Dinesh's Web Log

Using custom errors in Axis2/C

2008-01-19T09:35:00.001+05:30

In this blog entry [link], I demonstrated usage of the Axis2/C custom errors using modified echo server sample. With presented code segments , I think I made my self clear to the reader about the topic. In recent past , saw users asking about custom errors in the axis-c-dev mailing list in several times. Therefore I think this post will find them helpful. If you see any point to improve please drop me a comment.

Axis2/C, default HTTP transport should be libcurl based

2008-01-14T23:21:00.000+05:30

Here [link] I discussed why I think , we should move for libcurl as our default HTTP transport implementation in Axis2/C. It is due to many plus point of successful and complete HTTP implementation of libcurl library. Please feel free to share your thoughts with us.

Nethu.org

2008-01-11T17:09:00.000+05:30

http://nethu.org is up. Check it out !

WSF/C user and developer resources

2008-01-09T16:14:00.000+05:30

Here I posted about some resources for Axis2/C and WSF/C, developers and users. Any one can use those resource to get best use from WSF/C. In that post , I mainly focused on Axis2/C , and any one who interested in other components of WSF/C have some important information there too.

return with new name

2008-01-05T12:03:00.000+05:30

It is long time after last blog ! Here I came with a new name now it is
http://xydinesh.com .

Life is full of choices !!!

2007-05-01T21:50:00.000+05:30

You know my friend, life is full of choices at least we should try some ... I decided to move my blog to wordpress, I created my wordpress account while ago but didn't get a chance (or I didn't want to ) blogging.
My new wordpress address will be http://xydinesh.wordpress.com. If you find any inconvenience , my apologies.

Axis2/C 0.94 Released !!!

2006-10-08T11:57:00.000+05:30

Axis2/c 0.94 Release is a quite important release for me. This is
first release I worked as Release Manager. Though Samisa told me
what I have to do exactly. I happened to manage things with a
inexperience crew (I myself also a member of that crew:)).
Unfortunately We got our Axis2/c leading developers very busy
those days with PRESTO Conference and Interoperability Meetings.

Last Week we spent very tiresome , late hours together to get 0.94
release out. Though I should not thank people who worked with me
(because this is our duty) I should mention there name at least to
be grateful to them.

Sanjaya the builder, He is the one who took care and tested the
build system for Axis2/c. He put a great effort to give every
option that we asked.

Dumindu, Manjula and Buddhika did the testing for 0.94. And found
number of bugs. Actually we happened to delay the release because
of the bugs they caught at last moment. Dumindu send some useful
patches to INSTALL file and installation guide.

We kept our last few tests rounds very tough. We tests every bits
and pieces that we can. Just to make sure stability of 0.94.

We released Axis2/c 0.94 by 3rd October 2006.

Just After release one of our Java mate Eran Chinthaka. Tried out
it he was impressed about our documentation and mention about some
minor bugs in the documentation.

We are pleased to announce the release of Apache Axis2/C version 0.94.
You can download this release from
http://ws.apache.org/axis2/c/download.cgi

Key Features

1. AXIOM, an XML object model optimized for SOAP 1.1/1.2 Messages. This has complete XML infoset support.
2. Support for one-way messaging (In-Only) and request response messaging (In-Out)
3. Description hierarchy (configuration, service groups, services, operations and messages)
4. Directory based deployment model
5. Archive based deployment model
6. Context hierarchy (corresponding contexts to map to each level of description hierarchy)
7. Raw XML message receiver
8. Module architecture, mechanism to extend the SOAP processing model
9. Module version support
10. Transports supports: HTTP
o Both simple axis server and Apache2 httpd module for server side
o Client transport with ability to enable SSL support
11. Service client and operation client APIs
12. REST support (HTTP POST case)
13. WS-Addressing, both the submission (2004/08) and final (2005/08) versions
14. MTOM/XOP support
15. Code generation tool for stub and skeleton generation for a given WSDL (based on Java tool)
o Axis Data Binding (ADB) support
16. Security module with UsernameToken support
17. REST support (HTTP GET case)
18. Dynamic invocation support (based on XML schema and WSDL implementations)
19. Guththila pull parser support - New
20. WSDL2C code generation tool- with schema code generation (experimental) - New
21. TCP Monitor - C implementation (experimental) - New

