jsp 调用webservice 怎么出问题？？？

[cauczqy0905]

我用java 编的一个webservice 部署在tomcat 的axis里，通过java程序调用成功了，可是用jsp调用却总抛异常：

org.apache.jasper.JasperException: org/apache/commons/discovery/tools/DiscoverSingleton
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:254)
。。。。。。。

root cause

javax.servlet.ServletException: org/apache/commons/discovery/tools/DiscoverSingleton
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:536)
at org.apache.jsp.result_stationcontent_jsp._jspService(result_stationcontent_jsp.java:300)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)

由jsp转换成的servlet result_stationcontent_jsp.java出错部分为：

catch (Throwable t) {
out = _jspx_out;
if (out != null && out.getBufferSize() != 0)
out.clearBuffer();
if (pageContext != null) pageContext.handlePageException(t);<－300行
} finally {
if (_jspxFactory != null) _jspxFactory.releasePageContext(pageContext);
}

请各位帮忙，谢了！