撑杆2中带有选择标签的贴图动作

如何解决撑杆2中带有选择标签的贴图动作

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  <s:select name=\"country\" list=\"countryList\" listKey=\"countryId\" 
     listValue=\"countryName\" headerKey=\"0\" headerValue=\"Country\"
     label=\"Select a country\" />

country.java

    package vaannila;

    public class Country {

      private int countryId;

      private String countryName;

      Country(int countryId,String countryName) {
        this.countryId = countryId;
        this.countryName = countryName;
      }

      public int getCountryId() {
        return countryId;
      }

      public void setCountryId(int countryId) {
        this.countryId = countryId;
      }

      public String getCountryName() {
        return countryName;
      }

      public void setCountryName(String countryName) {
        this.countryName = countryName;
      }
}

HelloWorld.java

public class HelloWorld {

private String message;

private String userName;
private String gender;
private boolean language;
private ArrayList<Country> countryList;

public HelloWorld(){
countryList = new ArrayList<Country>();
    countryList.add(new Country(1,\"India\"));
    countryList.add(new Country(2,\"USA\"));
    countryList.add(new Country(3,\"France\"));

}   

public boolean isLanguage() {
    return language;
}

public void setLanguage(boolean language) {
    this.language = language;
}

public String getGender() {
    return gender;
}

public void setGender(String gender) {
    this.gender = gender;
}

public ArrayList<Country> getCountryList() {
    return countryList;
}

public void setCountryList(ArrayList<Country> countryList) {
    this.countryList = countryList;
}

public String execute()  {
    setMessage(\"Hello \" + getUserName());
    return \"SUCCESS\";
}

public String getMessage() {
    return message;
}

public void setMessage(String message) {
    this.message = message;
}

public String getUserName() {
    return userName;
}

public void setUserName(String userName) {
    this.userName = userName;
}
}

struts.xml

<struts>
  <!-- Configuration for the default package. -->
  <package name=\"default\"  extends=\"struts-default\">
     <action name=\"HelloWorld\" class=\"vaannila.HelloWorld\">
        <result name=\"SUCCESS\">/success.jsp</result>
     </action>
  </package>
</struts>

Http状态500 org.apache.jasper.JasperException：标记\'select \'，字段\'list \'，名称\'country \'：所请求的列表键\'countryList \'无法解析为集合/数组 这是错误的到来。 谁能帮我     

解决方法

        您在

HelloWorld

动作类中缺少

country

实例变量和适当的getter / setter方法...