Empty JAR File : After deployment of PAR file.

Hi friends,
I Migrated the EP Database to different machine and made neccessary changes in the portal to make it point to the new database.
Then i tried to change the custom deployed applications to make it point to new database. so Got the somecomp.par.bak from /<Portal_installation_path>/cluster/server/services/
servlet_jsp/work/jspTemp/irj/root/WEB-INF/deployment/pcd. Imported it into Eclipse, changed connection properties code, built it and coverted to par file. Deployed that file into portal using java developement tab. Even after uploading a new par, application is still pointing to old database.
While deploying, it wrote some log into error_log file as follows:
Jan 13, 2006 9:43:38 AM ...rtal.prt.service.config.ConfigDeploymentService [Client_Thread_14] Warning": An upload sequence w
ill start now. Please do not stop the server or serious deployment issues may arise.
Jan 13, 2006 9:43:39 AM ...rtal.prt.service.config.ConfigDeploymentService [Client_Thread_14] Warning": The upload sequence
is now complete, all the upgrades have been performed.
warning: Jar is empty: /usr/sap/AAA/j2ee/j2ee_00/cluster/server/services/servlet_jsp/work/jspTemp/irj/root/WEB-INF/portal/po
rtalapps/SOMECOMP/private/lib/SOMECOMPcore.jar
What may be the cause of this error?
Portal Version:
EP6 SP2 Patch 29
SAPJ2EE 6.20 Patch 29
Regards,
Nilz
Message was edited by: nilz

Hi Nilz,
> I got confused here
Don't!
In NWDS, if you import a PAR, no JARs which are inside the PAR get imported. That's all (it's enough ).
> The one using which i compiled my code
> like htmlb.jar etc
NO! These are (hopefully) not inside your own PAR but only referenced!!!
> When i imported a PAR file, the source code was there.
Then even with NWDS you shouldn't have any problems as the classes / JARs are compiled/created at PAR creation.
> i am using Eclipse with SP2 plugins
Alltogether in your situation you are not confronted with an error but with a warnung. Obviously you don't have any code in the src.core section.
Hope it helps
Detlev
PS: Please consider rewarding points for helpful answers on SDN. Thanks in advance!

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" <?xml version="1.0" encoding="iso-8859-1" ?>
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<property name="ClassLoadingPolicy" value="5.0" />
<property name="DeploymentPolicy" value="5.0" />
<property name="AuthenticationPolicy" value="5.0" />
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<components />
<services />
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INFO: Detected Portal Archive File: com.sap.portal.appintegrator.sap.parINFO: Application successfully stored in the PCD
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2006-11-21_10-22-16
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************please reward points if the information is helpful to you************

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I found an answer to my own questions.
I'm posting what I found to answer my questions so that anyone with a similar question looking here will have an answer.
The following Oracle link appears to explain everything about deployment that a developer needs to know!
http://docs.oracle.com/javase/8/docs/technotes/guides/deploy/
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