if (f.exists()) {
// if exist try to delete it
f.delete();
}

So that your code will work in solaris too.

I just wanted to thank you for this solution. For a schoolproject I need to make a client/server solution, where there can be only one server instance because it has to be bound to a comport. I had tried the port/serversocket solution at first but found out that after longer periods of running ( > 3 days non-stop) the socket appeared to be open again and I could run a a second instance (which fubarred my complete app ). Your solution has been stable for 5 days both on a windows and a linux system.

So again, my thanks

Cheers!

Peter
Groningen, the Netherlands

@Nayanish : I’m not really familiar with solaris so I don’t think I can give solution for now.

@rnb : I assuming you’re creating desktop application with JSE. The concept will be the same, but you need to learn / find tutorial about AWT/Swing.. depends on the one you using.

@xyz : depends on how you design the locking file folder, the sample was use current folder from where user running it.
To prevent mistake, you can create example a bash script to running it so it will change to specific folder first.
Or put the lock file in absolute path.
Using socket is also a solution, but it will take 1 port for each.. depends on your need, if you need 1000 app with 1000 locking, using port will takes to much port.

>> File locking cannot be implemented on Solaris operating system because its file lock is advisory where as on Window platform its mandatory.

Any workaround for this?

Thanks
Nayn