package com.oreilly.forum.servlet;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* Shows an error page. Since errors are frequently caused by improperly
* configured JAR files, XML And XSLT are not used by this class.
* If XML and XSLT were used, then the same CLASSPATH issue that caused
* the original exception to occur would probably cause this page
* to fail as well.
*/
public class ErrorRenderer extends Renderer {
private String message;
private Throwable throwable;
public ErrorRenderer(Throwable throwable) {
this(throwable, throwable.getMessage());
}
public ErrorRenderer(String message) {
this(null, message);
}
public ErrorRenderer(Throwable throwable, String message) {
this.throwable = throwable;
this.message = message;
}
public void render(HttpServlet servlet, HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
// just show a simple error page for now.
pw.println("<html>");
pw.println("<body>");
pw.println("<p>");
pw.println(this.message);
pw.println("</p>");
if (this.throwable != null) {
pw.println("<pre>");
this.throwable.printStackTrace(pw);
pw.println("</pre>");
}
pw.println("</body></html>");
}
}
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