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Asked: 2026-05-23T04:26:54+00:00

I’m playing with ServerSocket and I don’t see / find what the limit of

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I’m playing with ServerSocket and I don’t see / find what the limit of the backlog is. The docs don’t say anything about this:

http://download.oracle.com/javase/6/docs/api/java/net/ServerSocket.html#ServerSocket(int, int)

My code is like this:

serverSocket = ServerSocketChannel.open();
serverSocket.socket().bind(null, 10000);

but I assume that 10000 might be too much if a system doesn’t have enough RAM. So is there a way to determine the maximum value for backlog that I can use?

It seems like in c++ you can use SOMAXCONN – does something similar exist for Java?

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  1. Editorial Team

    If there were, it would be system dependent: for Windows

    The backlog parameter is limited
    (silently) to a reasonable value as
    determined by the underlying service
    provider. Illegal values are replaced
    by the nearest legal value. There is
    no standard provision to find out the
    actual backlog value.

    Linux states it a little differently but you would need to go through the sysctl interface (or possibly /proc).

    In any case, it would appear you would need to execute some system specific code.

    I believe most implementations will just use their maximum value if the specified value is “too big” so this may not be a concern for your application?

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