之前写的几个action都可以正常运行，validateLastName和delete都是返回ajax-success，但是delete方法可以正常运行，validateLastName就提示找不到action。

错误显示:
ERROR Dispatcher Could not find action or result: /Ssh-1/emp-validateLastName
There is no Action mapped for namespace [/] and action name [emp-validateLastName] associated with context path [/Ssh-1]. - [unknown location]

struts.xml:
<action name="emp-*" class="employeeAction" method="{1}">
<result name="list">/WEB-INF/views/emp-list.jsp</result>
<result type="stream" name="ajax-success">
<param name="contentType">text/html</param>
<param name="inputName">inputStream</param>
</result>
<result name="input">/WEB-INF/views/emp-input.jsp</result>
<result name="success" type="redirect">/emp-list</result>
</action>

action:
public String validateLastName() {
if (employeeService.validateLastName(lastName)) {
try {
inputStream = new ByteArrayInputStream("1".getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
} else {
try {
inputStream = new ByteArrayInputStream("0".getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}

    return "ajax-success";

}

调用：var url = "emp-validateLastName";
var args = {
"lastName" : val,
"time" : new Date()
};
$.post(url, args, function(data)