macOS shell: JAVA_HOME is empty inside script - bash

Question

I have macOS 10.11.6. The JAVA_HOME is set in the .bash_profile as
export JAVA_HOME=$(/usr/libexec/java_home -v 1.8)
export PATH=$JAVA_HOME/bin:$PATH
From command line, I can see it
>echo $JAVA_HOME
/Library/Java/JavaVirtualMachines/jdk1.8.0_73.jdk/Contents/Home
But, the JAVA_HOME is empty, when I run the following script
#!/bin/sh
SHELL=/bin/sh
export SHELL
echo $JAVA_HOME
if [ -n "$JAVA_HOME" ]; then
#do something
else
echo JAVA_HOME is empty
fi
Even if I use #!/bin/bash in my script, the JAVA_HOME is still empty.

Answer 1

TL;DR
Depending on how you run your scripts, you may need to put your exports into ~/.bashrc for interative shells, or directly into your script or crontab so that it doesn't rely on exports from your user's shell.
Bash Startup Files
Simplistically, the ~/.bash_profile script is sourced for login shells (e.g. /bin/bash -l), while the ~/.bashrc file is sourced for interactive shell (e.g. /bin/bash -i). It's actually a bit more complicated than that, but the above should get you pointed in the right direction.
See Also
https://www.gnu.org/software/bash/manual/html_node/Invoking-Bash.html#Invoking-Bash
https://www.freebsd.org/cgi/man.cgi?query=bash#INVOCATION
man 1 bash

Answer 2

I configure mine like this:
# configure Java http://www.jenv.be/
# install Java: brew cask install java, brew cask install java7
# set global default: setJavaGlobal 1.7, jenv global 1.7
# set local folder default: jenv local 1.8
#
JENV_HOME=$HOME/.jenv
export PATH=.:$PATH:$JENV_HOME/bin
eval "$(jenv init -)"
export JAVA_HOME="$HOME/.jenv/versions/`jenv version-name`"
alias jenv_set_java_home='export JAVA_HOME="$HOME/.jenv/versions/`jenv version-name`"'
And some related shell methods I use in my .bash_profile :
setJavaGlobal() {
jenv global $1;
jenv_set_java_home
echoJavaSetup
}
setJavaLocal() {
jenv local $1;
jenv_set_java_home
echoJavaSetup
}
echoJavaSetup() {
echo --------------------
echo NEW JAVA SETUP:
echo " PATH: $PATH"
export JAVA_VERSION=`java -version 2>&1 >/dev/null | grep 'java version' | awk '{print $3}'`
echo " JAVA: $JAVA_VERSION, $JAVA_HOME"
jenv versions
echo --------------------
}
removeJavaLocal() {
rm -rf ./.java-version
}
showJava() {
echo --------------------
echo EXISTING JAVA SETUP:
echo " PATH: $PATH"
export JAVA_VERSION=`java -version 2>&1 >/dev/null | grep 'java version' | awk '{print $3}'`
echo " JAVA: $JAVA_VERSION, $JAVA_HOME"
jenv versions
if [ -f ./.java-version ]; then
echo "Using Java LOCAL DEFAULT. Not using global default! Run command 'removeJavaLocal' to change to global default."
fi
echo --------------------
}