How to set classpath for classes in war files

Hi All,
After deploying the WAR file I could access the JSP files but gives classnotfound exception when the information is expected from the java servlet.DO I need to set the classpath if yes how to do for the war file.
thanks

The web.xml,file structure and error is below let me know if more information is required.
As you said weblogic is looking for the classes in lib directory inspite of having the classes in web-inf/classes directory.
web-app>
<servlet>
<servlet-name>ControllerServlet</servlet-name>
<servlet-class>com.test.site.pds.Controller</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ControllerServlet</servlet-name>
<url-pattern>/controller</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
</web-app>
File Structure:
C:\test\PDSWebApp\WEB-INF\classes\com\test\site\pds\*.class
PDSWebApp
     css
     html
     images
     javascript
     jsp
     WEB-INF
     classes
     com/test/site/pds/*.java
     lib
     servlets
The error:
javax.servlet.ServletException: [HTTP:101249][ServletContext(id=18129862,name=PdsApp,context-path=/PdsApp)]: Servlet class com.test.site.pds.Controller for servlet ControllerServlet could not be loaded because the requested class was not found in the classpath C:\bea\user_projects\domains\mydomain\myserver\.wlnotdelete\extract\myserver_PDSAPP_PdsApp\PdsApp.war;C:\bea\user_projects\domains\mydomain\.\myserver\.wlnotdelete\extract\myserver_PDSAPP_PdsApp\jarfiles\WEB-INF\lib\classes12.jar;C:\bea\user_projects\domains\mydomain\.\myserver\.wlnotdelete\extract\myserver_PDSAPP_PdsApp\jarfiles\WEB-INF\lib\commons-beanutils.jar;C:\bea\user_projects\domains\mydomain\.\myserver\.wlnotdelete\extract\myserver_PDSAPP_PdsApp\jarfiles\WEB-INF\lib\commons-collections-2.1.1.jar;C:\bea\user_projects\domains\mydomain\.\myserver\.wlnotdelete\extract\myserver_PDSAPP_PdsApp\jarfiles\WEB-INF\lib\commons-lang-2.0.jar;C:\bea\user_projects\domains\mydomain\.\myserver\.wlnotdelete\extract\myserver_PDSAPP_PdsApp\jarfiles\WEB-INF\lib\displaytag-1.0.jar;C:\bea\user_projects\domains\mydomain\.\myserver\.wlnotdelete\extract\myserver_PDSAPP_PdsApp\jarfiles\WEB-INF\lib\jstl.jar;C:\bea\user_projects\domains\mydomain\.\myserver\.wlnotdelete\extract\myserver_PDSAPP_PdsApp\jarfiles\WEB-INF\lib\standard.jar;C:\bea\user_projects\domains\mydomain\.\myserver\.wlnotdelete\extract\myserver_PDSAPP_PdsApp\jarfiles\_wl_cls_gen.jar;C:\bea\user_projects\domains\mydomain\.\myserver\.wlnotdelete\extract\myserver_PDSAPP_PdsApp.
java.lang.ClassNotFoundException: com.test.site.pds.Controller.

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