src/org/redkale/boot/Application.java

@@ -688,10 +688,13 @@ public final class Application {
     private void clearPersistData() {
         File cachedir = new File(home, "cache");
         if (!cachedir.isDirectory()) return;
-        for (File file : cachedir.listFiles()) {
+        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

src/org/redkale/boot/ClassFilter.java

@@ -550,10 +550,13 @@ public final class ClassFilter<T> {
                 files.add(root);
             } else if (root.isDirectory()) {
                 if (exclude != null && exclude.equals(root)) return;
-                for (File f : root.listFiles()) {
+                File[] lfs = root.listFiles();
+                if (lfs != null) {
+                    for (File f : lfs) {
                         loadClassFiles(exclude, f, files);
                     }
                 }
             }
         }
+    }
 }

src/org/redkale/net/Server.java

@@ -396,10 +396,13 @@ public abstract class Server<K extends Serializable, C extends Context, R extend
             if (s.endsWith("*")) {
                 File root = new File(s.substring(0, s.length() - 1));
                 if (root.isDirectory()) {
-                    for (File f : root.listFiles()) {
+                    File[] lfs = root.listFiles();
+                    if (lfs != null) {
+                        for (File f : lfs) {
                             set.add(f.toURI().toURL());
                         }
                     }
+                }
             } else {
                 File f = new File(s);
                 if (f.canRead()) set.add(f.toURI().toURL());