elements in a form cannot be assigned to Action properties.

in action1,a property named user is used to do something,then the control is dispatched to page2,here,every element of user is re-assigned and submitted to action2.In action2,there is also a property named user,with the same type.and the related code piece comes here:
private User     user;
    public User getUser() {
        return user;
    }
    public void setUser(User user) {
        this.user = user;
    }
public String newuser() throws Exception{
        if(user == null)    return INPUT;  // input is page2
...
The 1st time I access action2,user is null,and page2 is  shown:
<ww:action id="AllBranches" executeResult="false" name="baseinfo" namespace="/pub"/>
<ww:form action="newuser" namespace="/pub">
	<ww:token/>
	<ww:textfield label="ID" name="user.userid" required="true"/>
	<ww:textfield label="name" name="user.username" required="true"/>
	<ww:password label="pass" name="user.password" required="true"/>
    <ww:select label="branch" name="user.blbranch" list="#attr.AllBranches.branches" listKey="branch" listValue="branch" required="true"/>    
    <ww:submit value="bew user"/>
</ww:form>
But after I filled every elements and submit this form,property"user" is not null,but its every field is null.No form element is assigned to this property.Why???
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