log4j stops reporting file and line number when my application ends one thread
of a class, then starts a new thread. Here is the output before and after the
problem. What could cause this loss of file and line number?

=2004-06-21 12:01:19,100 ERROR [Thread-17] probeServer (probeServer.java:873) -
found a zero or negative data size: -24 msgByteCount: 0

=2004-06-21 12:01:19,105 FATAL [Thread-17] probeServer.reader
(probeServer.java:738) - --------------------- probe 172.19.142.77 is being
REMOVED by data length less than one in header class

=2004-06-21 12:01:19,112 INFO [Thread-17] probeServer (probeServer.java:746) -
closed inputStream and socket for probe 172.19.142.77

=2004-06-21 12:01:19,116 INFO [Thread-14] probeServer (probeServer.java:189) -
-- probeServer received connection request

=2004-06-21 12:01:19,117 INFO [Thread-20] probeServer ( ?:?) - --- new probe
thread starting: Socket[addr=/172.19.142.77,port=33576,localport=5000]

=2004-06-21 12:01

Thanks