Fixing the "JAVA_HOME is not set" Error: A Complete Guide Encountering the error ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH is a common hurdle for developers. This error means your system can't find a Java Development Kit (JDK), which is essential for running tools like Gradle for Android development. This guide will walk you through checking for a JDK, installing one if needed, and correctly setting the JAVA_HOME environment variable on Windows, macOS, and Linux. 1. Check if Java is Installed First, verify if Java is already on your system but not properly configured. Open a Command Prompt (Windows) or Terminal (macOS/Linux). Run the following commands: echo %JAVA_HOME% java -version If these commands return a version number, Java is installed. If you get an error like command not found , you need to install a JDK. 2. Install a JDK (If Needed) If you don't have a JDK, you need to install ...