Struts2标签诡异问题

在测试struts2标签的时候遇到了一个问题，怎么想也想不明白

index.jsp

    <s:url var="aurl" namespace="/" action="aurl">
        <s:param name="number" value="zhaoyp" />
        <s:param name="password" value="123"/>
        <s:param name="age" value="11"/>
    </s:url>
    url:<s:property value="%{aurl}" />
    <s:a href="%{aurl}">s:a和s:url使用</s:a>

action:

public class AurlAction extends ActionSupport implements SessionAware {

	private static final long serialVersionUID = -795351427940115962L;

	private String number;
	
	private String password;
	
	private Integer age;
	
	private Map<String, Object> sessionMap;


	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public String execute() throws Exception {
		System.out.println("number = " + number + " , password = " + password + ", age = " + age);
		sessionMap.put("number", number);
		sessionMap.put("password", password);
		sessionMap.put("age", age);
		return SUCCESS;
	}

	public void setSession(Map<String, Object> map) {
		Set<Map.Entry<String, Object>> set = map.entrySet();
		for (Iterator iterator = set.iterator(); iterator.hasNext();) {
			Entry<String, Object> entry = (Entry<String, Object>) iterator
					.next();
			System.out.println("key = " + entry.getKey() + " , value = " + entry.getValue());
			
		}
		sessionMap = map;
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}

	public Map<String, Object> getSessionMap() {
		return sessionMap;
	}

	public void setSessionMap(Map<String, Object> sessionMap) {
		this.sessionMap = sessionMap;
	}

	public String getNumber() {
		return number;
	}

	public void setNumber(String number) {
		this.number = number;
	}

}

Struts.xml

        <action name="aurl" class="com.tag.action.AurlAction">
            <result name="success">aurl.jsp</result>
        </action>

输出页面：

<body>
    <s:debug />
    用户名:<s:property value="%{number}"/> <br>
   密码: <s:property value="%{password}"/><br>
   age:<s:property value="%{age}" /><br>
   session:<s:property value="%{sessionMap}"/>
</body>

我用的struts2.2.1，怎么都无法取到number的值，但是password和age就ok，sessionMap中也只有password和age，没有number

Struts2标签诡异问题

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