JNI and C++ - UnsatisfiedLinkError

Question

I'm using JNI successfully to call some C code, however when I want to change to C++ JNI throws an `UnsatisfiedLinkError` whenever I try to call a method. This one works: ``` g++ -c -Icryptopp562 -O3 -fPIC -fpermissive CI3CppEncryptionToolsImpl.cpp gcc -I${JAVA_HOME}/include -O3 -shared -fPIC -o libCI3CppEncryptionTools.so de_zdv_research_emdu_CI3CppEncryptionTools.c CI3CppEncryptionToolsImpl.o -lcryptopp ``` With this one, I get an `UnsatisfiedLinkError`: ``` g++ -c -Icryptopp562 -O3 -fPIC -fpermissive CI3CppEncryptionToolsImpl.cpp g++ -I${JAVA_HOME}/include -O3 -shared -fPIC -fpermissive -o libCI3CppEncryptionTools.so de_zdv_research_emdu_CI3CppEncryptionTools.cpp CI3CppEncryptionToolsImpl.o -lcryptopp ``` The generated header is as follows: ``` /* DO NOT EDIT THIS FILE - it is machine generated */ #include <jni.h> /* Header for class de_zdv_research_emdu_CI3CppEncryptionTools */ #ifndef _Included_de_zdv_research_emdu_CI3CppEncryptionTools #define _Included_de_zdv_research_emdu_CI3C…

Accepted Answer

In implementation (.cpp) you have written function as

```
jstring Java_de_zdv_research_emdu_CI3CppEncryptionTools_encrypt(JNIEnv *env, jobject obj, jstring s){
       //---------
}
```

Please write it as

```
JNIEXPORT jstring JNICALL Java_de_zdv_research_emdu_CI3CppEncryptionTools_encrypt
(JNIEnv *, jclass, jstring){
       //------------
}
```

JNI and C++ - UnsatisfiedLinkError

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