Bagaimana cara mengatasi kesalahan "java.net.BindException: Alamat sudah digunakan: JVM_Bind"?

Di Eclipse, saya mendapatkan kesalahan ini: run: [java] Error creating the server socket. [java] Oct 04, 2012 5:31:38 PM cascadas.ace.AceFactory bootstrap [java] SEVERE: Failed to create world : java.net.BindException: Address already in use: JVM_Bind [java] Java Result: -1 BUILD...