Hunt down java.net.SocketException: No buffer space available

Question

Hi I have very ugly problem with: java.net.SocketException: No buffer space available (maximum connections reached?) It is client-server app. Client is Windows XP SP2 32

Answer 1

What we tried (and successfully) kill the problem. JAVA - check again every socket we used, register them in some special class if needed
- provide SocketFactory and ServerSocketFactory for every class which open socket itself (for example jboss Connectors)
- check opened files, close them in finally
- URL opens connection too, but if you ask for stream after that, connection is closed together with stream (thanks Stephen).

OS
- use different java (1.5, 1.6, 1.7)
- install new drivers
- use netstat and monitor traffic on background (using scripts, yes win xp can do the scripts pretty nicely). Use advanced packet sniffers (wire shark?) if needed.
- win xp have limit for concurrent connections, check them (google) too
- check again and again for virus and mallware (even on private network!)

Answer 2

It certainly sounds like you are leaking Sockets somehow in your app.

• Check that your code always closes the Sockets it opens ... even in the event of some exception; i.e. do the close in a finally block.
• If your code uses URL connections, make sure that they get disconnected.
• I'm not an expert, but should your code close its InitialContext object?

Answer 3

After reading the advice offered in this link! I was able to determine that I was using isDisplayed() way too often in too short of a time. Therefore, I placed a 5 millisecond wait between calls to isDisplayed. This fixed my Socket Exception issue.

    for (final WebElement person: persons){
        if (person.isDisplayed()){
            dosomething;
            sleep 5 milliseconds
        }
    }

As stated in the link you should insert a try catch just in case this wait is not long enough.