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A lot of programs that make use of the Java Runtime include it in their installation packages.īecause there are very few reasons why you’ll need the Java Development Kit (JDK) if you’re not interested in Java Development, you might have believed that Javac was already installed by JRE, but the truth is you’ll need to install the whole Java Development Kit. The JRE is part of the JDK, but most of the time is downloaded separately. One of the main reasons why this error occurs is because users that are just starting to learn Java are confusing the Java Runtime Environment (JRE) with the Java Development Kit (JDK). Step 1: Installing the Java Development Kit (JDK) If this is the case, you will need to set the path manually. The path to Javac is not set or is incorrectly set – In order to compile from Command Prompt and to make sure that other app server tools function properly, the system needs to be aware of the location of Javac.The Java Development Kit (JDK) is missing from the machine – This typically happens because the user mistakenly assumes that the Java Compiler (javac) is installed along with the Java Runtime Environment.The “ Javac is not recognized as an internal or external command” error is encountered when the Command Prompt is unable to find the Java PATH variable. What causes the Javac is not recognized error