java.io.IOException: Input/output error

    at java.io.FileInputStream.read(Native Method)

    at jline.Terminal.readCharacter(Terminal.java:99)

    at jline.UnixTerminal.readVirtualKey(UnixTerminal.java:128)

    at jline.ConsoleReader.readVirtualKey(ConsoleReader.java:1453)

    at jline.ConsoleReader.readBinding(ConsoleReader.java:654)

    at jline.ConsoleReader.readLine(ConsoleReader.java:494)

    at net.minecraft.server.ThreadCommandReader.run(ThreadCommandReader.java:31)

2012-01-15 21:09:12 [INFO] Starting minecraft server version 1.1

2012-01-15 21:09:12 [WARNING] **** NOT ENOUGH RAM!