exception 

org.apache.jasper.JasperException: An exception occurred processing JSP page /register.jsp at line 16

13: </head>
14: <body>
15: <s:form action="saveOrUpdateUser">
16:     <s:push value="user">
17:         <s:hidden name="id" />
18:         <s:textfield name="name" label="User Name" />
19:         <s:radio name="gender" label="Gender" list="{'Male','Female'}" />


Stacktrace:
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:73)


root cause 

tag 'push', field 'value': You must specify a value to push on the stack. Example: person - [unknown location]
    org.apache.struts2.components.Component.fieldError(Component.java:230)
    org.apache.struts2.components.Component.findValue(Component.java:351)
    org.apache.struts2.components.Push.start(Push.java:128)
    org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(ComponentTagSupport.java:53)
    org.apache.jsp.register_jsp._jspx_meth_s_005fpush_005f0(register_jsp.java:209)
    org.apache.jsp.register_jsp._jspx_meth_s_005fform_005f0(register_jsp.java:179)
    org.apache.jsp.register_jsp._jspService(register_jsp.java:120)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

错误页面部分代码：

<s:form action="saveOrUpdateUser">
    <s:push value="user">
        <s:hidden name="id" />
        <s:textfield name="name" label="User Name" />
        <s:radio name="gender" label="Gender" list="{'Male','Female'}" />
        <s:select name="country" list="{'India','USA','UK'}" headerKey=""
            headerValue="Select" label="Select a country" />
        <s:textarea name="aboutYou" label="About You" />
        <s:checkbox name="mailingList"
            label="Would you like to join our mailing list?" />
        <s:submit />
    </s:push>
</s:form>

Action部分的代码：

private User user = new User();
    private List<User> userList = new ArrayList<User>();
    private UserDAO userDAO = new UserDAOImpl();
    
    public void setUser(User user) {
        this.user = user;
    }
    
    public User getUser() {
        return user;
    }

"user" 已声明且已有 set/get 方法

User类：

package com.vaannila.domain;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="USERDEMO")
public class User {

    private Long id;
    private String name;
    private String gender;
    private String country;
    private String aboutYou;
    private Boolean mailingList;
    
    @Id
    @GeneratedValue
    @Column(name="ID")    
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    
    @Column(name="NAME")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    
    @Column(name="GENDER")
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    
    @Column(name="COUNTRY")
    public String getCountry() {
        return country;
    }
    public void setCountry(String country) {
        this.country = country;
    }
    
    @Column(name="ABOUTYOU")
    public String getAboutYou() {
        return aboutYou;
    }
    public void setAboutYou(String aboutYou) {
        this.aboutYou = aboutYou;
    }
    
    @Column(name="MAILINGLIST")
    public Boolean getMailingList() {
        return mailingList;
    }
    public void setMailingList(Boolean mailingList) {
        this.mailingList = mailingList;
    }

}

自己检查好几遍不知道错误出在哪里，请明白人指点。

问题补充：问题已解决！

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