From 109abe1ba34534fc237e75a54c385ca682272396 Mon Sep 17 00:00:00 2001
From: XenoAmess <xenoamess@gmail.com>
Date: Wed, 13 Oct 2021 16:35:48 +0800
Subject: [PATCH] potential NPE in PackageInternalsFinder (#1998)

---
 .../compiler/PackageInternalsFinder.java       | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/memorycompiler/src/main/java/com/taobao/arthas/compiler/PackageInternalsFinder.java b/memorycompiler/src/main/java/com/taobao/arthas/compiler/PackageInternalsFinder.java
index cc5d183e7..80fdf0597 100644
--- a/memorycompiler/src/main/java/com/taobao/arthas/compiler/PackageInternalsFinder.java
+++ b/memorycompiler/src/main/java/com/taobao/arthas/compiler/PackageInternalsFinder.java
@@ -95,14 +95,16 @@ public class PackageInternalsFinder {
         List<JavaFileObject> result = new ArrayList<JavaFileObject>();
 
         File[] childFiles = directory.listFiles();
-        for (File childFile : childFiles) {
-            if (childFile.isFile()) {
-                // We only want the .class files.
-                if (childFile.getName().endsWith(CLASS_FILE_EXTENSION)) {
-                    String binaryName = packageName + "." + childFile.getName();
-                    binaryName = binaryName.replaceAll(CLASS_FILE_EXTENSION + "$", "");
-
-                    result.add(new CustomJavaFileObject(binaryName, childFile.toURI()));
+        if (childFiles != null) {
+            for (File childFile : childFiles) {
+                if (childFile.isFile()) {
+                    // We only want the .class files.
+                    if (childFile.getName().endsWith(CLASS_FILE_EXTENSION)) {
+                        String binaryName = packageName + "." + childFile.getName();
+                        binaryName = binaryName.replaceAll(CLASS_FILE_EXTENSION + "$", "");
+
+                        result.add(new CustomJavaFileObject(binaryName, childFile.toURI()));
+                    }
                 }
             }
         }