Java.lang.UnsatisfiedLinkError when loading libaries

Question

Hi,
I coded an ejb, in which I want to call funtionality coming from a dll via JNI.
In order to achieve it I copied the libary 'XXX.dll' to the windows directory system32
and call in my ejb : System.loadLibary("XXX").
The following exception occured:
javax.ejb.EJBException: nested exception is: java.lang.RuntimeException: java.lang.UnsatisfiedLinkError: no XXX in java.library.path
Can anybody help me by saying
1) where to put the .dll and what path to set in calling System.loadLibary(...)
3) or even where and how to set the java.libary.path variable (Instance Template via configtool?)
Honour and points are garanteed.
Jens

Answer 1

Hi,
Check This,
File f = new File("C:");
System.out.println(f + " \t" + f.exists());
f = new File(f, "sampleDLL2");
System.out.println(f + " \t" + f.exists());
System.load( f.toString() );
When the library can not be found, you get a java.lang.UnsatisfiedLinkError with the message "no library in java.library.path". To solve this, move the library in one of the directories specified by java.library.path or alter the property so that it points to the directory containing your library. You can print this property with the following code:
1: System.out.println(System.getProperty("java.library.path"));
Another possibility when things do not work is when the DLL can be found, but the methods can not. A DLL exports functions according to specific names an calling conventions. When your compiler is not configured the right way your methods may get anther name than they should be. To solve this, you should include the header file generated by javah and configure your compiler the right way.
Thanks,
gopal