将值绑定到复合组件中的UIInput会导致null

Question

我正在尝试为用户搜索创建复合组件。这是组件xhtml：

<ui:composition xmlns="http://www.w3.org/1999/xhtml"
            xmlns:ui="http://java.sun.com/jsf/facelets"
            xmlns:p="http://primefaces.org/ui"
            xmlns:cc="http://java.sun.com/jsf/composite"
            xmlns:h="http://java.sun.com/jsf/html">

<cc:interface componentType="searchUser">
    <!-- Define component attributes here -->
    <cc:attribute name="value" type="java.lang.Object"
                  shortDescription="Selected User"/>
</cc:interface>

<cc:implementation>
    <p:commandButton onclick="PF('sdgl').show();" type="button" value="search for user"/>
    <p:dialog header="Search for User"
              widgetVar="sdgl"
              modal="true"
              width="80%"
              appendTo="@(body)"
            >
        <h:form id="searchDLGForm" >
            <p:fragment autoUpdate="true">
                <p:panelGrid columns="2" id="searchPanel">
                    <p:outputLabel value="Username: "
                                   for="username"
                            />
                    <p:inputText id="username" binding="#{cc.login}"/>

                    <p:outputLabel value="First Name: "
                                   for="firstname"
                            />
                    <p:inputText id="firstname" binding="#{cc.firstname}"/>

                    <p:outputLabel value="Last Name: "
                                   for="lastname"
                            />
                    <p:inputText id="lastname" binding="#{cc.lastname}"/>

                    <p:commandButton value="search" actionListener="#{cc.search}"/>
                </p:panelGrid>
                <p:dataTable value="#{cc.foundUser}" var="user" id="sdgl_res" selection="#{cc.selectedUser}"
                             rowKey="#{user.id}">
                    <p:column selectionMode="single"
                              style="width:16px;text-align:center"/>
                    <p:column headerText="First Name">
                        #{user.firstName}
                    </p:column>
                    <p:column headerText="Last Name">
                        #{user.lastName}
                    </p:column>
                    <p:column headerText="E-Mail">
                        #{user.email}
                    </p:column>
                </p:dataTable>
            </p:fragment>
        </h:form>
    </p:dialog>
</cc:implementation>

该组成部分是nesten in：

<h:form id="ouMembers">
    <div>
        <p:panelGrid>
            ......
            <my:searchUser id="searchDLG" value="#{ouBean.userToAdd}"/>
        </p:panelGrid>
    </div>
</h:form>

和相应的Java：

private UIInput firstname;
private UIInput lastname;
private UIInput login;
private UserModel selectedUser;
private List<UserModel> foundUser;


 /**
 * Returns the component family of {@link UINamingContainer}.
 * (that's just required by composite component)
 */
@Override
public String getFamily() {
    return UINamingContainer.COMPONENT_FAMILY;
}


/**
 * return selected user
 *
 * @return selected user
 */
@Override
public Object getSubmittedValue() {
    return selectedUser;
}

public void search(ActionEvent event) {
    System.out.println("searchUser called with: " + this.login.getSubmittedValue()+ ", " +
            ""+this.firstname.getSubmittedValue()+"," +
            ""+this.lastname.getSubmittedValue());

    this.foundUser = UserModel.searchUser((String)this.login.getSubmittedValue(),
            (String)this.firstname.getSubmittedValue(),
            (String)this.lastname.getSubmittedValue());
}

@Override
public void encodeBegin(FacesContext context) throws IOException {
    UserModel value = (UserModel) getValue();
    if(value!=null){
        firstname.setValue(value.getFirstName());
        lastname.setValue(value.getLastName());
        login.setValue(value.getLogin());
    }else{
        firstname.setValue("");
        lastname.setValue("");
        login.setValue("");
    }
}

+ getters setters

我目前遇到的问题是this.login.getSubmittedValue()，this.firstname.getSubmittedValue()和this.lastname.getSubmittedValue()在搜索方法中为空。我尝试过使用getValue()，但也导致了空值。

我正在关注http://balusc.omnifaces.org/2013/01/composite-component-with-multiple-input.html教程。任何帮助是极大的赞赏。感谢。

我正在使用： com.sun.faces 2.2.12 主要的5.2 在Glassfish 4.1.0上

修改

从对话框中删除<h:form id="searchDLGForm" >和appendTo="@(body)"后，它就可以了。但是我必须删除modal="true"参数，否则对话框也处于非活动状态。