Servlet error: java.lang.NoClassDefFoundError

We have created OC4J instance on application server.
Deployed single application (ear) consisting of one ejb module and one web module.
We have deployed the application using OEM, it is installed successfully.
When we try to access the action class following error is displayed,
Servlet error:
java.lang.NoClassDefFoundError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:219)
at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.0.0)].server.http.HttpApplication.loadServlet(HttpApplication.java:2028)
This problem does not occur always.
We have been able to successfully deploy the same ear file on some ocassion.
OS used: Linux Advanced server 2.1
Application server: 10g (9.0.4)

Hi, here is my CLASSPATH setting,
CLASSPATH=d:\ptc\Windchill\codebase;d:\ptc\Windchill\codebase\WEB-INF\lib\ie.jar;d:\ptc\Windchill\codebase\WEB-INF\lib\JGL.jar;d:\ptc\Windchill\codebase\WEB-INF\lib\xerces.jar;d:\ptc\Windchill\codebase\WEB-INF\lib\saxon.jar;d:\ptc\Windchill\codebase\WEB-INF\lib\xalan.jar;d:\ptc\Windchill\codebase\WEB-INF\lib\mail.jar;d:\ptc\Windchill\codebase\WEB-INF\lib\activation.jar;d:\ptc\Windchill\codebase\WEB-INF\lib\soap.jar;d:\ptc\Windchill\codebase\WEB-INF\lib\jnilib
the wt.content package is packed into the wt.jar, and the wt.jar is in the d:\ptc\Windchill\codebase directory.

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