Since we upgraded to Hudson 1.347 and the Mercurial plugin 1.25 the SCM polling stops working once a day and we have to restart Tomcat. These are the symptoms:

• The "Last Mercurial Polling Log" of any job shows an empty output, without any "hg incoming" command as usual:

  Last Mercurial Polling Log
  
  Started on Feb 25, 2010 6:21:24 AM
  

• The Tomcat catalina.out log shows the following error all the time:

  Feb 25, 2010 7:57:24 AM hudson.triggers.SCMTrigger$Runner runPolling
  SEVERE: Failed to record SCM polling
  java.lang.AbstractMethodError
  	at hudson.scm.SCM.poll(SCM.java:344)
  	at hudson.model.AbstractProject.poll(AbstractProject.java:1137)
  	at hudson.triggers.SCMTrigger$Runner.runPolling(SCMTrigger.java:319)
  	at hudson.triggers.SCMTrigger$Runner.run(SCMTrigger.java:346)
  	at hudson.util.SequentialExecutionQueue$QueueEntry.run(SequentialExecutionQueue.java:118)
  	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
  	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
  	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
  	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
  	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
  	at java.lang.Thread.run(Thread.java:619)
  

Thanks.