避免javax.servlet.servletexception

我在执行以下代码时收到javax.servlet.servletException….

“<%@taglib uri=”http://java.sun.com/jsf/core“prefix=”f“%>”

“<%@taglib uri=”http://java.sun.com/jsf/html“prefix=”h“%>”

“<%@taglib uri=”http://jakarta.apache.org/tiles“prefix=”tiles“%>”

tiles:importattribute scope=“请求”/>

h:panelgrid columns=“2”>

<f:facet name="header">
    <f:subview id="header">
        <tiles:insert attribute="header" flush="false" />
    </f:subview>
</f:facet>

<f:subview id="menu">
    <tiles:insert attribute="menu" flush="false" />
</f:subview>

<f:subview id="content">
    <tiles:insert attribute="content" flush="false" />
</f:subview>