Looks to me like your servlet is not finding the needed driver for the database connection. Are you sure the correct jar is in yyour library directory? Are you using database connection pooling? If you could post the code from your servlet I could try and help more.
On a side note, the "javax.servlet.ServletException: Servlet.init() for servlet CPlanSer1 threw exception" line worries me. Are you establishing a database connection in the init method of your servlet? This in itself has some inherent problems with design. We can discuss those after we figure out what is wrong with the connection.
“Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.” - Rich Cook