Major Changes Since Last Release
1. Guththila pull parser support
2. WSDL2C code generation tool
3. TCP Monitor - C implementation
4. Major Memory leak fixes
5. Fixes to code generation with Java Tool
6. Many Bug Fixes

TODOs Remaining for 1.0
1. Complete API documentation and API improvements
2. Fix further memory leaks
3. Put in place a comprehensive functional test framework

We welcome your early feedback on this implementation.
Thanks for your interest in Axis2C

-- Apache Axis2C Team --

How To Atom-Blogger

2006-07-29T01:04:00.000+05:30

If you are interested in editing Blogger's blogs with Emacs this will be a good reference.
atom-blogger-to-post-with-emacs.

Axis2/Utils Reduces Guththila Memory leaks

2006-07-29T00:45:00.000+05:30

Guththila (Xml Parser) kept a side for a while because it has quite a number of memory leaks. Now I'm struggling get it up and run with Axis2/c. In order to reduce memory leaks , guththila's native stack implementation is replaced with axis2c_utils stack implementation. Then test for memory leaks, It half the memory leaks. Very badly that stack causes large number of memory leaks. That's because while I was writting this (Guththila) didn't care about memory leaks. Now I'm paying for it :D

These days I'm working to get guththila writer up and By the end of August hope to get things finish. Keep eyes open.

Etch troubled me Back to Sarge

2006-07-29T00:32:00.000+05:30

I used to connect Internet via, CDMA phone (Lanka Bell). I was able to connect to internet with Sarge without any problem. Recently I upgraded to Ethch since then It troubling me giving an error.

With Sarge I used 2.6.8 kernel and ti_usb_3410_5052 doesn't come as default module. I happned to compile it and load. But with in Etch 2.6.15 kernel and that module (ti_usb_3410_5052) come as a default module.

I'm not sure weather I have missed some kernel parmeters with etch, but I tried various combinations , like compiled with sources, compil kernel from source. But It didn't work for me. I tried different distributions too.

Ubuntu - 2.6.15

FC5 - 2.6.15

Knoppix 4 - 2.6.12

all of them gave me same error.

usb 1-2: USB disconnect, address 6
usb 1-2: new full speed USB device using uhci_hcd and address 7
ti_usb_3410_5052 1-2:1.0: TI USB 3410 1 port adapter converter detected
usb 1-2: reset full speed USB device using uhci_hcd and address 7
usb 1-2: device firmware changed
ti_usb_3410_5052: probe of 1-2:1.0 failed with error -5
usb 1-2: USB disconnect, address 7
usb 1-2: new full speed USB device using uhci_hcd and address 8
usb 1-2: configuration #1 chosen from 2 choices
ti_usb_3410_5052 1-2:1.0: TI USB 3410 1 port adapter converter detected
ti_usb_3410_5052: probe of 1-2:1.0 failed with error -5

Then I moved back to Sarge and compiled ti_usb_3410_5052 module from source and load it. Now it is work as it's best.

Since I need to try some Etch applicatons , Now I'm running mixed debian versions. with rock solid Sarge kernel. ;)

Emacs For Editing Blog

2006-05-29T01:47:00.000+05:30

I would say simply "Emacs Rocks !!!" , As you can see I was able to
post blog entry from emacs.
atom-blogger is a very useful peice of software

Screen and Elscreen ...

2006-04-09T13:12:00.000+06:00

Screen is quite good and useful application for CLI users. It creates several terminals within one terminal.

$screen emacs

$screen -a

creates screens for 0 and 1. they can be access

C-a 0 and C-a 1 (C-a n also useful )

if you need to look at all screen terminals you can

$C-a " (key strokes doesn't display in the screen but it works)

also you can split terminal horizontally

C-a S

Gives blank screen and C-a 0..9 or whatever screen can be displayed there.

Elscreen .... Rocking Emacs ...

Elscreen seems to be very very useful to emacs users.

As in screen we could create several emacs terminals in one terminals. This is very easy to compared with frames or windows. all screens created displayed in tabbed format.

C-z c create new elscreen window
C-z n Next window

are the most frequent commands (keystrokes) for me in elscreen window.

You want to Edit pdf ???

