Запрашиваемый список ключ 'лицензия' не может быть решена

Question

LicenseCheckBoxAction.java:

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

import com.opensymphony.xwork2.ActionSupport; 

public class LicenseCheckBoxAction extends ActionSupport{ 


    private List<String> license; 

    private String yourLicense; 

    public String LicenseCheckBoxAction() { 

     license = new ArrayList<String>(); 
     license.add("red"); 
     license.add("yellow"); 
     license.add("blue"); 
     license.add("green"); 
     return NONE; 


    } 

    public String execute() { 
     return SUCCESS; 
    } 

    public List<String> getLicense() { 
     return license; 
    } 

    public void setLicense(List<String> license) { 
     this.license = license; 
    } 

    public String getYourLicense() { 
     return yourLicense; 
    } 

    public void setYourLicense(String yourLicense) { 
     this.yourLicense = yourLicense; 
    } 

    public String[] getDefaultLicense() { 
     return new String[] { "red", "green" }; 
    } 

    public void setYourColor(String yourLicense) { 
     this.yourLicense = yourLicense; 
     System.out.println(yourLicense); 
    } 

    public String display() { 

     license = new ArrayList<String>(); 
     license.add("red"); 
     license.add("yellow"); 
     license.add("blue"); 
     license.add("green"); 
     return NONE; 
    } 

    } 

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.devMode" value="true" /> 
<package name="myPack" extends="struts-default"> 

<action name="eventInsertAction" class="com.ca.actions.EventInsertAction"> 
     <result name="success">Success.jsp</result> 
     <result name="error">Error.jsp</result> 
    </action> 
<action name="checkboxListing" class="com.ca.actions.LicenseCheckBoxAction" 
     method="LicenseCheckBoxAction"> 
     <result name="none">create_event.jsp</result> 
    </action> 
<action name="LicenseCheckBoxAction"      
class="com.ca.actions.LicenseCheckBoxAction"> 
<result name="success">Success.jsp</result> 
    </action> 

</package> 
</struts> 

web.xml

<?xml version="1.0" encoding="UTF-8"?> 
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" 
id="WebApp_ID" version="3.1"> 
<display-name>staff_struts</display-name> 
<filter-mapping> 
    <filter-name>struts2</filter-name> 
    <url-pattern>/*</url-pattern> 
</filter-mapping> 
<filter> 
    <filter-name>struts2</filter-name> 
<filter-class> 
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter     
</filter> 
<welcome-file-list> 
    <welcome-file>index.jsp</welcome-file> 
</welcome-file-list> 
</web-app> 

create_event.jsp Выпуск Лицензии

Исключение

HTTP Status 500 - tag 'checkboxlist', field 'list', name 'yourLicense': The 

requested list key 'license' could not be resolved as a 

collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location] 

type Exception report 

message tag 'checkboxlist', field 'list', name 'yourLicense': The requested list key 'license' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location] 

description The server encountered an internal error that prevented it from fulfilling this request. 

exception 

org.apache.jasper.JasperException: tag 'checkboxlist', field 'list', name 'yourLicense': The requested list key 'license' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location] 
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:591) 
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476) 
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396) 
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:96) 
root cause 

tag 'checkboxlist', field 'list', name 'yourLicense': The requested list key 'license' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location] 
    org.apache.struts2.components.Component.fieldError(Component.java:257) 
    org.apache.struts2.components.Component.findValue(Component.java:350) 
    org.apache.struts2.components.ListUIBean.evaluateExtraParams(ListUIBean.java:82) 
    org.apache.struts2.components.CheckboxList.evaluateExtraParams(CheckboxList.java:67) 
    org.apache.struts2.components.UIBean.evaluateParams(UIBean.java:893) 
    org.apache.struts2.components.UIBean.end(UIBean.java:535) 
    org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:42) 
    org.apache.jsp.create_005fevent_jsp._jspx_meth_s_005fcheckboxlist_005f0(create_005fevent_jsp.java:734) 
    org.apache.jsp.create_005fevent_jsp._jspx_meth_s_005fform_005f1(create_005fevent_jsp.java:693) 
    org.apache.jsp.create_005fevent_jsp._jspService(create_005fevent_jsp.java:247) 
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438) 
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396) 
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:96) 
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.33 logs. 

Apache Tomcat/8.0.33 

Когда я пытаюсь позвонить в JSP с помощью ссылки http://localhost:9999/ChaitanyaArtsViews/create_event.jsp я получаю вышеуказанное исключение, но когда я попробуйте вызвать действие, используя http://localhost:9999/ChaitanyaArtsViews/checkboxListing.action, отображается JSP. Как я могу вызвать JSP напрямую без имени действия, поскольку JSP связан с другим, и, следовательно, его следует вызывать вместо действия?

Answer 1

Не вызывайте JSP напрямую! Используйте метод действия, чтобы вернуть результат типа диспетчера, который указывает местоположение JSP.

Добавить код web.xml, чтобы больше не использовать ссылки.

<!-- Restricts access to pure JSP files - access available only via Struts action --> 
    <security-constraint> 
    <display-name>No direct JSP access</display-name> 
    <web-resource-collection> 
     <web-resource-name>No-JSP</web-resource-name> 
     <url-pattern>*.jsp</url-pattern> 
    </web-resource-collection> 
    <auth-constraint> 
     <role-name>no-users</role-name> 
    </auth-constraint> 
    </security-constraint> 

    <security-role> 
    <description>Don't assign users to this role</description> 
    <role-name>no-users</role-name> 
    </security-role>