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Tomcat Not Displaying Line Numbers on Exceptions

Henry Lowell
Ranch Hand

Joined: May 29, 2006
Posts: 63
I am using Tomcat 5.0.28 and jdk1.4. I am compiling and deploying with Ant 1.6. When I deploy an app to Tomcat and there is an exception in my code I am not getting the line number displayed. I'll get something like:

at Source)

Is there some compiler setting I need to adjust to make these show up? Is it possible to set this with the ant task?


Ulf Dittmer

Joined: Mar 22, 2005
Posts: 42956
For the line number to be printed, the code needs to have been compiled with the debug flag on. If this is code acquired commercially, then that will most likely not be the case (which doesn't hurt much, since you wouldn't have the source anyway). If it is something you have the source for, then you can recompile it using the debug flag (I think it's called -g).
Ray Stojonic
Ranch Hand

Joined: Aug 08, 2003
Posts: 326
I ran into this same problem when I started using Ant to build my webapps.

Yes, you must tell the javac task that you want the 'extra' information:

Currently, I have debug set to true and debuglevel set to lines,source,vars (pretty much wide open).
It is sorta covered in the JavaRanch Style Guide.
subject: Tomcat Not Displaying Line Numbers on Exceptions
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