dwr出现session error及Uncaught Error: You must include DWR engine before including this file问题

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dwr3.0后对于js文件库的引用顺序作了要求，必须按照如下顺序才能正确执行，否则浏览器就会报一个名为session error及Uncaught Error: You must include DWR engine before including this file的错

顺序为：

    <%--DWR服务JS--%>
    <script type='text/javascript' src='${pageContext.request.contextPath}/dwr/engine.js'></script>
    <script type="text/javascript" src="${pageContext.request.contextPath}/dwr/util.js"></script>
    <script type='text/javascript' src='${pageContext.request.contextPath}/dwr/interface/dwrController.js'></script>