Java theory and practice: Plugging memory leaks with weak references For garbage collection (GC) to reclaim objects no longer in use by the program, the logical lifetime of an object (the time that the application will use it) and the actual lifetime of outstanding references to that object must be the same. Most of the time, good software engineering techniques ensure that this happens automatically, without us having to expend a lot of attention on the issue of object lifetime. But every once in a while, we create a reference that holds an object in memory much longer than we expected it to, a situation referred to as unintentional object retention. Memory leaks with global Maps The most common source of unintentional object retention is the use of a Map to associate metadata with transient objects. Listing 1. Back to top Identifying memory leaks The first sign that your program has a memory leak is usually that it throws an OutOfMemoryError or starts to exhibit poor performance because of frequent garbage collection. Listing 2. Figure 1. See Listing 3.
Ubuntu 12.04 – setting up my Wifi Hotspot « thenewbieblog Please Note: As the Title suggests – I am a newbie, Please do not expect in-depth computer support. I can only say that the setup below really does work on my netbook. Perhaps it will work on yours too! The first thing I wanted to do after installing Ubuntu 12.04 is setup a wifi hotspot. I have a Samsung Netbook N130. I use a usb-modem to connect to the internet. Gathering information: Opening a terminal and typing the following command : #lspci Showed me that I have a : Network controller: Atheros Communications Inc. #lsmod Shows that it uses the ath9k drivers (this information may help you to google for setup information specific to your machine.) Also #iwconfig will give you the name of your wireless adapter name for example: “wlan0 “or “wlan1” (note that the “0″ and “1″ are numbers not letters) Installing Programs I then installed 2 programs via apt. #sudo apt-get install dhcp3-server #sudo apt-get install hostapd Editing Configuration Files In a terminal: #sudo gedit 1. Save the file. 2. To 3. 4.
Apache Jena - Apache Jena BrainWave Generator NTF -New Technology Foundation-Micromouse2010 NTFトップ > マイクロマウス > Micromouse2012(English) Schedule : November 23(Fri)-25(sun), 2012 Venue : Techno plaza, Shibaura Institute of Technology, Toyosu Campus: 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548 JAPAN Organizer ： New Techology Foundation Co-Orgnizer ： Executive committee : chair Hasegawa Tadahiro (Shibaura Institute of Technology) Gold Sponser ： Sponsored by ： Mediasponsor: Awards is offered by： Brochures and posters: pdf(Japanese only) Program : November 23(Fri): 14:30-18:00 : Trial runs for every contestant. Half-size Micromouse Contest (Preliminary) The size of maze, the coodinates of goal and the time limit are follows : size of maze: 16x16 entrance of goal area : x10 y11 size of goal area : 2x2 blocks There is no pole in the goal area time limit for a micromouse : 7 minutes Half-size Micromouse Contest (Final) Micromouse 2012 will be webcast. Micromouse 2012 preliminary, airdate:11/24 9:30(JST) *webcasting is provided by Necovideo Visual solutions