Unsatisified linker error using JNI

Question

Hello,

I wrote a Java class which accesses a method in the C dll through Jni. But i am getting the following error in windows.

java.lang.UnsatisfiedLinkError: Server.getNetworkDiagram(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;

Guess it is able to load the library.

Also i am building the .dll (for windows) and .so (for linux) from a set of common C files This works with .so file and i do not get any error.

Could you please help me out ? How do i debug here ?

Thanks, Sudarshan

Not sure whether it is misspelt because it works in linux. Below are the header file and the Java file.

========

JNI File

/* DO NOT EDIT THIS FILE - it is machine generated */

include

/* Header for class Server */

ifndef _Included_Server

define _Included_Server

ifdef __cplusplus

extern "C" {

endif

undef Server_GETNETWORK

define Server_GETNETWORK 1L

undef Server_SETLEVEL

define Server_SETLEVEL 2L

/* * Class: Server * Method: getNetworkDiagram * Signature: (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String; */ JNIEXPORT jstring JNICALL Java_Server_getNetworkDiagram (JNIEnv *, jobject, jstring, jstring, jstring);

/* * Class: Server * Method: setLevelQuery * Signature: (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;IILjava/lang/String;)Z */ JNIEXPORT jboolean JNICALL Java_Server_setLevelQuery (JNIEnv *, jobject, jstring, jstring, jstring, jint, jint, jstring);

ifdef __cplusplus

}

endif

endif

=========

Java File

public class Server { public native String getNetworkDiagram(String domain, String dest, String secret);

public void test()
{
    String domain = "domain1";
    String host = "2.2.2.30";
    String secret = "test";

    System.loadLibrary("libewapi");     
    String result = this.getNetworkDiagram(domain, host, secret);           
}

public static void main(String argv[]) throws Exception
{                   
    Server server = new Server();
    server.test();
}

}

Answer 1

there's a chance your referencing the library by a diferent name, maybe misspelled? or the both function names on the jni.h file or java class do not correspond.

could you post the function declaration in the jni.h file and the java native method implementation?