ClassNotFoundException for Apache Derby database

I am trying to use Apache Derby in Network mode for my J2EE Web App using Eclipse I am getting the following error:

ClassNotFoundException: org.apache.derby.jdbc.ClientDriver
SQLException: S开发者_运维知识库QLState: 08001

I have already added the derbyclient.jar and derby.jar in classpath variable of system and the project. I cannot figure out the problem

You must add derbyclient.jar to YourProject\WebContent\WEB-INF\lib. Not needed to add derby.jar to classpath.

It's helped me.