Getting exception while trying to connect mysql database

Question

hi
i am using mysql as database while connecting to database using jsp i am getting the following exception
"java.lang.ClassNotFoundException:com.mysql.jdbc.Dr iver"
can any one tell wha tis the actual problem
regards

Answer 1

If you've tens of applications on the server which
makes use of the same driver/JAR, then you can put
this JAR in the classpath of the server to save
WAR/EAR space. And about differing versions: I am not
used to do so. Otherwise just put the different/older
version in the classpath of the webapp and then give
it higher priority in the classloader.If you are using Enterprise Applications, disk space for the code should be your last concern. If you don't have enough of that for each of the applications to have their own space for the third party jars that they use, then you need a new server, as the one you have is not going to be able to handle the load anyway.
And as far as fiddling around with the classpath to avoid jarfile "collision" or incapability, good luck. The first time you add a new application all the others will stop working and you will have to spend two days reordering the classpath properly, so that they all work again. I know, because I have seen it happen, even though I suggested to them to do it the other way, they insisted on doing things the way you suggested and, like I said, as soon as they added the next application, the server was down for two days, until they got all of the classpath/(classloader priority) issues straightened out.