I am following this tutorial to build my first Java 3D application. I included in my project the java3D libraries and my DllLoader class that extracts (from the classpath to the jar's location) and loads the j3dcore-ogl.dll:
public class DllLoader {
private DllLoader() {
}
public static void extractAndLoad(String dll) throws IOException {
int aux = dll.lastIndexOf('/');
if (aux == -1) {
aux = dll.lastIndexOf('\\');
}
File dllCopy = new File((aux == -1) ? dll : dll.substring(aux + 1));
try {
System.load(dllCopy.getAbsolutePath());
} catch (UnsatisfiedLinkError e1) {
try {
DllLoader.copyFile(DllLoader.class.getResourceAsStream(dll), dllCopy);
System.load(dllCopy.getAbsolutePath());
} catch (IOException e2) {
}
}
}
private static void copyFile(InputStream pIn, File pOut) throws IOException {
if (!pOut.exists()) {
pOut.createNewFile();
}
DataInputStream dis = new DataInputStream(pIn);
FileOutputStream fos = new FileOutputStream(pOut);
byte[] bytes = new byte[1024];
int len;
while ((len = dis.read(bytes)) > 0) {
fos.write(bytes, 0, len);
}
dis.close();
fos.close();
}
}
Everything works fine if I run the project from Netbeans, or if I open the jar from the command line with java -jar Hello3DWorld.jar".
My problem is this: if I run the jar with a simple double click, nothing happens. The dll appears near the jar, but the frame never appears.
Putting some JOptionPane.showMessageDialog() in my code to find out what is going wrong, I realized that the execution throws no exception. It just freezes like in a loop after loading the dll. Can you help me to understand why it hangs only by double clicking the jar and what is the problem?
