From 3197966e9768cfdcaf68ed04f8d1bb28808ef80f Mon Sep 17 00:00:00 2001
From: Nathan Walker <walkerrunpdx@gmail.com>
Date: Thu, 9 Apr 2026 08:48:31 -0700
Subject: [PATCH] fix: ensure dex cache directory exists before proxy
 generation

Harden dex directory setup in RuntimeHelper with existence check and fallback to files/secondary-dexes when code_cache is unavailable. Add defensive parent directory creation in ProxyGenerator.saveProxy() to prevent ENOENT crashes on newer Android versions.
---
 .../app/src/main/java/com/tns/RuntimeHelper.java     | 12 ++++++++++++
 .../main/java/com/tns/bindings/ProxyGenerator.java   |  4 ++++
 2 files changed, 16 insertions(+)

diff --git a/test-app/app/src/main/java/com/tns/RuntimeHelper.java b/test-app/app/src/main/java/com/tns/RuntimeHelper.java
index 90a64f16e..fa1542966 100644
--- a/test-app/app/src/main/java/com/tns/RuntimeHelper.java
+++ b/test-app/app/src/main/java/com/tns/RuntimeHelper.java
@@ -123,6 +123,18 @@ public static Runtime initRuntime(Context context) {
 
                 ClassLoader classLoader = context.getClassLoader();
                 File dexDir = new File(rootDir, "code_cache/secondary-dexes");
+                if (!dexDir.exists()) {
+                    dexDir.mkdirs();
+                }
+                if (!dexDir.exists() || !dexDir.canWrite()) {
+                    if (logger.isEnabled()) {
+                        logger.write("Unable to use dex dir: " + dexDir.getAbsolutePath() + ", falling back to files/secondary-dexes");
+                    }
+                    dexDir = new File(appDir, "secondary-dexes");
+                    if (!dexDir.exists()) {
+                        dexDir.mkdirs();
+                    }
+                }
                 String dexThumb = null;
                 try {
                     dexThumb = Util.getDexThumb(context);
diff --git a/test-app/runtime-binding-generator/src/main/java/com/tns/bindings/ProxyGenerator.java b/test-app/runtime-binding-generator/src/main/java/com/tns/bindings/ProxyGenerator.java
index 546b42593..52506fbd5 100644
--- a/test-app/runtime-binding-generator/src/main/java/com/tns/bindings/ProxyGenerator.java
+++ b/test-app/runtime-binding-generator/src/main/java/com/tns/bindings/ProxyGenerator.java
@@ -58,6 +58,10 @@ public String generateProxy(String proxyName, ClassDescriptor classToProxy, Hash
 
     private String saveProxy(String proxyName, byte[] proxyBytes) throws IOException {
         File file = new File(path + File.separator + proxyName + ".dex");
+        File parentDir = file.getParentFile();
+        if (parentDir != null && !parentDir.exists()) {
+            parentDir.mkdirs();
+        }
         file.createNewFile();
         FileOutputStream stream = new FileOutputStream(file);
         stream.write(proxyBytes);