If you're using Windows, you may already have a JRE installed, but upgrading usually won't hurt.If you aren't planning to use Eclipse for Java development and want to save some disk space, install a JRE. If you intend to use Eclipse for Java development, then you should install a JDK. You may either install a Java Runtime Environment (JRE), or a Java Development Kit (JDK), depending on what you want to do with Eclipse. Regardless of your operating system, you will need to install some Java virtual machine (JVM). In all cases, Eclipse requires a 64-bit JVMĪ Java Development Kit (JDK) includes many useful extras for Java developers including the source code for the standard Java libraries. If you are using Eclipse to do Java development, or are on macOS, install a JDK. In summary, if you are trying to figure out where JAVA_HOME is on your Mac OS X system, I hope this has been helpful.Current releases of Eclipse require Java 17 JRE/JDK or newer. You might also be able to find some of these settings in the Mac OS X Control Panel, but I looked just now, and did not see them (though you can see Java's "temporary internet files" from that console). If you have XCode installed you can now find the JAVA_HOME directory with this command: I have no way of verifying this any more, but on Mac OS X 10.5, 10.6, and 10.7, I'm pretty sure this is where the JDK JAVA_HOME was located: Library/Internet\ Plug-Ins/ugin/Contents/Home/bin/java -version Older Mac OS X systems This is confirmed by this Oracle Java/JRE documentation page, which shows that you can demonstrate this by running this command in the Mac Terminal: Library/Internet Plug-Ins/ugin/Contents/Home If you've installed the Oracle JRE (as opposed to the JDK), JAVA_HOME for it appears to be located here instead:
Of course that will vary by the JDK version you have installed. Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home/
Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home This has changed over time, but if you're using Mac OS X 10.9 or newer (now macOS), your JDK/SDK JAVA_HOME location for Java 8 will be something like this: Java/Mac FAQ: Where is JAVA_HOME located on Mac OS X (macOS) systems? macOS JDK location
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