2006-04-09T12:06:00.000+06:00

I need to edit several pdf files very badly. Today Found that killer app flpsed and Xfig
Now It's very easy to edit PDF in Linux :D

#apt-get install flpsed

convert pdf file into postscript

$pdf2ps your.pdf

Here we go...

$flpsed your.ps

Now you can edit your "ps" file and export it as "pdf" or save it as "ps" then use

$ps2pdf your.ps

Fetchmail with Gnus

2006-04-03T22:58:00.000+06:00

I was able configure fetchmail with gnus

(setq mail-sources '((file :path "/var/mail/dinesh")
(pop :server "cse.mrt.ac.lk"
:user "myusername"
:password "mypassword"
:program "fetchmail -v --all -m '/usr/bin/formail -b >>/var/mail/dinesh'")))

Moved to gnus !

2006-04-02T13:57:00.000+06:00

Moved Mutt->Gnus
Gnus Simply Rocks !!!

Very customizable (few lines of lisp codes), Integrated with EMACS ;)

playing with svn

2006-03-06T11:24:00.000+06:00

 Today started set up a svn for our final year project (BPEL-Mora). I tried to setup a svn server as apache 2 module.In that case svn repository is available to the client through the WebDAV/DeltaV protocol.

Version Contorl with Subversion book (by Ben Collins-Sussman,Brian W. Fitzpatrick & C. Mic\hael Pilato) was very useful to me when I struggle with the svn. The e-version of the book also available for free. I found it on my debian box
                       /usr/share/doc/subversion/book.
Url of the book:   http://svnbook.red-bean.com/

First I installed apache2 using apt-get

#apt-get apache2

then subversion

#apt-get subversion

inorder to setup subversion with apache2 , we need to have mod_dav_svn plugin, In here I tried to use (or used rather) pre-compiled version from the debian repositories because otherwise the process get more complicated.

/**
*If you really need to compile apache2 and subversion you'r self following link might help you. But I *didn't get my dirty with it. :)
*       http://www.linuxjournal.com/article/7655
**/
Now I need to install mod_dav_svn plugin, then tried serveral searches using aptitude. Then found out that libapache2-svn library is to provide mod_dav_svn plugin. Then I installed it.

#apt-get install libapache2-svn

Most interesting part is , when we install pre-compiled package using apt-get or aptitude they edit configaration files accordingly.

When we let to install apache2 to apt-get it install configuration fil\es to the /etc/apache2 , modules /usr/lib/apache2/modules. Most of the time apache2's default location is /usr/local/apache2
In normal installation the we found only httpd.conf for managing htt\pd server's configuration but in here debian manipulate two configuration files namely "apache2.conf" and "httpd.conf".

then as book stated I edited httpd.conf as following

  LoadModule dav_module         /usr/lib/apache2/modules/mod_dav.so
  LoadModule dav_svn_module  /usr/lib/apache2/modules/mod_dav_svn.so

and then restarted httpd server, it said

debian:/etc/apache2# /etc/init.d/apache2 restart
Forcing reload of web server: Apache2[Sun Mar 05 20:21:41 2006] [warn] module dav_module is already loaded, skipping
[Sun Mar 05 20:21:41 2006] [warn] module dav_svn_module is already loaded, skipping
[Sun Mar 05 20:21:42 2006] [warn] module dav_module is already loaded, skipping
[Sun Mar 05 20:21:42 2006] [warn] module dav_svn_module is already loaded, skipping
.
it seems that module already loaded then , I commented out that newly added two lines (little devation from the book).

debian:/etc/apache2# /etc/init.d/apache2 restart
Forcing reload of web server: Apache2.

since my intention to have more repositories in the svn,I added following lines to the apache2.conf
<Location /svn >
DAV svn
# any "/svn/foo" URL will map to a repository /usr/local/svn/foo
SVNParentPath /home/dinesh/svn (absolut path to repository)
</Location >
then created repository using 'svnadmin'

$svnadmin create file:///home/dinesh/svn/repos

then created directory in that repository

$svn mkdir file:///home/dinesh/svn/repos/guththila

  first tried to acces repository using http:// protocole but it didn't work
  when I tried acces repositoy using http:
dinesh@debian:~/tmp$ svn checkout http://127.0.0.1/svn/repos/guththila     project
  svn: PROPFIND request failed on '/svn/repos/guththila'
  svn:
          Could not open the requested SVN filesystem

