增加static关键字

incubator-common/src/main/java/com/incubator/common/game/AbstractService.java

@@ -111,7 +111,7 @@ public abstract class AbstractService implements IService {
 	 * @author johnc
 	 *
 	 */
-	private class ThreadHolder implements Runnable {
+	private static class ThreadHolder implements Runnable {
 
 		private volatile CountDownLatch cd;