Question

I have made a little program in java that accepts a string as a user input. Now i have made a dll writing its code in Visual C++. when i run my program from netbeans it displays this exception.

Exception in thread "main" java.lang.UnsatisfiedLinkError: Prompt.getLine(Ljava/lang/String;)Ljava/lang/String;
        at Prompt.getLine(Native Method)
        at Prompt.main(Prompt.java:19)

What problem is this. Need Help. Thanks

This is java code

public class Prompt {

    /**
     * @param args the command line arguments
     */
    private native String getLine(String prompt);
    public static void main(String[] args) {
        // TODO code application logic here
        Prompt p = new Prompt();
        String input = p.getLine("Type a line:");
        System.out.println("User Typed:" + input);
    }
    static {
        System.loadLibrary("Prompt");
        //System.load("C:/Program Files/Java/jdk1.6.0/bin/Prompt.dll");
    }
}

and this is C++ Code

#include "stdafx.h"
#include "jni.h"
#include "jni_md.h"

JNIEXPORT jstring JNICALL Java_Prompt_getLine(JNIEnv *env, jobject obj, jstring prompt)
{
    char buf[128];
    const char *str;
    str = env->GetStringUTFChars(prompt,0);
    if (str == NULL) {
        return NULL; /* OutOfMemoryError already thrown */
    }
    printf("%s", str);
    env->ReleaseStringUTFChars(prompt, str);
    /* We assume here that the user does not type more than
    * 127 characters */
    scanf("%s", buf);
    return env->NewStringUTF(buf);
}

Answer 1

@org.life.java….i got the problem and it was my mistake, i was not including the header file of java which is JNI style header file which is Prompt.h in c++, “#include "jni_md.h” this will be eliminated and included "Prompt.h" now it is working fine.