JNI Dependent Libraries Not Found

[Omkar Shetkar]

Hi All,

I am newbie to JNI API. I am trying to do a HelloWorld program using it. I have written a Java program (Test.java) containing a native method. The native method is implemented in 'C'(Test.c) to print a string. On these files

1. I compiled Test.java. - javac
2. Generated a header file. - javah
3. Taken the method signature form Test.h an put it into Test.c
4. Using cl command generated a test.dll file
5. Tried to run it using java Test but getting the following error

Exception in thread "main" java.lang.UnsatisfiedLinkError: D:\JNITest\test.dll:
Can't find dependent libraries
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(Unknown Source)
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.loadLibrary0(Unknown Source)
at java.lang.System.loadLibrary(Unknown Source)
at Test.<clinit>(Test.java:7)

All of my files are in a single folder.

Will be waiting for your replies...

Thanks in advance

Regards,
Omkar V S

[Rob Spoor]

It seems it can find your test.dll, it just can't find one or more of the libraries test.dll depends on.

What libraries are you calling from Test.c?

[Omkar Shetkar]

My 'C' program is

#include <jni.h>
#include "Test.h"
#include <stdio.h>


JNIEXPORT void JNICALL Java_Test_getValue
(JNIEnv *e, jobject obj)
{
printf("Hello World!");
}


Command used to generate dll:

D:\JNITest\Test\Test>cl -IC:\Progra~1\Java\jdk1.5.0_06\include\ -IC:\Progra~1\Jav
a\jdk1.5.0_06\include\win32\
-MD -LD Test.c -Fetest.dll


Regards,
Omkar V S

[Rob Spoor]

I'm not familiar with CL, but are you sure you are compiling it as a DLL? With gcc (from MinGW ) I have to specify this explicitly with the "-shared" flag.

[Omkar Shetkar]

Thanks Rob. I got it working in Linux. Finally I need to implement this in Linux environment.