我是用tomcat+SQL server2000做的，调试的时候老是出现这样的错误，而且改了两天结果一点没变，请哪位高手帮忙指教指教


HTTP Status 500 - 

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type Exception report

message 

description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

org.apache.jasper.JasperException: java.lang.NullPointerException
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:532)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:426)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)


root cause 

java.lang.NullPointerException
    javabean.SqlOperation.CreateStatement(SqlOperation.java:28)
    javabean.SqlOperation.<init>(SqlOperation.java:19)
    javabean.RecommendProduct.<init>(RecommendProduct.java:11)
    org.apache.jsp.main_jsp._jspService(main_jsp.java:97)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:384)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)


note The full stack trace of the root cause is available in the Apache Tomcat/6.0.10 logs.


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Apache Tomcat/6.0.10