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Old 05-29-2002, 02:30 PM   #1
Ethan
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system.out.println() not working in servlet, Tomcat


Trying to insert a print statement into a servlet to print to standard output. Servlet is running within Tomcat 4.0.1 and I've verified that it is loading and running.

I'm using KDE on RH 7.2 on a Thinkpad T22. I open a console window and would like to see the output there.

In the past this procedure worked fine under Tomcat 3.1.

system.out.println() is supposed to send data to standard output. Is there some other way to view standard output?

Thanks,

Ethan
 
Old 05-29-2002, 02:46 PM   #2
orgcandman
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System.out.println() should print to the console just fine, but I suggest investing in a better outputting system. Check out apache's log4j. it totally rocks, I use it here at work. I've never had problems with tomcat not pushing data out...could you put up a small sample of the code that's not printing out (and do you know that execution is reaching that code?)
 
Old 05-29-2002, 07:47 PM   #3
Ethan
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I took a look at the log4j site. Looks extremely cool. I'll try to experiment with it when I have a chance.

Someone on another forum said that in Tomcat 4.0.1, the standard output goes to the file logs/catalina.out. And indeed, I found the output from my print statements there. I'm not sure why they set it up that way. I guess servlets operate in their own isolated universe within Tomcat.

Maybe there's a way to change that behavior. I found no reference to "output" or "catalina.out" in conf/server.xml.

Thanks,

Ethan
 
Old 05-30-2002, 11:02 AM   #4
jISV
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I'm using 4.0.1 and my printlines go to stdout - not to Catalina.out

I've changed nothing at all from the default zip extraction - this is on winblows mind you. Still, I can't see it would be different on linux.
 
Old 06-03-2002, 09:35 AM   #5
Yarrick
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out.println() prints to the webpage, System.out.println() prints to the log.
 
Old 07-23-2002, 05:40 PM   #6
uuutino
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Is there anyway to see System.out.println() messages in some kind of window that keeps on getting updates instead of having to open the log file everytime to see updates?

Thanks
 
Old 07-24-2002, 08:24 AM   #7
orgcandman
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if you're running on a *nix machine, run less or tail -f on the log file. If you're on a Micros**t machine, download cygwin and use less or tail -f

Aaron
 
Old 07-24-2002, 11:40 AM   #8
uuutino
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Cool! Thanks for the prompt response. However, is there a way to direct the message to the screen (and not a log file) and have it update automatically? (therefore it doens't take up space on the hd and i won't need to type anything to see the latest information)

thanks!
 
  


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