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Message: [QUOTE="vk02720, post: 3697227"] You need to learn - What a package is and how a class can be qualified with a package name (analogous to how a file belongs to a folder) - What classpath is (start with above provided links) - How to add jars to your project's classpath in your IDE or on the command line while compiling and executing. - What jars are already included implicitly in your project (from JRE) If you are working on Windows, open your jar using WinZip and see if your packages and classes are there to make sure you have correct jar files. [/QUOTE]