install grails

先安装依赖的java，然后再安装grails

apt-get install openjdk-7-jdk
apt-get install software-properties-common
add-apt-repository ppa:webupd8team/java
apt-get update
apt-get install oracle-java8-installer
apt-get install oracle-java8-set-default

java -version

apt-get install curl
curl -s get.sdkman.io | bash
source "$HOME/.sdkman/bin/sdkman-init.sh"
sdk install grails
grails -version

install grails