JNLP nativelib UnsatisfiedLinkError

Question

How do I let System.loadlibrary() to search for .dll in the signed jar file?
I could not find a satisfactory & direct answer on any jnlp forum.
Thanks in advance.
Gaurav.
Already Tried:
1.In the .jnlp file, <nativelib> element points to the signed jar file containing dlls
2.System.loadlibrary by default checks in the current directory for .dll file or java.library.path .
3. java.library.path pointed to cache where java web start downloads the .dll file
Points 1,2,3 did not help me.

Answer 1

hi there,
Jar files are signed with different certificates.
NO they are signed with the same certificate, cross checked it.The DLL's are not in the root of the signed jar file.
Signed Jar FIle contains only one hello.dll , which simply displays "Hello World"jarsigner" -keystore olpKeys hell.jar olp
hell.jar contains HelloWorld.classThe System.loadlibrary() call doesn't match the DLL name correctly.
static {
System.loadlibrary("hello")
This is where the Exception is thrown. Details of the Exception are shown below.
If you have more than one DLL and they have dependencies, the order of System.loadlibrary() for each DLL matters
Just One DLL present in the signed jar file.*****************************************************************************************
Java Main Class Code:
public class HelloWorld {
public native void displayHelloWorld();
public HelloWorld() {
static {
System.loadLibrary("hello");
public static void main(String[] args) {
HelloWorld obj = new HelloWorld();
obj.displayHelloWorld();
JNLP Code:
hell.jar contains HelloWorld.class
helldll.jar contains hello.dll<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+"
codebase="http://localhost:8080/player/hello/"
>
<information>
<title>Time Check</title>
<vendor>Java Developer Connection</vendor>
<homepage href="/olp" />
<description>Demonstration of Offline Player thru JNLP</description>
</information>
<offline-allowed/>
<security>
<all-permissions/>
</security>
<resources>
<j2se version="1.3+" />
<jar href="hell.jar"/>
</resources>
<resources os="windows">
<nativelib href="helldll.jar"/>
</resources>
<application-desc main-class="HelloWorld" />
</jnlp>
Exception Details :
ava.lang.UnsatisfiedLinkError: no hello in java.library.path
     at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1403)
     at java.lang.Runtime.loadLibrary0(Runtime.java:788)
     at java.lang.System.loadLibrary(System.java:832)
     at HelloWorld.<clinit>(HelloWorld.java:18)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at com.sun.javaws.Launcher.executeApplication(Unknown Source)
     at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
     at com.sun.javaws.Launcher.continueLaunch(Unknown Source)
     at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)
     at com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)
     at com.sun.javaws.Launcher.run(Unknown Source)
     at java.lang.Thread.run(Thread.java:536)
Directory Structure:
player/hello/
hell.jar ................jar containing HelloWorld.class
helldll.jar ......... jar containing hello.dll
olpkeys ..........keystore
Thanks for your interest.