in vars/slingOsgiBundleBuild.groovy [138:143]
def jenkinsJdkLabel(int jdkVersion, def globalConfig) {
def label = globalConfig.availableJDKs[jdkVersion]
if ( !label )
error("Unknown JDK version ${jdkVersion}. Available JDKs: ${globalConfig.availableJDKs}")
return label
}