Operating environment JDK1.5 Tomcat5.5 JB2005 (It seems that it is 5 uncomfortable) built a web project in JB, if there is no Java code in Index.jsp, run directly in JB or add Tomcat virtual It is running normally in the catalog. But if the simplest piece of code is added in Index.jsp, it will have problems <% out.println ("Hello")%>
Appear the following error HTTP Status 500 - type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException org.apache.jasper.servlet.JspServletWrapper.service (JspServletWrapper. java: 373) org.apache.jasper.servlet.JspServlet.serviceJspFile (JspServlet.java:295) org.apache.jasper.servlet.JspServlet.service (JspServlet.java:245) javax.servlet.http.HttpServlet.service ( HttpServlet.java:802)root cause java.lang.NullPointerException org.apache.jsp.index_jsp._jspService (index_jsp.java:61) org.apache.jasper.runtime.HttpJspBase.service (HttpJspBase.java:99) javax.servlet .http.HttpServlet.service (HttpServlet.java:802) org.apache.jasper.servlet.JspServletWrapper.service (JspServletWrapper.java:325) org.apache.jasper.servlet.JspServlet.serviceJspFile (JspServlet.java:295) org .apache.jasper.servlet.jspservlet.service (jspservlet.java: 245) javax.servlet.http.httpservlet.service (httpservlet.java: 802) Note The Full S Tack trace of the root cause is available in the apache tomcat / 5.5.4 logs.apache tomcat / 5.5.4
