src/org/redkale/boot/Application.java

@@ -688,8 +688,11 @@ public final class Application {
     private void clearPersistData() {
         File cachedir = new File(home, "cache");
         if (!cachedir.isDirectory()) return;
-        for (File file : cachedir.listFiles()) {
-            if (file.getName().startsWith("persist-")) file.delete();
+        File[] lfs = cachedir.listFiles();
+        if (lfs != null) {
+            for (File file : lfs) {
+                if (file.getName().startsWith("persist-")) file.delete();
+            }
         }
     }
 

src/org/redkale/boot/ClassFilter.java

@@ -550,8 +550,11 @@ public final class ClassFilter<T> {
                 files.add(root);
             } else if (root.isDirectory()) {
                 if (exclude != null && exclude.equals(root)) return;
-                for (File f : root.listFiles()) {
-                    loadClassFiles(exclude, f, files);
+                File[] lfs = root.listFiles();
+                if (lfs != null) {
+                    for (File f : lfs) {
+                        loadClassFiles(exclude, f, files);
+                    }
                 }
             }
         }

src/org/redkale/net/Server.java

@@ -396,8 +396,11 @@ 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()) {
-                        set.add(f.toURI().toURL());
+                    File[] lfs = root.listFiles();
+                    if (lfs != null) {
+                        for (File f : lfs) {
+                            set.add(f.toURI().toURL());
+                        }
                     }
                 }
             } else {