How to run a java class with a jar in the classpath?

Question

So, I can do this very well:

java mypackage.MyClass

if ./mypackage/MyClass.class exists. I can also happily do this:

Answer 1

Try this if you're on Windows:

java -cp .;utilities.jar mypackage.MyClass

Or this if you're on Linux:

java -cp .:utilities.jar mypackage.MyClass

The current directory is not in the CLASSPATH by default when you specify a value for -cp.