Then tried to acces this repository using web                  http://127.0.0.1/svn/repos/guththila
     <d:error>
     <c:error>
     <m:human-readable errcode="160029">
     Could not open the requested SVN filesystem
     </m:human-readable>
     </c:error>
     </d:error>
and apache error log in /var/log/apache/error.log said

[Sun Mar 05 20:40:02 2006] [error] [client 127.0.0.1] (20014)Error string not specified yet: Berkeley DB error while opening 'nodes' table for filesystem /home/dinesh/svn/repos/db:\nPermission denied

It seems that there was a problem in permissions. I found out following post

svnforum post
same problem :) .. Then I set permissions of the svn reposotory to the 777

#chmod -R 777 svn

then I was able to acces the repository through the web browser
        http://127.0.0.1/svn/repos/

at one time I came across a database crashing , apache error log

[Sun Mar 05 17:23:51 2006] [error] [client 127.0.0.1] (20014)Error string not specified yet: Berkeley DB error while opening environment for filesystem /home/dinesh/svn/repos/db:\nDB_RUNRECOVERY: Fatal error, run database recovery, referer: http://127.0.0.1/svn/repos/

after seaching on the web found a similler kind of problem it said to goto repository db folder and run db_recovery.

search relusts

$cd ~/svn/repos/db

dinesh@debian:~/svn/repos/db$ db4.2_recover

then it recovered the database.

Now everything works fine but when I tried to commit into the repository
$svn commit -m "test"
svn: Commit failed (details follow):
svn: MKACTIVITY of '/svn/repos/!svn/act/3033bdb6-400e-0410-9aed-b2743e91598e': 500 Internal Server Error (http://localhost)

this happened because of I didn't have authontication method for my svn repository.

http://svn.haxx.se/dev/archive-2003-07/0925.shtml
 http://svn.haxx.se/users/archive-2005-02/0548.shtml
then I entered basic authentication type

# htpasswd -cm /etc/svn-passwd dinesh
New password:
Re-type new password:
Adding password for user dinesh

# htpasswd /etc/svn-passwd -m thilina
New password:
Re-type new password:
Adding password for user thilina

and added following lines to the /etc/apache2.conf
<Location  /svn >
DAV svn
SVNParentPath /usr/local/svn
AuthType Basic
AuthName "Subversion repository"
AuthUserFile /etc/svn-passwd
</ Location >
In this method , the problem is password is transmitted as plain text over the network.

Now I'm able to acces and commit svn repository over the network

Need to configure svn repository to use with ssl. Ill post the steps that I followed to
configure svn with ssl also

PDP

2006-02-28T20:40:00.000+06:00

Today I read some paper on Unix Time sharing system and came across the term PDP-7. So that lead me to dig on PDP's I found some details on PDP's.

Anyway PDP refer's to Programmed Digital Proecessors.

Digital Equipment Corporation (DEC) was founded in 1957, with facilities in an old woolen mill in Maynard Massachusetts.DEC's first computer, the PDP-1, sold for only $120,000 at a time when other computers sold for over $1,000,000.

Everyone (the government and DEC's stockholders included) knew that computers were big and expensive and needed a computer center and a large staff; DEC chose to avoid dealing with these stereotypes by entirely avoiding the term "computer"; thus, for over a decade, all digital computers sold by DEC were called Programmed Data Processors (PDPs).

reconfigure xserver

2006-02-23T22:54:00.000+06:00

When installing Debian most of the time I'm unable to configure VGA to work properly.

So one of my most useful command is

# dpkg-reconfigure xserver-xfree86

/* if you are using xorg this should be `xserver-xorg' */

from there we can give correct driver and high resolution. One important thing is We can select what ever resolution that we want. But It applies applicable highest value from our selection.

Thanks Pradeeper for pointing me towards the `dpkg-reconfigure' sometime back.

http://www.linux.lk/lurker/message/20031023.041514.9984efe2.en.html

Implementing BPEL Mora

2005-12-17T12:48:00.000+06:00

Now a days we are quite busy with our final year project , going to write BPEL engine on top of Axis2. Hope this will rock the WS world.
http://www.cse.mrt.ac.lk/projects/batch02/project10/