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After learning about gwt plugin for eclipse, i decided to give it a try. Unfortunately, running hello world in itself became a learning curve.

Eclipse provides nice interface to install the plugins. It did not complain in installing gwt and app engine SDK's and other binaries. Hello world project was created with no issues. Till here was cake walk. Moment i started compiling, jvm threw up lots of backtraces.

Compiling module com.jatspeak.gwt.first.Firstcut
Locking assertion failure.  Backtrace:
#0 /usr/lib/libxcb-xlib.so.0 [0xb73ad7c7]
#1 /usr/lib/libxcb-xlib.so.0(xcb_xlib_unlock+0x31) [0xb73ad891]
#2 /usr/lib/libX11.so.6(_XReply+0x254) [0x8a653494]
#3 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/xawt/libmawt.so [0x8b76edce]
#4 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/xawt/libmawt.so [0x8b758d77]
#5 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/xawt/libmawt.so [0x8b758ef3]
#6 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/xawt/libmawt.so(Java_sun_awt_X11GraphicsEnvironment_initDisplay+0x26) [0x8b759136]
#7 [0xb13bf008]
#8 [0xb13b8b6b]
#9 [0xb13b8b6b]
#10 [0xb13b6236]
#11 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/server/libjvm.so [0xb764beec]
#12 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/server/libjvm.so [0xb781bae8]
#13 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/server/libjvm.so [0xb764bd1f]
#14 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/server/libjvm.so(JVM_DoPrivileged+0x32d) [0xb76a982d]
#15 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/libjava.so(Java_java_security_AccessController_doPrivileged__Ljava_security_PrivilegedAction_2+0x3d) [0xb735530d]
#16 [0xb13be898]
#17 [0xb13b8a94]
#18 [0xb13b6236]
#19 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/server/libjvm.so [0xb764beec]
Locking assertion failure.  Backtrace:
#0 /usr/lib/libxcb-xlib.so.0 [0xb73ad7c7]
#1 /usr/lib/libxcb-xlib.so.0(xcb_xlib_lock+0x2e) [0xb73ad96e]
#2 /usr/lib/libX11.so.6 [0x8a652619]
#3 /usr/lib/libX11.so.6(XGetVisualInfo+0x26) [0x8a648666]
#4 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/xawt/libmawt.so [0x8b7580b9]
#5 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/xawt/libmawt.so [0x8b758303]
#6 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/xawt/libmawt.so [0x8b758fa1]
#7 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/xawt/libmawt.so(Java_sun_awt_X11GraphicsEnvironment_initDisplay+0x26) [0x8b759136]
#8 [0xb13bf008]
#9 [0xb13b8b6b]
#10 [0xb13b8b6b]
#11 [0xb13b6236]
#12 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/server/libjvm.so [0xb764beec]
#13 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/server/libjvm.so [0xb781bae8]
#14 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/server/libjvm.so [0xb764bd1f]
#15 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/server/libjvm.so(JVM_DoPrivileged+0x32d) [0xb76a982d]
#16 /usr/lib/jvm/java-1.5.0-sun-1.5.0.16/jre/lib/i386/libjava.so(Java_java_security_AccessController_doPrivileged__Ljava_security_PrivilegedAction_2+0x3d) [0xb735530d]
#17 [0xb13be898]
#18 [0xb13b8a94]
#19 [0xb13b6236]

Solution :- You need to run awt in headless mode. Upon googling some folks prescribed that you better "sed" the .so file, but that is not required. Putting a VM argument -Djava.awt.headless=true will serve the purpose as well. Many times the programs like servlets etc may not know how to connect to a DISPLAY in windowing system. Thus headless will enable them to connect without a display

Thus, headless compiles the gwt project.

Movin forward, while running the project, again lots of linkages were found absent. Fortunately, the error mentions that that listdc++5.so cannot be opened.

Solution :- Ubuntu(8.10) ships with a mroe recent version of this library, so you will need to install the 5th version by sudo apt-get install libstdc++5

Conclusion :- In case your configuration has these two attributes

1. Java 1.5
2. Ubuntu Intrepid (8.10)

You may need to perform above two step in order to say Hello!

Finally finished configuration and created a new user. I took time to understand that unlike wordpress, movable is a blog cluster. There are global settings, an there are local settings as well. In case you need to add a new user, it is through global system setting, instead of manage->users in the blog dashboard.

Anyways, things have settled down now, and i wish to work on following two things in nest 2 weeks Drupal, Android and Thunderbird. My priority is Drupal -> Android -> Thunderbird. I have 11 days to finish it all. To assist in blogging, i have put scribefire in Firefox .

Hello All

I will be discussing the learning curves in here. I like code hacking and learning new things. All if this involves learning curves. I enjoy doing that, and will be posting about the learning curves on this blog. Here goes the first one, th blog installation in itself.

For the first time, i configured a movabletype blog for this purpose(learning curves involved here too!!). It was not a piece of cake as wordpress. I almost did it 1 hour back, and ran into cross site scripting issues, as i was loading the static files (css, js) from files.jatspeak.com and other stuff from blog.jatspeak.com. When i was about to write something, blog was screaming permission denied. Finally, everything from the scratch, and all went on fine :)

Following was my process...

1. Download movabletype from http://www.movabletype.com/downloads/blogger/MT-4.23-en.tar.gz
2. Untar it.
3. Fire up mysql. and create a new database, say "learning"
   
4. Locate cgi-bin in your httpd.conf, in my case it was at /usr/lib/cgi-bin.
5. From the untarred folder, copy everything else apart from mt-static folder, and put it somewhere on cgi-bin
6. Fire up http://<yourpath to cgi-bin>/mt.cgi.
7. It will generate a new mt-config.cgi file now.It will ask about the presense of mt-static folder. You will need to provide both filepath, and weburl. It is stores in StaticFilePath and StaticWebPath properties in mt-config.cgi.
8. It will take you through a series of nicely decorated, curve cornered windows in the process. After it says all is right, it will ask to crate a admin user (i got stuck at this point first)
9. After you give a user, it asks for publishing path. This is fairly simple.
   
10. You are done after this.It will take you to dashboard.

Pitfalls

1. There is somebug while writing mt-config.cgi file. If you did not provide a proper path, and submit details, an ugly looking page will greet you. This means that javascript and css have not loaded due to absense of a path. In case you use firefox, install firebug. It will complain saying "getById()" not found. These errors are due to incorrect StaticWebPath and Weburl etc. You need to fix them. Most probably, your mt-config.cgi file is improper.
2. Your dashboard comes up and you try to do a new post, but on clicking the editor nothing happens. This is die to cross site scripting prevention in firefox 3. You are most likely to face this problem in firefox 3 only. The firebug error would be "Permission denied to property w.App". Unfortunately, either live with it and use a different browser, or else simply reinstall everything. Remeber there are three different paths
   
1. Path to mt.cgi, in cgi-bin
2. Path to mt-static, which is asked while configuration
3. Path for publishing, which is asked sometime after you have creating admin user.
3. All 3 paths should be in same domain/subdomian. In my case, the domains were same, but subdomains were different. 

Following links helped me out.

• http://www.sixapart.com/movabletype/kb/upgrading/upgrade_script.html
• http://forums.sixapart.com/lofiversion/index.php/t54953.html
• http://forums.sixapart.com/lofiversion/index.php/t64577.html

Cross site scripting error just came to my mind.

In case you are stuck while installing MovableType, i'll be glad to help. Mail me at ashish[at]jatspeak.com

Next steps -

1. Create a new user
2. Put some nice theme
3. Starting doing real work.