Why am I getting (Unknown Source) instead of a line number?

In the past couple of weeks, using Tomcat with a Servlet/java bean app, I've started getting exceptions listing such as this:
Exception in: R( /webman + /servlet/CreateJobServlet + null) - java.lang.NullPointerException
at CreateJobServlet.service(Unknown Source)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
at org.apache.tomcat.core.Handler.service(Handler.java:286)
The thing that bothers me is the "(Unknown Source)" bit. I no longer get the line numbers where the error occured on any of my source files, whereas I'm sure I DID get line numbers a few weeks ago. I thought it might have to do with my changing to JDK1.4, but after changing back to 1.3, the problem persists. Why are the line numbers no longer available, and what can I do to fix it? I've always accepted the frustration of getting NullPointerExceptions in JSP pages, but I don't want to be forced to put lots of System.outs in to help me track down the problems in compiled files!!

It could be one of the following:
- you have not specified -g on compile
(means debug info, check IDE or ANT task if you dont
use command line)
- you have specified -O on compile
(means optimize, which could hinder debug infos)
bottom line:
you should have debuginfos on and optimze off during
compile. Most IDEs have debug info default-on during
compile, when using ANT most people forget to define
the debug=on
<javac srcdir="${src}"
destdir="${build}"
classpath="xyz.jar"
debug="on"
/>
Hope this helps

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Why am I getting (Unknown Source) instead of a line number?

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