1.问题：
exception javax.servlet.ServletException: rialto/tag/ImportTag (Unsupported major.minor version 49.0)
        org.apache.jasper.servlet.JspServlet.service(JspServlet.java:244)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
java.lang.UnsupportedClassVersionError: rialto/tag/ImportTag (Unsupported major.minor version 49.0)
答案： I think your problem is about JDK version. The demo war is compile with jdk 1.5, recompile it with jdk 1.4...