Setting up jsse.jar in weblogic preclasspath

Hi
We have a service layer that talks to LDAP for sign on. We use JSSE to enable secure Internet communications. The service layer that is the EJB is deployed on weblogic. the jsse.jar is included in the ear with the manifest file denoting the proper path inside the ear. However, at runtime, when the bean tries to communicate to LDAP on SSL port using the trust store certificate, i get following error:

javax.naming.CommunicationException: <ldap_LDAP_machine>:636. Root exception is
java.io.IOException: Write Channel Closed, possible SSL handshaking or trust failure

When i include the jsse.jar in PRE_CLASSPATH variable in weblogic's startup script (startweblogic.bat) , the error is gone!

i do not understand why? is it the problem of jsse.jar, that it has to be loaded by system class loader and not ear class loader? or is it a bug???