Groovy-classloader: class in same .groovy file not found when used within a package

the following code is in a subdir 'business' of a dir that's on the classpath

package business

class Vendor {
public String name
public String product
public Address address = new Address()
}
class Address {
public String street, town, state
public int zip
}

calling code:

import business.*
new Vendor()

error message:

java.lang.NoClassDefFoundError: Address
at business.Vendor.class$(Vendor.groovy)
at business.Vendor.<init>(Vendor.groovy:6)

This code has worked since June 26th 2005