[kepler-dev] Issues in loading a new actor module

Thu May 13 04:19:13 PDT 2010

Dear David Welker,

 There is some development from my side. I deleted the entry of
apple-extention-2.0 and did 'ant run'. (I got this hint from earlier
post). I could able to see the kepler running and also a new module. 
I have checked out 
https://code.kepler-project.org/code/kepler/trunk/modules/multiple-class
-loaders/ and re ran 'ant run' to compile the multiple-class-loaders
module. In my 'build-area' folder i have a 'classloaders.txt' file with
name of the module in it and 'multiple-class-loaders' is the first entry
in the 'module.txt'. Then, i ran 'ant run' but failed. I have attached
the error file for your reference. Is there any restriction in kind of
jar files we try to load for a new module ?

I am equally curious to know why multiple class loaders module is not
included in the 'kepler-2.0.0-RC1-win.exe ?

With thanks and regards
Bala

  _____  

	From: David Welker [mailto:david.v.welker at gmail.com] 
	Sent: 13 May 2010 12:38
	To: AMARNATH, Balachandar
	Cc: Kepler-Dev Developers
	Subject: Re: Issues in loading a new actor module

	Hi, 

	It looks to me that you are using Windows, but that it is trying
to compile Mac OS X only code only. So, this is a separate issue from
having separate class loaders.

	Can you run the following command:

	ant update

	And then see if you can compile?

	On May 13, 2010, at 12:56 AM, AMARNATH, Balachandar wrote:

		Thanks for the hint david welker,

		 Few points, i would like to share at this point about
my work around. First i have installed kepler 2.0 using exe installer
and hence i dont find the module 'multiple class loaders'. I could
checkout from 
https://code.kepler-project.org/code/kepler/trunk/modules/multiple-class
-loaders/ but could not compile ( i dont have build.xml in build-area
folder).

		Then i tried to install kepler using  build system, 

		I ran the following commands,

		1. svn co 
https://code.kepler-project.org/code/kepler/releases/release-branches/bu
ild-area-2.0/ build-area
		2. cd build-area
		3. ant change-to -Dsuite=kepler-2.0
		At the third command, i got an error due to ptolemy and
i downloaded it separately from 
		4. svn co 
https://source.eecs.berkeley.edu/svn/chess/ptII/branches/rel-8-0-beta-2
<https://source.eecs.berkeley.edu/svn/chess/ptII/branches/rel-8-0-beta-2
>  src
		5 Rerun   (3)
		6 ant run
		However, the 'ant run' failed due to the following
error. The complete error trace is attached in the file. 
		I thought., the error was due to one of the module named
apple-extensions-2.0 and hence i replaced this modue with the one coming
with installer (.exe, that contains classes not the sources)
		With this way, i could successfully run 'ant run' and
see the kepler working.

		Now, i went on to create a new module named
'FileProcess' using the following commands
		'ant make-module-suite -Dname=FileProcess'
		and loaded with source code of the actor, and 
		'ant change-to -Dsuite=FileProcess' followed by
		'ant run'. This is failed due to the error and attached
the error file as well

		Can you give me a hint on this, 

		with thanks and regards
		Balachandar

  _____  

			From: David Welker [
mailto:david.v.welker at gmail.com] 
			Sent: 12 May 2010 20:58
			To: AMARNATH, Balachandar
			Cc: Kepler-Dev Developers
			Subject: Re: Issues in loading a new actor
module

			Hi Balachandar,

			It sounds as though you need to use a separate
class loader for your module, at least for now. If it was not so close
to the time for the release, I would look into discussing with the
appropriate maintainers of those modules the possibility of upgrading
the jars to the versions you need.

			First, lets look at what you did and understand
why it didn't work. When your module is in the HIGHER PRIORITY position
(above the other modules in modules.txt) your jars are used for
EVERYTHING at run time. If the jars are compatible, this doesn't matter.
But in this case, the jars are not compatible, and you are breaking
existing functionality. When you put your module in the LOWER PRIORITY
position (below the other modules in modules.txt), then the jars
provided by the system are used for EVERYTHING at run time. Which means
you do not get the additional functionality you expect from the new jars
you have added.

			So, here is the solution. You need to use a
separate class loader, and explained in the build system instructions.
In this email to me, you say that you put the actor name in
classloaders.txt. But you need to put the MODULE name, not the actor
name in that file. You also have to put the module
"multiple-class-loaders" in the highest priority position in the suite
you are developing. This is described in the build system instruction
here:

https://kepler-project.org/developers/teams/build/documentation/build-sy
stem-instructions#using-a-separate-class

			So, can you try this? If it doesn't work, let me
know and we will look more deeply into this.

			-David

			On May 12, 2010, at 5:01 AM, AMARNATH,
Balachandar wrote:

				Dear David Welker 

				My issue is straight forward that is it
possible to have separate set of jar files to be loaded for my module ?
Can I get some example solution ?

				I have wrote a new actor using kepler
2.0 that uses the following jar file 'castor-1.0.jar and
jsch-0.1.37.jar'. However, when i run the actor from the workflow
canvas, it is not functioning as i exepected and i found that is due to
the conflicts of similar jars 'castor-0.95.jar' and jsch-0.1.31' present
in the module 'actors-2.0 and ssh-2.0' respectively. 

				I tried to load my actor module ahead of
'actors-2.0' and 'ssh-2.0' by editing modules.txt in build-area folder.
This fixed the issue but right clicking over the actor is not
functioning ..!!!. 

				I have also tried to create a text file
callled 'environment.txt' in module-info folder of my actor which i
specified the CLASSPATH and its values, didnt work 

				I also created a text filed
classloaders.txt in build-area specifying my actor name in it so that
kepler understands this actor requires a separate class loader. Didnt
work. 

				Can you help me out to come of this
issue, I have also posted this to forum :) 

				with thanks and regards 
				Balachandar 

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