AutoJNI - Free C++ Boilerplate Generator

AutoJNI: Free Android NDK tool to instantly generate exact C++ boilerplate code. Prevent UnsatisfiedLinkError and app crashes in seconds.
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C++ JNI Boilerplate Generator

Generate exact C++ headers for your Android native methods.


  










    
How to Use This JNI Code Generator?

    
Writing JNI (Java Native Interface) code manually is frustrating and often leads to UnsatisfiedLinkError or app crashes in Android. This free tool automates the process.

    
    
    
        
  1. Enter your exact Android Package Name (e.g., com.example.myapp).
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  2. Type your Java Class Name where the native method is declared.
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  3. Enter the Method Name and select its Return Type.
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  4. Click Copy Code and paste the generated C++ boilerplate directly into your native-lib.cpp file.
    5. 
    


    
Frequently Asked Questions (FAQs)

    
    

        
Is this tool free to use?

        
Yes, this C++ JNI boilerplate generator is 100% free and runs completely in your browser. No data is sent to any server.

    


    

        
Why do my JNI methods keep crashing?

        
The most common reason for Android NDK crashes is a mismatch in the JNI method signature. Your C++ function name must exactly match the Java package and class structure (e.g., Java_package_name_ClassName_methodName). This tool ensures perfect naming convention.

    


    

        
Do I need an API for this?

        
No, this tool relies on pure client-side logic to convert Java/Kotlin method signatures into valid C++ code instantly without requiring third-party APIs.