Tomcat Not Displaying Line Numbers on Exceptions

[Henry Lowell]

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:

java.lang.NullPointerException
at com.app.persistence.jdbc.JdbcUserDAO.manageUser(Unknown 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?

Thanks.

[Ulf Dittmer]

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]

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:

  <target name="compile" depends="init">
 
    <mkdir dir="${javac.build}"/>
 
    <javac srcdir      = "${javac.src}"
           destdir     = "${javac.build}"
           source      = "${javac.source}"
           debug       = "${javac.debug}"
           debuglevel  = "${javac.debuglevel}"
           target      = "${javac.target.version}" >
 
      <classpath refid="project.classpath" />
 
    </javac>
  </target>

Currently, I have debug set to true and debuglevel set to lines,source,vars (pretty much wide open).