How to solve javac is not an internal or external command issue

The solution to the problem that javac is not an internal or external command: first check the "JAVA_HOME" configuration; then check the CLASSPATH and modify it; finally check the PATH and add "%JAVA_HOME%\bin".

'JAVAC' is not an internal or external command Solution 1

When the JDK running JAVA is not installed, When executing JAVAC, it will report that 'JAVAC' is not an internal or external command. So let’s first see if the JAVA running JDK is installed on your computer, as shown in the installation directory below.

If it is successfully installed and configured, when executing JAVAC, the following correct message will appear. If it still appears, JAVAC is not an internal or external command, nor is it operable. Program or batch file error, please see method 2. As shown below.

'JAVAC' is not an internal or external command Solution 2

After running JAVAC and reporting JAVAC is not an internal or external command error, Let's run JAVA and see. Haha, running JAVA is correct, then there must be something wrong with the JAVAC configuration. As shown below.

First let’s see if our JAVA_HOME configuration is correct. This JAVA_HOME is not suitable, JAVA_HOME is the jdk installation directory. If it does not match the configuration below, you must write the full path of jdk.

D:\Java\jdk is the path where I installed JDK.

Let’s see if there is any problem with our CLASSPATH. .;%JAVA_HOME%\lib;As shown below.

Note: There is a "." symbol here.

Finally, let’s see if there is any problem with PATH. %JAVA_HOME%\bin; as shown below.

Check your configuration according to my method. If you don’t have it, add it yourself. If you run it, it will not report JAVAC. It is not an internal or external command, nor is it an operable program. Or batch file error message. As shown below.

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