Having JAR extract and execute a file

Question

Not sure if this is the right board, but I am having trouble with this program. Basically I want the JAR file to extract the file included (test.exe) and then execute it on the system. After successfully getting it to work on my computer, I tested it on some of my others. However, the file would not even extract, let alone run. Is there something I am missing?
Here is the code:
try {
try {
JarFile jarFile = new JarFile("test.jar");
InputStream in = jarFile.getInputStream(jarFile.getEntry("test.exe"));
OutputStream out = new FileOutputStream("C:\\test.exe");
int c;
while ((c = in.read()) != -1) {
out.write(c);
in.close();
out.close();
jarFile.close();
} catch (IOException ex) {
Logger.getLogger(test.class.getName()).log(Level.SEVERE, null, ex);
Process p = Runtime.getRuntime().exec("C:\\test.exe");
} catch (IOException ex) {
Logger.getLogger(test.class.getName()).log(Level.SEVERE, null, ex);
}

Answer 1

The probable cause is that the input jar isn't being found. Try giving an absolute address for the jar.
By the way, nesting try/catch blocks isn't necessary and is unnecessarily complicated. This construct has the same effect.
try
    JarFile jarFile = new JarFile("test.jar");
    InputStream in =
        jarFile.getInputStream(jarFile.getEntry("test.exe"));
    OutputStream out = new FileOutputStream("C:\\test.exe");
    int c;
    while ((c = in.read()) != -1)
        out.write(c);
    in.close();
    out.close();
    jarFile.close();
    Process p = Runtime.getRuntime().exec("C:\\test.exe");
catch (IOException ex)
    Logger.getLogger(test.class.getName()).log(Level.SEVERE, null, ex);
}