Andy C wrote:
> ----- Original Message -----
> From: "Sandy McPherson" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Thursday, April 12, 2001 9:06 AM
> Subject: RE: Fed up to the back teeth with tomcat !!!
>
>
>> IMHO: before you go blaming something in public you should first identify
>> the problem lies actually with the product you are slagging. Perhaps you
>> should change your database to mysql!
>
>
> Yes, I would like to apologise for that. Please understand last night I was
> extremly irratable and unreasonable after a day of frustration.
I know the feeling...
Here's a concrete suggestion to improve your debugging....
Your users are probably seeing the stack trace you yourself want to see,
so set up an error page which writes any exceptions to a log file and
possibly mails the exceptions thrown in the production system to you. In
each servlet you should do a catch( Throwable ex ) around the servlet
body and report the exception before re-throwing the it.
I have attached a tag class which you can hack about to acheive the
desired effect. I have hacked out most of the stuff specific to my
environment, so it may not work "out of the box". I guess you can figure
out what should go in the TLD.
The mail is probably a luxury, but it will wake up your operators!
/*
** $Log: MailException.java,v $
** Revision 1.2 2001/02/23 17:20:37 sandy
** Tidy up exception handling
**
** Revision 1.1 2001/02/15 15:17:02 sandy
** Make error page mail exceptions to admin.
**
*/
package com.mapquest.environment;
import java.lang.*;
import java.io.*;
import java.sql.SQLException;
import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
/**
** Class to mail an exception to the admninistrator
** <p>
** This is a tag which should be used from a JSP error page
** </p>
*/
public class MailException extends TagSupport
{
/**
** Constructs a mailable exception
** <p>
** </p>
** @exception The exception whose details should be mailed
*/
public int doStartTag( )
throws JspTagException
{
try
{
ServletContext application = pageContext.getServletContext( );
Throwable exception = (Throwable)pageContext.getAttribute(
"exception" );
StringWriter trace = new StringWriter( );
PrintWriter traceWriter = new PrintWriter ( trace );
exception.printStackTrace( traceWriter );
JspWriter out = pageContext.getOut( );
System.out.println( trace.toString( ) );
try
{
SQLException dbex = (SQLException)exception;
System.out.println( "SQL ANSI 92 State = "+dbex.getSQLState( )
);
System.out.println( "SQL Error Code = "+dbex.getErrorCode( ) );
}
catch( java.lang.ClassCastException ex )
{
}
try
{
//
// see if this is a servlet exception
//
Throwable rootcause =
((ServletException)exception).getRootCause( );
if ( rootcause != null )
{
StringWriter roottrace = new StringWriter( );
PrintWriter roottraceWriter = new PrintWriter ( roottrace );
rootcause.printStackTrace( roottraceWriter );
System.out.println( "Root Cause:" );
System.out.println( roottrace.toString( ) );
SQLException dbex = SQLException)rootcause;
System.out.println( "SQL ANSI 92 State =
"+dbex.getSQLState( ) );
System.out.println( "SQL Error Code = "+dbex.getErrorCode(
) );
}
}
catch( java.lang.ClassCastException ex )
{
}
//
// mail the message
//
String smtphost = application.getInitParameter(
"MAIL.SMTP.HOST" );
if ( smtphost == null )
{
throw new JspTagException( "MAIL.SMTP.HOST not set");
}
String to = application.getInitParameter("MAIL.ADMIN.EMAIL");
if ( to == null )
{
throw new JspTagException( "MAIL.ADMIN.EMAIL not set");
}
//
// set up the message
//
StringWriter message = new StringWriter( );
PrintWriter messagewriter = new PrintWriter( message );
messagewriter.println( "An exception occurred at "
+ new
java.util.Date( ).toString( ) );
messagewriter.println( trace.toString( ) );
//
// set up the email server
//
Properties props = System.getProperties( );
props.put("mail.smtp.host", smtphost );
Session mailsession = Session.getInstance( props, null );
mailsession.setDebug( false );
//
// fill in the message
//
try
{
MimeMessage email = new MimeMessage( mailsession );
email.setFrom( new InternetAddress( to ) );
email.setSubject( "Exception Caught" );
email.addRecipient(Message.RecipientType.TO, new
InternetAddress(to));
email.setText( message.toString( ) );
//
// send message
//
Transport.send( email );
}
catch ( MessagingException ex )
{
System.out.println( ex.toString( ) );
}
}
catch ( IOException ex )
{
System.out.println( ex.toString( ) );
}
return SKIP_BODY;
}
}
