How Can I Resolve "Unsatisfied Linkerror" Jni

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Hi
Iam getting an Exception "UnsatisfiedLinakge error" ie,

Exception in thread "main" java.lang.UnsatisfiedLinkError: test.HelloWorld.print()V
at test.HelloWorld.print(Native Method)
at test.HelloWorld.main(HelloWorld.java:24)

Iam using Netbeans7.1 and Eclipse to link Java and C++

Please see the below code..

Java Part
*************

Java

package test;
public class HelloWorld
{    
    static
    {
       // System.load("C:\\eclipse\\ws\\HelloWorld\\Debug\\libHelloWorld.dll");
        System.loadLibrary("libHelloWorld");
    }
    private native void print();

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)
    {
        // TODO code application logic here
          
       new HelloWorld().print();
                       
    }
}

C++ - ECLIPSE
***********

"hello_jni.h"
****************

C++

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class helloworld_HelloWorld */

#ifndef _Included_test_HelloWorld
#define _Included_test_HelloWorld
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     helloworld_HelloWorld
 * Method:    print
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_test_HelloWorld_print(JNIEnv *, jobject);

#ifdef __cplusplus
}
#endif
#endif

"hello_jni.cpp"
******************

C++

include "hello_jni.h"
using namespace std;
/*
 * Class:     hello_jni.cpp
 * Method:    print
 * Signature: ()V
 */

JNIEXPORT void JNICALL Java_test_HelloWorld_print(JNIEnv * env, jobject jobj)
{
	std::cout<<"Iside C++ native method HELLOOOOOOOOOOOOOOOOOOO";
	return;
}

Please Help
Thanks in advance.

Posted 26-Feb-15 4:37am

Member 11482626

Updated 27-Feb-15 3:25am

Richard MacCutchan

v9

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Richard MacCutchan 26-Feb-15 11:36am

How did you generate your C++ header file?

Member 11482626 26-Feb-15 12:55pm

using javah command ie, javah test.HelloWorld then implemented c++ file

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Vladimir Svyatski · Answer 1 · 2015-02-27T00:21:00

Solution 1

I haven't touched JNI for a while, but I believe your C++ library is statically linked to jni.dll. When your program is running it cannot load your DLL because the system cannot find jni.dll in the default search path and as a result your DLL cannot be loaded. So check that.

Posted 27-Feb-15 0:21am

Vladimir Svyatski

Richard MacCutchan · Answer 2 · 2015-02-27T03:58:00

I suspect that you do not have a default path for java.library.path so java cannot locate the DLL. I just built your project, copied the DLL to the same directory as the class file ...

 Directory of C:\Users\Richard\Documents\Java\jni2\test

27/02/2015  14:45    <dir>          .
27/02/2015  14:45    <dir>          ..
27/02/2015  14:28               463 HelloWorld.class
27/02/2015  14:27               481 HelloWorld.java
27/02/2015  14:44            37,376 libHelloWorld.dll
               3 File(s)         38,320 bytes
               2 Dir(s)  123,847,589,888 bytes free
</dir></dir>

... and typed the command ...

java -Djava.library.path=C:\Users\Richard\Documents\Java\jni2\test test/HelloWorld

receiving the result

Iside C++ native method HELLOOOOOOOOOOOOOOOOOOO