Sunny Chan blogs

I have upgraded this website to:

• Apache Roller 5.0


• Apache TOmcat 6.0.35


• Java 7 Update 2

If you have following the OpenJDK build Readme and try to compile OpenJDK on Ubuntu 11.10, you may see this error: 

/home/schan/openjdk7/build/linux-amd64/tmp/sun/javax.sound/jsoundalsa/obj64/PLATFORM_API_LinuxOS_ALSA_PCM.o: In function `DAUDIO_GetFormats':

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x1fd): undefined reference to `snd_pcm_format_mask_malloc'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x20a): undefined reference to `snd_pcm_close'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x225): undefined reference to `snd_pcm_hw_params_malloc'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x236): undefined reference to `snd_pcm_hw_params_get_format_mask'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x246): undefined reference to `snd_pcm_format_mask_free'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x259): undefined reference to `snd_pcm_hw_params_any'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x26a): undefined reference to `snd_pcm_hw_params_get_format_mask'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x277): undefined reference to `snd_pcm_hw_params_get_channels_min'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x288): undefined reference to `snd_pcm_hw_params_get_channels_max'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x2cf): undefined reference to `snd_pcm_format_mask_test'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x45d): undefined reference to `snd_pcm_hw_params_free'

/home/schan/openjdk7/build/linux-amd64/tmp/sun/javax.sound/jsoundalsa/obj64/PLATFORM_API_LinuxOS_ALSA_PCM.o: In function `setStartThresholdNoCommit':

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x48c): undefined reference to `snd_pcm_sw_params_set_start_threshold'

/home/schan/openjdk7/build/linux-amd64/tmp/sun/javax.sound/jsoundalsa/obj64/PLATFORM_API_LinuxOS_ALSA_PCM.o: In function `setStartThreshold':

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x4bf): undefined reference to `snd_pcm_sw_params'

/home/schan/openjdk7/build/linux-amd64/tmp/sun/javax.sound/jsoundalsa/obj64/PLATFORM_API_LinuxOS_ALSA_PCM.o: In function `setHWParams':

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x518): undefined reference to `snd_pcm_hw_params_any'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x531): undefined reference to `snd_pcm_hw_params_set_access'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x544): undefined reference to `snd_pcm_hw_params_set_format'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x557): undefined reference to `snd_pcm_hw_params_set_channels'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x58a): undefined reference to `snd_pcm_hw_params_set_rate_near'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x5dc): undefined reference to `snd_pcm_hw_params_set_buffer_size_near'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x60b): undefined reference to `snd_pcm_hw_params_set_period_time_near'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x61b): undefined reference to `snd_pcm_hw_params'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x647): undefined reference to `snd_pcm_hw_params_set_periods_near'

/home/schan/openjdk7/build/linux-amd64/tmp/sun/javax.sound/jsoundalsa/obj64/PLATFORM_API_LinuxOS_ALSA_PCM.o: In function `setSWParams':

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x67e): undefined reference to `snd_pcm_sw_params_current'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x6b4): undefined reference to `snd_pcm_sw_params_set_avail_min'

PLATFORM_API_LinuxOS_ALSA_PCM.c:(.text+0x6c4): undefined reference to `snd_pcm_sw_params'

--- old/make/javax/sound/jsoundalsa/Makefile    2011-10-28 02:28:00.000000000 -0400

+++ new/make/javax/sound/jsoundalsa/Makefile    2011-10-28 02:28:00.000000000 -0400

@@ -65,7 +65,7 @@

        $(MIDIFILES_export) \

        $(PORTFILES_export)

 

-LDFLAGS += -lasound

+EXTRA_LIBS += -lasound

 

 CPPFLAGS += \

        -DUSE_DAUDIO=TRUE \

These are the steps that I have made OpenJDK to compile on Windows platform:

1. Install Visual C++ 2010 Express (or if you are rich, get Visual Studio 2010 Professional) 


2. Install Windows 7 Platform SDK


3. Install Cygwin, install the packages suggested on OpenJDK Readme. Also install gcc for step 5


4. Install DirectX 9.0 SDK


5. The gnu make package in the current cygwin does not support Windows directory convention and you should compile your own version of the make 3.82 which has the correct support.


6. Download latest Freetype. 




• Compile it using Visual C++ - you can find the Visual C++ project file under <freetype src>/builds/win32/vc2010. 


• Make sure you have change the type of DLL it generates by going to Project->Properties, then Configuration Manager... button, set it to Release and Win32


• Make sure you have set it so that it builds a DLL - you can find that under Project->Properties, Configuration Properties, General and there should be a Configuration Type drop down box


• You can then build freetype. The DLL generated will have a version number attached to it (e.g. freetype245.dll) and you will need to make sure you rename it to freetype.dll.




7. Get latest Apache ANT


8. Make sure you have a Java 6 JDK installed


9. Download the openjdk source code, either using hg or source bundle (I will assume you put it in c:\openjdk)


10. Open a command prompt for Windows SDK by going to Start -> Windows SDK 7.1 -> Windows SDK 7.1 command prompt


11. For 32bit ONLY, you should run the Visual Studio compiler settings batch file: c:\program files\Microsoft Visual Studio 10.0\VC\bin\vcvars32.bat


12. Make sure you have override the standard cygwin bin path so that make.exe you have compiled in step 5 take precedent of the default cygwin.


13. Also check that the link.exe you run in the path is the actual Microsoft linker and not the cygwin's link command - you will need to fiddle with the path.


14. Setup a number of environment variables:




1. ALT_BOOTDIR should point to the Java 6 JDK (Step 8)


2. ALT_DXSDK_PATH is the DirectX SDK PATH (Step 4)


3. ALT_FREETYPE_LIB_PATH and ALT_FREETYPE_HEADERS_PATH.


4. ANT_HOME


5. HOTSPOT_BUILD_JOBS if you want to parallelize your build - you can't use -j options in the make command


6. ALLOW_DOWNLOADS=true so that it can download JAXP and JAXS jar


7. Make sure the path is setup correctly (Step 12/13)




15. You are ready to give it a go. First, run "make sanity" and see whether there is anything you setup incorrectly. If something is wrong, fix it.


16. If you have passed make sanity, you can run make to build the JDK! Go and make a cuppa, it will take a while. On my i7-2600 and hard drive it took 2 hours.

Important: In order to build a 32bit JDK you must use a 32bit System - ie. you cannot cross compile (ie. 64bit Windows and compile a 32bit JDK)

This is the abstract for my COSCUP talk on August 18th, 2011:

OpenJDK 7: The universal language runtime

Sunny Chan
Hong Kong Java User Group Leader

OpenJDK 7 is the latest release of the Java Platform. In this release, there are a number of major innovations in the OpenJDK's Java Virtual Machine to enable other scripting languages like Ruby, Python and PHP to run on the platform efficiently.

In this talk, I will give you 5 reasons why you should run your applications written in alternative languages like Ruby on the OpenJDK Runtime. I will also explore some of the common myths about running your application with the Java Runtime.

That's a little bit of fun for you today: You can write a 3D apps using javascript while using javascript agent!

Don't think you can do that with c# :-)

Well, the tomcat server that runs this roller weblog died last night - seems like it has running out of memory....

I am running thi weblog on a Xen VM with 128M  memory - seems like it is not enough! I can't really afford a proper hosted machine at the moment - otherwise I definitely would try to get more memory! Anyway, I have restarted the server now and it is all fine - maybe I need to switch JVM, and my old colleagues will bark!