Eclipse 3.5.2 Does Not Hit Breakpoints when Remote Debugging on Tomcat 6» - scala

Question

This is a local-to-local debug setup, from an Eclipse instance to Tomcat on localhost.
I've tried starting tomcat from both /etc/init.d/tomcat6 start and from /usr/share/tomcat6/bin/catalina.sh jpda start (ie from the startup command and from CATALINA_HOME command), no change in result.
The JAVA_OPTS to Tomcat are
JAVA_OPTS="-Djava.awt.headless=true
-Xmx256m -XX:+UseConcMarkSweepGC -Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,address=8888,server=y,suspend=n"
Eclipse project is a simple Scala Lift (2.8.1/2.3) web project generated from the default Lift Maven archetype (this has worked in debug before, so it's not the archetype's fault).
Eclipse Remote Debugging configuration is default, except port changed to 8888. Source path includes project directory.
Maven is used for build/deploy, so a mvn clean and mvn tomcat:redeploy is done after breakpoints are set.
Remote Debug session is launched, connects to Tomcat as seen in screenshot.
Tomcat does seem to be in debug mode, as evidenced by catalina.out:
16:19:37.865 [http-127.0.0.1-8080-1]
DEBUG comet_trace - AJAX Request:
C8436967E450AD62D37654BBB3B5FCB9
Map(F27626326198LU12KZ -> List(foo), q
-> List(f0), limit -> List(10), timestamp -> List(1306271977857))
16:19:37.866 [http-127.0.0.1-8080-1]
DEBUG comet_trace - AJAX Response:
C8436967E450AD62D37654BBB3B5FCB9
PlainTextResponse(,List(),200)
16:19:37.870 [http-127.0.0.1-8080-1]
INFO net.liftweb.util.TimeHelpers -
Service request (GET)
/bsa2/search/ajax_request returned
200, took 11 Milliseconds
16:19:44.312 [http-127.0.0.1-8080-1] DEBUG
comet_trace - AJAX Request:
C8436967E450AD62D37654BBB3B5FCB9
Map(F27626326198LU12KZ -> List(foo), q
-> List(), limit -> List(10), timestamp -> List(1306271984133))
Web site is accessed with browser on the normal Tomcat URL (eg http://localhost:8080/test/cleanproject).
No breakpoint is ever reached.