> To me also the error is originated form somewhere earlier than JB.
> Unforunately I have a problem with logging of JB. I have a
> log4j.properties file in WEB-INF/classes and put the following line
> in it: log4j.logger.org.firebirdsql=DEBUG
> as recommended by Faq. But no logging of jdbc driver occured :-(
> What do I wrong? I have WEB-INF/log4j-1.2.7.jar.

Did you specify -DFBLog4j=true during JVM startup? See third sentense
of JayBird FAQ on
http://jaybirdwiki.firebirdsql.org/FAQ/JayBirdLogging

Roman