Recently I had the following problem: Wanted to connect to Oracle DB so downloaded the ojdbc14.jar for Oracle Database 10g Release 2 My jdk is jdk1.5.0._09. After I put the oracle driver in JMeter's lib directory the JMeter stopped functioning - I wasn't able to do anything, even closing it. Received only error messages - this feature is not implemented yet. In the jmeter.log I found several exceptions for not found classes. After removing the odbc14.jar the problem disappeared and JMeter continued functioning normally.
So, if somebody had this problem how did you resolve it?
Thanks in advance.