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PhilArmstrong:
The compile warnings are given because the code is using ArrayList without generics, and you are compiling using a compiler/library set which supports generics. This is quite common and is generally not a problem. Google the note's message text for more information.
To make the warnings go away, you can compile using the -Xlint:unchecked option, or modify the source code to use generics.
The code included with Java DB does not use generics because it is supposed to work on J2SE 1.4.2 as well as newer versions. J2SE 1.4.2 does not support generics.
Secondly, ClassNotFoundExceptions are always caused by CLASSPATH issues. For a description of how to set up and test your classpath for SimpleApp, see SimpleApp's documentation, at <installdir>/demo/programs/simple/example.html.
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