React native expection java.lang.UnsatisfiedLinkError: dlopen failed: “/data/data/{package}/lib-main/libgnustl_shared.so” is 32-bit instead of 64-bit

React Native “java.lang.UnsatisfiedLinkError: dlopen failed” Error: 32-bit Library Issue

This error, “java.lang.UnsatisfiedLinkError: dlopen failed: “/data/data/{package}/lib-main/libgnustl_shared.so” is 32-bit instead of 64-bit”, is a common issue encountered when developing React Native applications for Android. It arises when a 32-bit native library is being loaded into a 64-bit Android environment.

Understanding the Problem

32-bit vs. 64-bit Architecture

Android devices come with both 32-bit and 64-bit architectures. A 64-bit device can run both 32-bit and 64-bit applications. However, libraries need to match the target architecture.

The Issue

The error message indicates that you are trying to load a 32-bit native library (`libgnustl_shared.so`) in a 64-bit Android environment. This incompatibility causes the error.

Causes

Here are common causes of this error:

• **Using an outdated or incompatible native library:** Some libraries might not have 64-bit versions. If the library is only provided in 32-bit, the error occurs.
• **Incorrectly configured project:** Issues in your React Native project setup, especially in build tools or dependencies, might force the loading of a 32-bit library.
• **Android Emulator Setup:** Issues related to your Android emulator or device’s CPU architecture can contribute to the problem.

Troubleshooting and Solutions

1. Check for 64-bit Compatibility

• **Library Compatibility:** Verify if the native library in question supports 64-bit. Contact the library developer for updates.
• **Dependencies:** Check your `package.json` for any dependencies with known 32-bit limitations. Consider using alternative 64-bit compatible libraries.

2. Configure Your Project (Android)

This section requires you to work within your React Native Android project directory.

Configure build.gradle

Navigate to your Android project directory and open `android/app/build.gradle` file. Edit the following lines to enforce 64-bit support:

android {
    ...
    ndkVersion "21.4.7075529" // Ensure you use a recent NDK version
    defaultConfig {
        ...
        ndk {
            abiFilters "armeabi-v7a", "arm64-v8a" // Include both 32-bit and 64-bit architectures
        }
    }
    ...
}

Rebuild Your Project

After making these changes, ensure you rebuild your project:

./gradlew clean
./gradlew assembleRelease

3. Verify Android Emulator Configuration

• **Emulator Type:** Ensure you are using an Android emulator that supports 64-bit execution (typically recommended for modern apps).
• **CPU/ABI Settings:** When creating the emulator, check your CPU/ABI settings and select a 64-bit architecture (e.g., “ARM64-v8a”).

4. Update Dependencies

Keep your React Native and related dependencies updated to the latest stable versions. Updates often address compatibility issues.

npm update // Or yarn upgrade

Example: 32-bit vs. 64-bit Library Compatibility

Additional Tips

• **Console Logging:** Utilize `console.log()` or `console.warn()` to log messages about the loaded native libraries during your development process.
• **Debugging:** If you suspect a problem with your native library integration, consult your library’s documentation or seek assistance in online forums or developer communities.

Conclusion

The “java.lang.UnsatisfiedLinkError: dlopen failed” error indicates a mismatch between the architecture of your native library and the Android environment. By understanding the issue, applying the solutions above, and considering architectural compatibility in your project, you can resolve this error and ensure your React Native application runs seamlessly on both 32-bit and 64-bit Android devices.