Better error reporting with Websphere 404/500 error .jsp page

It is always a pain to detect J2EE errors. Here is a code snippet for a 404/500 type JSP error file to give you a better look at generic errors.


    // <%@ page import="com.ibm.websphere.servlet.error.ServletErrorReport,java.io.*" %>
    // <%
    // Place in a 404/500 JSP error page file.
    if (pageContext.getAttribute("ErrorReport", PageContext.REQUEST_SCOPE) != null) {
        // Better error reporting in a J2EE/Websphere application.
        ServletErrorReport errReport = (ServletErrorReport) pageContext.getAttribute("ErrorReport", 
                PageContext.REQUEST_SCOPE);
        
        errReport.printStackTrace();      
        out.println("Error Code: " + errReport.getErrorCode());        
        if (errReport.getRootCause() != null) {
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            if (errReport.getRootCause() instanceof ServletException) {           
                ServletException se = (ServletException) errReport.getRootCause();
                se.printStackTrace();
                if (se.getMessage() != null) {
                    out.println((se.getMessage()));
                } else { 
                    out.println(errReport.getMessage());
                } // End of If
                if (se.getRootCause() != null) {
                    se.getRootCause().printStackTrace(pw);
                } else {
                    se.printStackTrace(pw);
                } // End of If
            } else {
                errReport.getRootCause().printStackTrace(pw);
                out.println(errReport.getMessage());
            }
            pw.flush();
            out.println(sw.toString());
        }
        else {            
            // Populate the StringWriter            
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            StackTraceElement elem [] = errReport.getStackTrace();
            for (int i = 0; i < errReport.getStackTrace().length; i++) {
                out.println("<br />ERR: (rootcause==null) SE: /" 
                    + elem[i].getFileName() + " /" + elem[i].getClassName() + " /" + elem[i].getMethodName());
            }            
            out.println("<br/>ERR: (rootcause==null)|" + errReport.getMessage());
            out.println("<br/>ERR: (rootcause==null)|" + errReport.getStackTrace().toString());
        }
    }   
    // %>

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