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~/NetBeansProjects/jruby $ jruby -e "require 'java'; module Foo; include_package 'org.jruby.util'; end; p defined? Foo::PackageSearch"
nil
~/NetBeansProjects/jruby $ jruby -e "require 'java'; module Foo; import 'org.jruby.util'; end; p defined? Foo::PackageSearch"
"constant"