Category: Programming

http://openenergymonitor.org/emon/node/6189   1. GNU ARM Tool Chain 2. IDE Eclipse 3. STmicro libraries 4. GDB Server 1. GNU ARM Tool Chain https://launchpad.net/gcc-arm-embedded $ sudo add-apt-repository ppa:terry.guo/gcc-arm-embedded (if using 14.04 follow extras steps when adding PPA) $ sudo apt-get update $ sudo apt-get install gcc-arm-none-eabi if 64bit, we need 32-bit libs $ sudo apt-get install lib32z1 lib32ncurses5 lib32bz2-1.0 2. Eclipse […]

I use this script to check all projects for outdated maven dependency

Tutorial : import svn with all history into github Step 1) Create a project on github Step 2) Init the github project by : Step 3) git clone https://github.com/mcheung63/GKD.git <— replace your project url Step 4) cd to that directory Step 5)  user https://github.com/nirvdrum/svn2git and run: Step 6) svn2git –rebase Step 7) git pull Step […]

It is hard to theme netbeans using traditional swing look & feel. The reason is netbean’s tab container is not traditional swing JTabbedPane. See the post https://netbeans.org/bugzilla/show_bug.cgi?id=150393 Netbeans use a AbstractViewTabDisplayerUI to support only few “default look & feel”, such as Metal, Nimbus, Aqua. see below: The problem is : This default look & feel tab container […]

https://github.com/mcheung63/peter-swing

if grub is running slowly on bochs, try to add “–no-rs-codes” to your grub-bios-setup command. It will be 0.5 sec versus 5 seconds different.

If you compiling binutils and have these error, just remove d-exp.c and try again. d-exp.c should be generated by d-exp.y but binutils makefile won’t delete it during “make distclean”

CFLAGS=’-I /opt/local/include -L /opt/local/lib’ CXXFLAGS=’-I /opt/local/include -L /opt/local/lib’ ./configure –prefix=/peter-dwarfdump make make install Because mac gcc doesn’t search for the /opt/local, so need to specific the path manually.

Empty bochs instrument crash in linux, but not in mac. My instrument code is nearly empty. core dump: configure: run by: bochsrcSDL.bxrc: instrument.h: instrument.cc:

Java has bug again. After you installed idk 1.8u25 in your mac, open Eclipse.app/Contents/MacOS/eclipse.ini, you will see: -vm /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home But actually this line has no effect, when you run eclipse with -console -debug, you still see it is running use idk 1.6 “-vm /System/Library/Frameworks/JavaVM.framework”. To fix it, change that line to -vm /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/bin/java Peter.

When you add the keyword “volatile” in front of variable declaration, it prevents compiler to optimize the line that are using that variable. But if the line is completely useless, compiler will still optimized it out, prevent to generate any byte code for it.

Below code has error, because the ${new} will crash old tomcat 7. JSTL has bug.

I have to package my kernel into a fat partition and load it up using grub, but mac doesn’t has a mkfs.vfat and “mount loopback” command. So I am creating a small programing using https://github.com/waldheinz/fat32-lib/ to manipulate the fat image by myself. So far these two small program can read & write a fat image: Read […]

Take a look line 170 from https://code.google.com/p/tightvncpanel/source/browse/trunk/src/main/java/com/glavsoft/viewer/swing/Surface.java This ((Graphics2D) g).setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY); make g.drawImage(offscreenImage,0,0,null); runs very slow on Mac Retina. Solve: set the value to “VALUE_RENDER_SPEED” instead of  VALUE_RENDER_QUALITY  

I spent lot of time to optimize the startup speed of my Java app from 10 seconds down to 6 seconds in my 2012 Mac air. I changed to MacBook 13″, the startup time become <=3. That proves the hard disk speed is the key to optimize the startup time. I am facing a new […]

The best way to trace IIS error 500 is to enable all log detail on screen, edit your web.config to

gcc, binutils and newlib can all be compiled at once. This article http://www.embecosm.com/appnotes/ean9/ean9-howto-newlib-1.0.pdf said gcc, binutils and newlib are from the same source tree. Using the following script can linkup all files into a single directory and compile all of them at once. Just put the directories (binutils-2.24 , gcc-4.9.0 , newlib-2.1.0) and the above script in the […]

Miglayout has bug? JPanel doens’t grow, but for JButton or JTextField, they can.

Type this command, ndisasm will hang (I guess it eat up all 4GB address space, disassemble offset starts at 0xfffffff0, which is very high address). My version is “NDISASM version 2.11.02 compiled on Apr 9 2014”, running on mac mavericks. temp file : temp.bin The bug is filed here https://sourceforge.net/p/nasm/bugs/557/

dot in mac and linux produce different kind of ortho edge. I think the dot version affected it. Here is dot version in linux: Here is dot version in mac:

This is a very simple java program to record from microphone and save it to wav file and playback

a good html 5 video streaming tutorial http://phoboslab.org/log/2013/09/html5-live-video-streaming-via-websockets

Jetty require servlet-api 2.5 to fix “java.lang.NoSuchMethodError: javax.servlet.ServletContext.getContextPath()Ljava/lang/String”, don’t add “org.mortbay.jetty servlet-api”, you need :

http://www.infoq.com/news/2013/12/api-versioning Contract versioning and API/Service versioning has always been a consideration for SOA based systems. Whether because of the impact it has on composability, or client-service governance, it is still something of an art rather than a science. There are many examples of groups giving the benefit of their experiences (e.g., around REST is extremely popular). However, recently Jean-Jacques Dubray […]

If I can understand this graph, i will say i am a firewall beginner, otherwise i am still outside the door. http://upload.wikimedia.org/wikipedia/commons/3/37/Netfilter-packet-flow.svg

I am using eclipse kelper in mac osx mavericks, it always hang. I finally got a work around solution from http://www.lazylab.org/197/eclipse/eclipse-hanging-on-startup-repair-corrupt-workspace/ Removing .snap File Open \.metadata\.plugins\org.eclipse.core.resources directory Remove .snap file in the directory Restart Eclipse Remove .indexes Folder Remove the \.metadata\.plugins\org.eclipse.core.resources\.root\.indexes directory Restart Eclipse Move .project mv workspace/.metadata/.plugins/org.eclipse.core.resources/.projects workspace/.metadata/.plugins/org.eclipse.core.resources/old.projects My script

Here is a working example using web socket to stream screen to html 5 player. The server is in java, I use websockify.py to route the websocket to java socket. html 5 player