GRAILS-6596 - improve jar manifest handling
GRAILS-6596 - improve jar manifest handling

clockworkorange/grails-core,clockworkorange/grails-core,clockworkorange/grails-core,erdi/grails-core,clockworkorange/grails-core,erdi/grails-core,erdi/grails-core,clockworkorange/grails-core