CODEWITHSUNDEEP
javaandroidandroid-ndk
user1480139
user1480139

Reputation: 383

JNI native method not found

I've got a package called com.example.remote in that package I have a Remote.java file with 

public native static void send_feedback(String feedback);

static {
    System.loadLibrary("com_example_remote_Remote");
}

then in my com_example_remote_Remote.c file I got this method:

JNIEXPORT void JNICALL Java_com_example_remote_Remote_send_feedback(JNIEnv *env, jclass clazz, jstring feedback)

Everything compiles. But when I do a call to the java function the program stops working and gives me:

12-19 12:21:31.183: E/AndroidRuntime(3196): FATAL EXCEPTION: main
12-19 12:21:31.183: E/AndroidRuntime(3196): java.lang.UnsatisfiedLinkError: Native method not found: com.example.remote.Remote.send_feedback:(Ljava/lang/String;)V
12-19 12:21:31.183: E/AndroidRuntime(3196):     at com.example.remote.Remote.send_feedback(Native Method)

I think my syntax is conform the rules of JNI. I deleted the obj map once I thought maybe it would solve the problem. I rebuild the project and still gives me that error.

EDIT:

changed the name to sendFeedback and now I get this error:

12-19 12:49:26.335: A/libc(3280): Fatal signal 11 (SIGSEGV) at 0x00000cd0 (code=0), thread 3280 (.example.remote)

Upvotes: 2

Views: 1354

Answers (2)

user1480139
user1480139

Reputation: 383

I've changed the name to sendFeedback so it's without the underscore. Also there was an error in the method what doesn't matter for this answer.

Upvotes: 0

Mukesh Kumar Singh
Mukesh Kumar Singh

Reputation: 4522

Add extern "C" in native method definition. i.e.

extern "C" JNIEXPORT void JNICALL Java_com_example_remote_Remote_send_feedback(JNIEnv *env, jclass clazz, jstring feedback){.......}

Or

If possible change MethodName in declaration and definition (in java file and .c file) because _ may be problem in method name. i.e.

public native static void sendFeedback(String feedback);


extern "C" JNIEXPORT void JNICALL Java_com_example_remote_Remote_sendFeedback(JNIEnv *env, jclass clazz, jstring feedback)
{
....
}

you may find a sample here

Upvotes: 1

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