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From David Smith <>
Subject Re: Problem with Tomcat hangs for no obvious reason
Date Thu, 20 Sep 2007 21:27:18 GMT
I'm wondering if the Ajax is consuming the two or so connections your 
browser allows so all other calls to the server get blocked.  If you 
close all your browser windows and re-launch IE, does tomcat start 
responding again?  If so, tomcat isn't hanging -- it's a javascript 
issue with your client.


Mingus, Jennifer (JC) wrote:
> Hi, 
> I have tomcat 5.5.23 installed on Red Hat Enterprise Linux 5 and a simple web application
using JSF/AJAX. The web application only has two pages. In the first page, it has a few dropdown
lists, which get the options from a SQL server database. The last dropdown list is refreshed
when selections on the others changed. There are two buttons: reset and ok. Click reset to
reset all dropdownlist. And when the user click ok, it goes to the next page to confirm the
choices the user made. Then after click on a button on the second page, the code will simply
write a text file to the server. 
> The problem I'm having is that after a few submissions, the last dropdown list won't
refresh. Then no clicks will get a response. And I can even not go to the manager page. Tomcat
just hangs. And there is no error printed out at catalina.out or localhost.log. I've checked
and made sure that all connections to the database is closed. I found on google that if tomcat
is installed on Redhat 9, you need to put export LD_ASSUME_KERNEL=2.4.1 to But
I'm using Red hat Enterprise linux 5. However, I tried it anyway and it didn't work. One thing
I noticed when I start up tomcat is that I always get "The Apache Tomcat Native library which
allows optional performance in production environments was not found on the java.library.path".
Should I install the library? I didn't think it'll cause Tomcat to hang though.
> So, my question is whether this is caused by tomcat installation and configuration on
the environment or it is caused by the JSF implementation. Will some code in JSF cause tomcat
to hang? I would think if it's a bug in the web application, it will just cause the application
not working, not tomcat to be not responsive at all. How can I find out the reason and how
can I fix it? I'm new with JSF also. I inherited these couple pages from somebody else.
> Any suggestions will be greatly appreciated. 
> Thanks, 
> Jennifer 

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