it can almost be everything, the description of your problem is insufficient. Is it a portlet application or a pure web app (I asume portlets, because you are posting in this forum)? If portlets, which environment? Can you provide at least a stack trace?
I guess it is a configuration error with missing or inappropriate libraries (just from the NoSuchMethodException).
Greetings from Hamburg, Stefan
Author of German LDAP-Book
Committer at Apache Directory Project