refactor resource utils a little bit

refactor the ResourceUtils for performance

use daemon threads for thread pools

fix portal spring security config init bug

update docker image version to 0.9.0

version to 0.9.0

use java8 api to replace guava joining List to String

remove useless authentication codes

add more ConfigurationProperties sample

fix the build working directory issue

docker quick start and remove unnecessary files

prefer alpine in docker

fix no 'ps -p' option available when running with alpine