MacOS X 10.10+ .plist to make Java work in an IPv6-only+NAT64/DNS64 environment

java_tool_options.startup.plist

<?xml version="1.0" encoding="UTF-8"?>
<!-- Save the contents of this file as ~/Library/LaunchAgents/java_tool_options.startup.plist -->
<!-- Log off and on afterwards, wait until the plist is loaded. Run a program, get its pid and -->
<!-- check using `ps eww -o command <pid> | tr ' ' '\n' | grep -i java` that the system-wide environment variable is set -->
<!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>java_tool_options.startup</string>
  <key>ProgramArguments</key>
  <array>
    <string>sh</string>
    <string>-c</string>
    <string>launchctl setenv JAVA_TOOL_OPTIONS -Djava.net.preferIPv6Addresses=true -Djava.net.preferIPv4Stack=false</string>
  </array>
  <key>RunAtLoad</key>
  <true/>
</dict>
</plist>