Double builds

[Michael Johns <mi...@clear2pay.com>]

We're using Continuum 1.1 with Maven 2.0.8 on a Windows 2003 Server box, and we've just started experiencing a very maddening problem.  Every time a build is scheduled to fire, it appears to fire twice.  It always fails the first time with the following error:

org.codehaus.plexus.taskqueue.execution.TaskExecutionException: Error executing action 'update-project-from-working-directory'
        at org.apache.maven.continuum.buildcontroller.DefaultBuildController.performAction(DefaultBuildController.java:434)
        at org.apache.maven.continuum.buildcontroller.DefaultBuildController.build(DefaultBuildController.java:139)
        at org.apache.maven.continuum.buildcontroller.BuildProjectTaskExecutor.executeTask(BuildProjectTaskExecutor.java:50)
        at org.codehaus.plexus.taskqueue.execution.ThreadedTaskQueueExecutor$ExecutorRunnable$1.run(ThreadedTaskQueueExecutor.java:116)
        at edu.emory.mathcs.backport.java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:442)
        at edu.emory.mathcs.backport.java.util.concurrent.FutureTask.run(FutureTask.java:176)
        at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:665)
        at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:690)
        at java.lang.Thread.run(Thread.java:595)
Caused by: org.apache.maven.continuum.execution.ContinuumBuildExecutorException: Error while mapping metadata:add.project.artifact.not.found.error
add.project.unknown.error

        at org.apache.maven.continuum.execution.maven.m2.MavenTwoBuildExecutor.updateProjectFromCheckOut(MavenTwoBuildExecutor.java:157)
        at org.apache.maven.continuum.core.action.UpdateProjectFromWorkingDirectoryContinuumAction.execute(UpdateProjectFromWorkingDirectoryContinuumAction.java:75)
        at org.apache.maven.continuum.buildcontroller.DefaultBuildController.performAction(DefaultBuildController.java:408)
        ... 8 more

The second build proceeds properly, but emails are always triggered due to the change in status from error to success.  Interestingly enough, we don't get mails when that first build fails, which changes the status from success to error.

This happens with every single one of our projects, and it just started happening recently.  We used Continuum 1.1 for a few months with no troubles.  If you look at the build history for a project, every other build is about 12 seconds and ends in failure.  And then another build fires immediately after it and works fine.

I'd like to delete the projects and re-add them, but there's a Continuum bug (CONTINUUM-1630) that prevents me from doing so.  I am 99% positive this has nothing to do with our build schedules, either.  We don't have very many, and they are fairly standard looking.  We certainly don't have any schedule that says "build twice every two hours."

Any insight into this issue or ideas for next steps is greatly appreciated.

Michael