[线程][修改]:复用已有线程, 打印appId

mlWechatOpen/src/main/java/com/iformall/controller/WechatCalllbackController.java

@@ -283,6 +283,7 @@ public class WechatCalllbackController extends BaseController {
                     return;
             }
         } else {
+            logger.info("unknown event, appId: " + appId);
             getThreadCount( 0 );
             // 公众号
             try {