Fixed this accordingly to JBAS-1792: package org.jboss.resource.adapter.quartz.inflow; import org.quartz.SchedulerConfigException; import javax.resource.spi.work.Work; import javax.resource.spi.work.WorkException; import javax.resource.spi.work.WorkManager; /** * Thread pool used to fire Quartz Jobs. * <p/> * Using BootstrapContext's workManager thread pool. * No dependency outside this rar or JCA. * * @see http://jira.jboss.com/jira/browse/JBAS-1792 * @see quartz.properties * * @author <a href="mailto:ales.justin@gmail.com" <ales.justin(a)gmail.com&gt;&gt;Ales Justin</a> */ public class JBossQuartzThreadPool implements org.quartz.spi.ThreadPool { private int poolSize = Integer.MAX_VALUE; private WorkManager workManager; public void initialize() throws SchedulerConfigException { workManager = QuartzResourceAdapter.getConfigTimeWorkManager(); } /** * Currently this method is only used in metadata lookup. * Which is has no further use. * How to provide better estimate? */ public int getPoolSize() { return poolSize; } public boolean runInThread(Runnable runnable) { try { WorkWrapper workWrapper = new WorkWrapper(runnable); workManager.doWork(workWrapper); return true; } catch (WorkException e) { return false; } } /** * No shutdown impl - workManager is shutdown by itself. */ public void shutdown(boolean waitForJobsToComplete) { } /** * Just in case we want to set pool size. */ public void setPoolSize(int poolSize) { this.poolSize = poolSize; } private class WorkWrapper implements Work { private Runnable delegate; public WorkWrapper(Runnable delegate) { this.delegate = delegate; } public void run() { delegate.run(); } public void release() { } } } Better?