Question

I’m trying to make a call that might throw an exception due to server being down.
this is what i want to accomplish:

Server server = serverQueue.poll();
try {
     if (server==null){return null}
     server.makeConnection();

} catch (Exception e) {
     // try another server
     server = serverQueue.poll();
     // now return to try block?

}

So i have 5 servers and maybe in later stage i’ll add some more. So i want to connect to
anyone of them in this manner. How can i return to the try block? is there anything such as a statement like this below in java?:

Server server = serverQueue.poll();
outerBlock:
try {
     if (server==null){return null}
     server.makeConnection();

} catch (Exception e) {
     // try another server
     server = serverQueue.poll();
     continue outerBlock;

}

Answer 1

Basically a loop:

Server server = serverQueue.poll();
boolean connected = false;
while (!connected) {
    if (server == null) {
        return null;
    }
    try {
         server.makeConnection();
         connected = true;
    } catch (Exception e) {
         // Presumably log something here, for management info

         // try another server
         server = serverQueue.poll();
    }
}

Or to avoid the duplication:

Server server;
boolean connected = false;
while (!connected) {
    server = serverQueue.poll();
    if (server == null) {
        return null;
    }
    try {
         server.makeConnection();
         connected = true;
    } catch (Exception e) {
         // Presumably log something here, for management info
    }
}

You might consider isolating the “find a server” part of that into its own function.