JSF bean不止一次创建

Question

当我打开jsf页面时，Notice: iconv(): Detected an illegal character in input string in 会创建两次。那为什么会这样呢？ jsf页面：

catalog bean

豆：

<h:dataTable value="#{catalog.products}" var="p">
    <h:column>
        <h:form>
            <h:commandLink action="detail?faces-redirect=true"
                value="#{p.brand} #{p.model}">
                <f:setPropertyActionListener value="#{p}"
                    target="#{ph.currentProduct}" />
            </h:commandLink>
        </h:form>
    </h:column>
</h:dataTable>