Use external libraries in web dynpro java

Dear Experts,
I need to add an external library to my project.
Anyway, I do not know how to do it because it gives me many problems.
I tried modifying the classpath and placing it in the lib folder of the project from "Navigator".
Also project properties, add. jar outside, and throws me the following error:
[javac] Compiling 213 source files to D:\WORK\WORKSPACE\7.2.jdi\LocalDevelopment\t\2BF09F48E6D0E2C201262098A0E4D79F\classes
     [javac] ERROR: D:\WORK\WORKSPACE\7.2.jdi\LocalDevelopment\t\2BF09F48E6D0E2C201262098A0E4D79F\gen_wdp\packages\elsys\com\.....\wd\comp\....\MainView.java:34: package com.estaf does not exist
     [javac] ERROR: import com.estaf.jpay;
     [javac] ERROR:
Given these errors, I know my includes without problems and I can instantiate objects from library classes, but these errors I can not deploy.
I read the following link:
/people/raphael.vogel/blog/2008/05/05/how-to-use-external-libraries-in-the-sap-component-model-part-ii
I did everything the tutorial. I created the external library. I can see in my project "DC-Definition -> Used DCs" The public parts assembly and compilation. Now the problem is that it still does not recognize the classes of the libraries you want to use.
A level of code, when I try to instantiate the class does not recognize me. What could be missing? I did a couple of times step by step and gives me the same results.
I use SAP NetWeaver Developer Studio SAP NetWeaver 7.2 SP03 PAT0007 version.
Infinitely appreciate any help. Thank you very much.
Rasim
Edited by: Rasim Donmez on Apr 11, 2011 4:50 PM
Edited by: Rasim Donmez on Apr 11, 2011 4:51 PM

Hi,
please find below path for adding External Jar files.
right click on the webdynpro dc and select the properties .
then clcik on Java Build path->select libraries->select External External Jars.
after that just rebuild your project (not Build).
Regards,
Govindu
Edited by: Govindu Nagotla on Apr 12, 2011 2:28 PM

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/people/valery.silaev/blog/2005/09/14/a-bit-of-impractical-scripting-for-web-dynpro and some other messages in the forums. However, it isn't working exactly as described in the blog. I have to twist it a bit to get it work. I were wondering if anyone has any better solution for this problem?
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- Step 3: Create WD DC wd1, add used DCs and WD reference libraries as described in the blog. Add WD components as public part. Build and deploy WD DC wd1.
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Van
Edited by: Van Hai Ho on Dec 18, 2007 3:30 PM
Edited by: Van Hai Ho on Dec 18, 2007 3:31 PM

Hi Pascal,
Thank you so much for your help. Your suggestion has helped to make my life a lot easier.
Regards,
Van

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we're stuck here.
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We read every single forum and blog entry we could find on this topic.
E.g.: /people/valery.silaev/blog/2005/09/14/a-bit-of-impractical-scripting-for-web-dynpro
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hi
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Hi,
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Part II --> Part-II: Print Web Dynpro Java applications using JasperReports
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Hi,
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/people/william.cui/blog/2007/02/12/sharing-session-context-between-parent-and-external-windows-running-on-same-host
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Use external libraries in web dynpro java

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