def java = { instance, java_name, java_home ->

def descriptor = instance.getDescriptor("hudson.model.JDK")

if (descriptor.getInstallations()) {

println "Skipping ${java_name} tool"

} else {

def jdk = new hudson.model.JDK(java_name, java_home)

descriptor.setInstallations(jdk)

println "Adding ${java_name} tool"

}

}