This is a great forum with a searchengine. If you use that, you will find a lot of references. Many of them have the question in it to post the relevant parts of te log file, since this 'screen dump' does not say much.
sorry, I have checked the tomcat.log and can not find any error message. And I can see the data I inputed insert into the MySQL DB.
The console(dos window) showed the same error message with the content in IE.
What should I do to collect more information to verify the error?
Thanks a lot!
what you should do is make sure the logging of your appserser and/or log4j logging have more in them. There should be a detailed stacktrace. If not, it is impossible to find the cause.