JNI: java.lang.UnsatisfiedLinkError

[cadbilbao]

Hello:

I get this error message when calling 'Main.class':
Exception in thread "main" java.lang.UnsatisfiedLinkError: displayMessage
at HelloWorld.displayMessage(Native Method)
at Main.main(Main.java:6)

class Main
{
public static void main(String[] args)
{
HelloWorld hello = new HelloWorld();
hello.displayMessage();
}
}

And HelloWorld.java:
class HelloWorld
{
public native void displayMessage();
static
{
System.loadLibrary("HelloWorldImp"
}
}

What am I doing wrong?

 

[Mongooses]

the JNI tutorial should help:

http://java.sun.com/docs/books/tutorial/native1.1/index.html

HTH,
jc

 

[fechen]

It means JVM can't find your library, HelloWorldImp.dll on windows, HelloWorldImp.so on Solaris, etc.

 

[maxpower1]

>It means JVM can't find your library...

not necessarily. This unsatisfiedLinkError could mean that you forget to compile it correctly.

cadbilbao,
is your class located in a package? If it is in package, i.e.

package mypackage.test;


then when you create the header file(by running javah) for,

i.e. Myclass.java located inside test directory, make sure to compile it like this:-


javah mypackage\test\Myclass.java

starting from OUTSIDE of your mypackage directory. So if your dir structure is:-

D:\javapp\mypackage\test

then at the command prompt,navigate to D:\javapp directory
and type in javah command starting from there.


that should fix the error






~za~
You can't bring back a dead thread!