我在ubuntu上很新,在我正在运行的终端中的某个时刻：
mortar local:illustrate pigscripts/retail-recsys.pig purchase_input -f params/retail.params
但我有以下错误：
A suitable java installation could not be found. If you already have java installed
please set your JAVA_HOME environment variable before continuing. Otherwise,a
suitable java installation will need to be added to your local system.Installing Java
On OSX run
javacfrom the command line. This will intiate the installation. For
Linux systems please consult the documentation on your relevant package manager.
但我很确定我有Java,所以请问如何设置我的JAVA_HOME环境变量？
