javac is not recognized as an internal or external command or operable program

javac is not an internal or external command nor an operable program. Solution: 1. Confirm whether the JDK is installed correctly; 2. Configure environment variables, open the system properties window, click "Advanced System Settings", and click " "Environment Variables" button, find the "Path" variable in "System Variables", click the "Edit" button, and add the JDK installation path at the end of the variable value; 3. Check the JDK installation path; 4. Check the firewall and anti-virus software; 5. , Reinstall JDK.

When we run the javac command on the command line, if the error message "javac is not an internal or external command or an operable program" appears, usually It is because the Java Development Kit (JDK) is not installed or configured correctly. Some possible solutions are described below.

Confirm whether the JDK is installed correctly:

First, check whether the JDK has been installed on the computer. You can enter the java -version command on the command line to verify. If the JDK version information is displayed, it means that the JDK has been installed correctly. If it is not installed, download and install the latest version of JDK.

Configure environment variables:

If the JDK has been installed correctly, but an error message still appears, it may be because the environment variables are not configured correctly. In Windows systems, you can follow the following steps to configure:

Open the system's properties window (right-click "This PC" or "Computer" and select "Properties")

Click "Advanced System" Settings"

Click the "Environment Variables" button

Find the "Path" variable in "System Variables" and click the "Edit" button

Add JDK at the end of the variable value The installation path, for example:;C:\Program Files\Java\jdk1.8.0_221\bin

Click "OK" to close the window

Reopen the command line window and run the javac command again, See if the problem is solved

Check the JDK installation path:

If the environment variables are configured correctly, but an error message still appears, it may be because there is a problem with the JDK installation path . Please confirm whether the JDK installation path is consistent with the path in the environment variable.

Check firewall and anti-virus software:

Sometimes, firewall or anti-virus software blocks the execution of certain programs, including the javac command. Please check the settings of your firewall and anti-virus software to ensure that they do not block the execution of the JDK.

Reinstall the JDK:

If none of the above methods solve the problem, you can consider reinstalling the JDK. First, uninstall the current JDK, then re-download the latest version of the JDK and install it.

Summary:

The above are some common solutions. You can try to troubleshoot the problems one by one to find the cause of "javac is not an internal or external command nor an operable program." Wrong reason. If the problem persists, further investigation and research, or professional help may be required.

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