NoClassDefFoundError

I was wondering what the reason is behind this. I recently installed
the Java 5.0 SDK. Compiling *.java files seems to work fine, but
whenever I try to run something, it gives me that NoClassDefFoundError.
I've seen a solution is to run it as java -classpath . ClassName, but
that's some strange workaround I don't like. Why is this happening? Do
I have to install the SDK in a directory that contains no spaces? By
default it ended up in Program Files\Java.

Thanks,
- Eli

.

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