IntelliJ IDEA: pass JAVA_HOME, M2_HOME, MAVEN_OPTS to the IDE using Yosemite

Place the following content (enhance it to your taste obviously) to /Library/LaunchDaemons/setenv.MAVEN_OPTS.plist:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
  <plist version="1.0">
  <dict>
  <key>Label</key>
  <string>setenv.BAR</string>
  <key>ProgramArguments</key>
  <array>
    <string>/bin/launchctl</string>
    <string>setenv</string>
    <string>MAVEN_OPTS</string>
    <string>-XX:PermSize=500m -XX:MaxPermSize=800m -Xmx2g -Djavax.net.ssl.keyStore=/Users/doma/.keystore -Djavax.net.ssl.keyStorePassword=password -Djavax.net.ssl.trustStore=/Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home/jre/lib/security/cacerts -Djavax.net.ssl.trustStorePassword=changeit</string>
  </array>
  <key>RunAtLoad</key>
  <true/>
  <key>ServiceIPC</key>
  <false/>
</dict>
</plist>

You'll have to either restart your computer or run the following line to apply the changes:

launchctl load -w /Library/LaunchDaemons/setenv.MAVEN_OPTS.plist

The next candidate is M2_HOME, the file to create is /Library/LaunchDaemons/setenv.M2_HOME.plist :

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
  <plist version="1.0">
  <dict>
  <key>Label</key>
  <string>setenv.BAR</string>
  <key>ProgramArguments</key>
  <array>
    <string>/bin/launchctl</string>
    <string>setenv</string>
    <string>M2_HOME</string>
    <string>/opt/local/share/java/apache-maven-3.1.1</string>
  </array>
  <key>RunAtLoad</key>
  <true/>
  <key>ServiceIPC</key>
  <false/>
</dict>
</plist>

Again, restart or run the following to apply:

launchctl load -w /Library/LaunchDaemons/setenv.M2_HOME.plist

...and here's the proof that you don't have to set the value of the M2_HOME after each Maven project import:

Reference: http://www.dowdandassociates.com/blog/content/howto-set-an-environment-variable-in-mac-os-x-launchd-plist/