diff --git a/src/org/redkale/boot/Application.java b/src/org/redkale/boot/Application.java
index 21ef1e564..1a3dd8af0 100644
--- a/src/org/redkale/boot/Application.java
+++ b/src/org/redkale/boot/Application.java
@@ -680,21 +680,21 @@ public final class Application {
         runServers(timecd, watchs); //必须在所有服务都启动后再启动WATCH服务
         timecd.await();
         //if (!singletonrun) signalHandle();
-        if (!singletonrun) clearPersistData();
+        //if (!singletonrun) clearPersistData();
         logger.info(this.getClass().getSimpleName() + " started in " + (System.currentTimeMillis() - startTime) + " ms\r\n");
         if (!singletonrun) this.serversLatch.await();
     }
 
-    private void clearPersistData() {
-        File cachedir = new File(home, "cache");
-        if (!cachedir.isDirectory()) return;
-        File[] lfs = cachedir.listFiles();
-        if (lfs != null) {
-            for (File file : lfs) {
-                if (file.getName().startsWith("persist-")) file.delete();
-            }
-        }
-    }
+//    private void clearPersistData() {
+//        File cachedir = new File(home, "cache");
+//        if (!cachedir.isDirectory()) return;
+//        File[] lfs = cachedir.listFiles();
+//        if (lfs != null) {
+//            for (File file : lfs) {
+//                if (file.getName().startsWith("persist-")) file.delete();
+//            }
+//        }
+//    }
 
 //    private void signalHandle() {
 //        //http://www.comptechdoc.org/os/linux/programming/linux_pgsignals.html
diff --git a/src/org/redkale/boot/ClassFilter.java b/src/org/redkale/boot/ClassFilter.java
index ecd76d225..f4138744e 100644
--- a/src/org/redkale/boot/ClassFilter.java
+++ b/src/org/redkale/boot/ClassFilter.java
@@ -551,10 +551,9 @@ public final class ClassFilter<T> {
             } else if (root.isDirectory()) {
                 if (exclude != null && exclude.equals(root)) return;
                 File[] lfs = root.listFiles();
-                if (lfs != null) {
-                    for (File f : lfs) {
-                        loadClassFiles(exclude, f, files);
-                    }
+                if (lfs == null) throw new RuntimeException("File(" + root + ") cannot listFiles()");
+                for (File f : lfs) {
+                    loadClassFiles(exclude, f, files);
                 }
             }
         }
diff --git a/src/org/redkale/net/Server.java b/src/org/redkale/net/Server.java
index 872b051c9..b24b3caa3 100644
--- a/src/org/redkale/net/Server.java
+++ b/src/org/redkale/net/Server.java
@@ -397,10 +397,9 @@ public abstract class Server<K extends Serializable, C extends Context, R extend
                 File root = new File(s.substring(0, s.length() - 1));
                 if (root.isDirectory()) {
                     File[] lfs = root.listFiles();
-                    if (lfs != null) {
-                        for (File f : lfs) {
-                            set.add(f.toURI().toURL());
-                        }
+                    if (lfs == null) throw new RuntimeException("File(" + root + ") cannot listFiles()");
+                    for (File f : lfs) {
+                        set.add(f.toURI().toURL());
                     }
                 }
             } else {