Hi: Looking at ContextBase.java in master branch, in line 65, executorService is instantiated by ThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue)Would it be simple to replace this line 42 and line 45 with ExecutorService executorService = Executors.newSingleThreadExecutor(); I tested above codes successfully with scan_LOGBACK_474( ) in ReconfigureOnChangeTest.java with Jdk 1.7_06 , // CORE_POOL_SIZE must be 1 for JDK 1.5. For JD 1.6 or higher it's set to 0 // so that there are no idle threads private static final int CORE_POOL_SIZE = EnvUtil.isJDK5() ? 1 : 0; // 0 (JDK 1,6+) or 1 (JDK 1.5) idle threads, 2 maximum threads, no idle waiting ExecutorService executorService = new ThreadPoolExecutor(CORE_POOL_SIZE, 2, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>()); Ming Qin Cell Phone Number: 949-388-9898