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How to Fix 'javac' is not recognized as an internal or external command in Windows and Linux? Example

Hello guys, if you are trying to compile your Java source file and getting "'javac' is not recognized as an internal or external command" in Windows or Linux machine like Windows 10 or Redhat 8 but not sure what to do then you have come to the right place. This is a common Java related error and can occur to an operating system like Windows, Mac or Linux if java is not installed properly like only JRE is installed and JDK is not installed or javac is not added on PATH environment variable. In this article, I will explain what this error is and how you can fix it by following step by step guide I share, but if you still cannot solve this problem on your own then just ask for help in comments. But don't forget to check your PATH environment variable because that's where JDK/bin directory needs to be present, which contains all Java related commands including "javac" and "java" which are used to compile and run Java applications.

If this is your first Java program or HelloWorld then I suggest going through How to compile and run HelloWorld in Java because that explains what do you need before you compile and run any Java program. 

If you have already crossed that level and knows about How to set PATH in Java then there is something wrong while setting PATH in Java. Anyway let's see when do you get this error and from where does 'javac' is not recognized as an internal or external command comes.

This is a standard error in the Windows command line and Linux when you type a command which is not available in System PATH, here javac command which is used to compile Java source file and produces class files are not in PATH. Best way to verify this is by executing the following command :

# echo %PATH%

If you see your JDK installation folder or JAVA_HOME in PATH and included bin directory which contains all java binaries including javac and java commands which are used to compile and run Java program. 

Most likely your PATH may not have JDK/bin in PATH if that's the case just include the bin folder of JDK in your PATH. See how to set PATH for Java in Windows for step by step guide.




Cause of 'javac' is not recognized as an internal or external command in Windows 10 and Linux

Another cause of  " javac is not recognized as an internal or external command " could be that you only have JRE in your System and not JDK, which means you can only run already compiled Java programs and can not compile Java programs because JRE doesn't contain javac in their bin folder. To know more about JRE and JDK, see the difference between JRE and JDK. In this case, you need to download and install Java in your System. You can download the current version of Java from Oracle's site.

Another possible reason for " javac is not recognized as an internal or external command "  is setting PATH with an incorrect directory e.g. path may not contain forward slash or missed something. 

Here is how this error looks like in Windows command prompt

How to Fix 'javac' is not recognized as an internal or external command in Windows and Linux? Example


The best way to verify this is just to copy the path of JDK from the PATH variable and execute in the command line if you can not get into that directory which means the path to the JDK installation folder is incorrect. 

In this case, go to the bin directory of the JDK installation directory and copy its address from the address bar and add it into PATH to make this work.



Cause of 'javac' is not recognized as an internal or external command  fix solutionSo the root cause of  "javac is not recognized as an internal or external command " is that system is not able to find the javac command from its PATH. just double check PATH and add the bin folder of the JDK installation directory in the path, if not included already. Remember to close and reopen the command prompt once you make this change, this will fix the " javac is not recognized as an internal or external command " error.

That's all about how to fix this "javac is not recognized as an internal or external command " error in any operating system from Windows to Mac. Just follow the steps as its PATH related issue which is general concept across all the operating system. 

You should also see if you have declared JAVA_HOME environment variable which points to JDK installation directory. It's a common practice that many people add JAVA_HOME/bin into PATH but they forget to declare JAVA_HOME environment variable, in that case entry in PATH becomes invalid and System not able to find the javac or other java related command. 

If you see JAVA_HOME in your PATH then please make sure that JAVA_HOME is declared properly and point to right JDK installation to avoid this and other Java Path related issues.


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5 comments :

Anonymous said...

Hello, I am not able to compile Java program using command program. whenever I am trying to compile by typing javac MyClass.java, I am getting following error :
javac' is not recognized as an internal or external command, operable program or batch file.

I have already checked my PATH environment variable and JDK directory is included in my PATH and CLASSPATH, pleaes help.

Unknown said...

If you receive this error, Windows cannot find the compiler (javac).

Here's one way to tell Windows where to find javac. Suppose you installed the JDK in C:\jdk1.8.0. At the prompt you would type the following command and press Enter:

C:\jdk1.8.0\bin\javac HelloWorldApp.java
If you choose this option, you'll have to precede your javac and java commands with C:\jdk1.8.0\bin\ each time you compile or run a program. To avoid this extra typing, consult the lecture "Creating a Hello World application" in this page.
http://learnjavaeasy.com/course/learn-java-online-with-java-8-by-examples/

Class names, 'HelloWorld', are only accepted if annotation processing is explicitly requested

If you receive this error, you forgot to include the .java suffix when compiling the program. Remember, the command is javac HelloWorld.java not javac HelloWorld.

Anonymous said...

SET PATH
C:\jdk1.8.0\bin\javac HelloWorldApp.java

Unknown said...

I have this issue, I am using intellij,which is where I receive the error, but in my command prompt it works just fine

javin paul said...

try to add JDK/Bin in your PATH, if you are behind corporate proxy, add PATH in your user system variables

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