[JIRA] [maven] (JENKINS-22486) API change in maven 3.2.1 causes builds with the parallel (-T option) to fail with an exception.

Mon, 04 Aug 2014 06:19:41 -0700

I have a working workaround. If you create a MavenLifecycleParticipant (see http://maven.apache.org/examples/maven-3-lifecycle-extensions.html), it is possible to change the number of threads based on an environment entry:

@Component(role = AbstractMavenLifecycleParticipant.class, hint = "threadNumber")
public class ThreadNumberSetterMavenExtension extends AbstractMavenLifecycleParticipant {
...
    public void afterProjectsRead(MavenSession session) throws MavenExecutionException {
    	int numberOfThreads = 1;
    	String threadNumberPerCoreString = System.getProperty( ENVIRONMENT_ENTRY_FOR_THREAD_NUMBER );
    	if ( threadNumberPerCoreString != null ) {    		
    		try {
    			double threadsPerCoreString = Double.parseDouble( threadNumberPerCoreString );
				numberOfThreads = (int) (threadsPerCoreString * Runtime.getRuntime().availableProcessors());
    		}
    		catch( NumberFormatException e ) {
    			logger.warn( "Invalid number defined as '" + ENVIRONMENT_ENTRY_FOR_THREAD_NUMBER + "' environment entry. Using 1 thread as default.", e );
    		}
    	}
    	logger.info( "Number of build threads: " + numberOfThreads );
    	if ( numberOfThreads > 1 ) {
    		session.getRequest().setBuilderId( "multithreaded" );    		
    	}
    	else {
    		session.getRequest().setBuilderId( "singlethreaded" );
    	}
    	session.getRequest().setDegreeOfConcurrency( numberOfThreads );
	}
...

}
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