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Added the java jar file (customer.jar) to C:\Program Files\Java\jdk1.6.0_10\jre\lib\ext directory.

Solved (and without changing anything to the classpath setting).

I have a small java project that imports some classes from a jar file.
import X.Y.Z.*;

Both the java source file (UserInfo.jar) and the jar file (customer.jar) are located in the same directory.

This compiles fine with the sandard javac command:

javac -d . -classpath customer.jar UserInfo.java ...