapBuilder.build(DefaultResultMapBuilder.java:202)
        at org.apache.struts2.convention.PackageBasedActionConfigBuilder.createActionConfig(PackageBasedActionConfigBuilder.java:800)
        at org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildConfiguration(PackageBasedActionConfigBuilder.java:586)
        at org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildActionConfigs(PackageBasedActionConfigBuilder.java:318)
        at org.apache.struts2.convention.ClasspathPackageProvider.loadPackages(ClasspathPackageProvider.java:53)
        at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:204)
        at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:55)
        ... 43 more

Classe JsonSample.java

//imports
public class JsonSample extends ActionSupport{
    private List<ListValue> languageObjList;
    private List<String>        reloadList;
    private String              language;


   
    @Override
     @Actions(value = {
        @Action(value = "/jsonsample", results = {
            @Result(name = "success", type = "json")})})
    public String execute() throws Exception {

      languageObjList = new ArrayList<ListValue>();
    
      languageObjList.add(new ListValue("J", "Java"));
      languageObjList.add(new ListValue("P", "PHP"));
      languageObjList.add(new ListValue("C", "C#"));

    reloadList = new ArrayList<String>();
    if (language != null && language.equalsIgnoreCase("J"))
    {
      reloadList.add("Struts2");
      reloadList.add("MyFaces");
      reloadList.add("Tapestry");
    }
    else if (language != null && language.equalsIgnoreCase("P"))
    {
      reloadList.add("CakePHP");
      reloadList.add("Symfony");
      reloadList.add("Zend");
    }
    else if (language != null && language.equalsIgnoreCase("C"))
    {
      reloadList.add("NStruts");
      reloadList.add("ProMesh.NET");
      reloadList.add("Websharp");
    }

      return "success";
    }
//getters e setters

index.jsp

<%@taglib prefix="s" uri="/struts-tags"%>
<%@taglib prefix="sj" uri="/struts-jquery-tags" %>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
       <s:form id="formSelectReload" theme="simple" cssClass="yform">
    <fieldset>
        <legend>AJAX Form</legend>
        <div class="type-text">
            <label for="language">Language: </label>
                        <s:url id="remoteurl" action="/jsonsample"/>
                        <sj:select
                                href="%{remoteurl}"
                                id="language"
                                onChangeTopics="reloadsecondlist"
                                name="language"
                                list=" languageObjList"
                                listKey="myKey"
                                listValue="myValue"
                                emptyOption="false"
                                headerKey="-1"
                                headerValue="Please Select a Language"/>
        </div>
        <div class="type-text">
            <label for="echo">Framework: </label>
                        <sj:select
                                href="%{remoteurl}"
                                id="selectWithReloadTopic"
                                formIds="formSelectReload"
                                reloadTopics="reloadsecondlist"
                                name="echo"
                                list="reloadList"
                                emptyOption="false"
                                headerKey="-1"
                                headerValue="Please Select a Framework"/>
        </div>
        <div class="type-button">
                        <sj:submit
                                targets="result"
                                value="AJAX Submit"
                                indicator="indicator"/>
                        <img id="indicator" src="images/loading.gif" alt="Loading..." style="display:none"/>
        </div>
    </fieldset>
</s:form>
    </body>
</html>

Struts.xml
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <!-- Configuration for the default package. --> <package name="default" extends="struts-default,json-default" namespace="/"> </package> </struts>

Any help...

[Amos Matt]

Any help on this issue please?

[Joe Ess]

Are you getting the exact error message as above? Does your code look exactly like Armondo's? Since he posted this three years ago he probably isn't coming back to help and I don't want to spend my time debugging his problem if your problem is different.
As for Armondo's situation, the error states that the return type "json" is unknown:

Caused by: The Result type [json] which is defined in the Result annotation on the class [class struts2.actions.JsonSample] or determined by the file extension or is the default result type for the PackageConfig of the action, could not be found as a result-type defined for the Struts/XWork package [struts2.actions#convention-default#]

His configuration is wrong somewhere. What does your code look like?