Assuming you use bash shell and installed Java with the Oracle installer, you could add the following to your .bash_profile

export JAVA_HOME=$(/usr/libexec/java_home)
export PATH=$JAVA_HOME/jre/bin:$PATH

This would pick the correct JAVA_HOME as defined by the Oracle installer and will set it first in your $PATH making sure it is found.
Also, you don’t need to change it later when updating Java.

From：https://stackoverflow.com/questions/27319495/error-java-home-is-not-defined-correctly-executing-maven