I'm trying to use javac with the windows command prompt, but it's not working. After adding the directory 'C:Program FilesJavajdk1.6.016bin' to the end of the PATH environment variable, the. When you try to run your java program you first open your command window and run this command (javac yourProgram.java) to compile it first. But you get this.
When you try to run your java program you first open your command window and run this command (javac yourProgram.java) to compile it first. But you get this error message says: ('javac' is not. Nov 22, 2012 My javac command is not working. 'javac is not recognized as an internal or external command, operable program or batch file.' -java version WORKS I've tried setting classpath successfully in. That highly depends on the exact behaviour javac is showing. The most common problem is that it cannot be found in the file system. I assume you are using Windows.
Active11 months ago
I am experiencing an error while trying to compile Java programs.
I am on Windows (this is a Windows-specific problem) and I have the latest JDK installed.
I have attempted a solution involving the
PATH variable, but the error persists.
Console output:
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closed as off-topic by Jason C, animuson♦Mar 29 '14 at 16:21
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6 Answers
For experienced readers:
Welcome!
You have encountered one of the most notorious technical issues facing Java beginners: the
'xyz' is not recognized as an internal or external command.. error message.
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In a nutshell, you have not installed Java correctly. Finalizing the installation of Java on Windows requires some manual steps. You must always perform these steps after installing Java, including after upgrading the JDK.
(If you already understand this, feel free to skip the next three sections.)
When you run
javac HelloWorld.java , cmd must determine where javac.exe is located. This is accomplished with PATH , an environment variable.
An environment variable is a special key-value pair (e.g.
windir=C:WINDOWS ). Most came with the operating system, and some are required for proper system functioning. A list of them is passed to every program (including cmd) when it starts. On Windows, there are two types: user environment variables and system environment variables.
You can see your environment variables like this:
The most important variable is
PATH . It is a list of paths, separated by ; . When a command is entered into cmd, each directory in the list will be scanned for a matching executable.
On my computer,
PATH is:
When you run
javac HelloWorld.java , cmd, upon realizing that javac is not an internal command, searches the system PATH followed by the user PATH . It mechanically enters every directory in the list, and checks if javac.com , javac.exe , javac.bat , etc. is present. When it finds javac , it runs it. When it does not, it prints 'javac' is not recognized as an internal or external command, operable program or batch file.
You must add the Java executables directory to
PATH .
(If you already understand this, feel free to skip this section.)
When downloading Java, you are offered a choice between:
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You must make sure you have installed the JDK. If you have only installed the JRE, you cannot execute
javac because you do not have an installation of the Java compiler on your hard drive. Check your Windows programs list, and make sure the Java package's name includes the words 'Development Kit' in it.
![]()
(If you weren't planning to anyway, feel free to skip this section.)
Several other answers recommend executing some variation of:
Do not do that. There are several major problems with that command:
Points #1 and #2 can be solved with this slightly better version:
But it is just a bad idea in general.
The right way begins with finding where you have installed Java. This depends on how you have installed Java.
Exe installer
You have installed Java by running a setup program. Oracle's installer places versions of Java under
C:Program FilesJava (or C:Program Files (x86)Java ). With File Explorer or Command Prompt, navigate to that directory.
Each subfolder represents a version of Java. If there is only one, you have found it. Otherwise, choose the one that looks like the newer version. Make sure the folder name begins with
jdk (as opposed to jre ). Enter the directory.
Then enter the
bin directory of that.
You are now in the correct directory. Copy the path. If in File Explorer, click the address bar. If in Command Prompt, copy the prompt.
The resulting Java path should be in the form of (without quotes):
Zip file
You have downloaded a .zip containing the JDK. Extract it to some random place where it won't get in your way;
C:Java is an acceptable choice.
![]()
Then locate the
bin folder somewhere within it.
You are now in the correct directory. Copy its path. This is the Java path.
Remember to never move the folder, as that would invalidate the path.
That is the dialog to edit
PATH . There are numerous ways to get to that dialog, depending on your Windows version, UI settings, and how messed up your system configuration is.
Try some of these:
Java Compiler Download
Any of these should take you to the right settings dialog.
If you are on Windows 10, Microsoft has blessed you with a fancy new UI to edit
PATH . Otherwise, you will see PATH in its full semicolon-encrusted glory, squeezed into a single-line textbox. Do your best to make the necessary edits without breaking your system.
Look at
PATH . You almost definitely have two PATH variables (because of user vs. system environment variables). You need to look at both of them.
Check for other Java paths and remove them. Their existence can cause all sorts of conflicts. (For instance, if you have JRE 8 and JDK 11 in
PATH , in that order, then javac will invoke the Java 11 compiler, which will create version 55 .class files, but java will invoke the Java 8 JVM, which only supports up to version 52, and you will experience unsupported version errors and not be able to compile and run any programs.) Sidestep these problems by making sure you only have one Java path in PATH . And while you're at it, you may as well uninstall old Java versions, too. And remember that you don't need to have both a JDK and a JRE.
If you have
C:ProgramDataOracleJavajavapath , remove that as well. Oracle intended to solve the problem of Java paths breaking after upgrades by creating a symbolic link that would always point to the latest Java installation. Unfortunately, it often ends up pointing to the wrong location or simply not working. It is better to remove this entry and manually manage the Java path.
Now is also a good opportunity to perform general housekeeping on
PATH . If you have paths relating to software no longer installed on your PC, you can remove them. You can also shuffle the order of paths around (if you care about things like that).
Now take the Java path you found three steps ago, and place it in the system
PATH .
It shouldn't matter where in the list your new path goes; placing it at the end is a fine choice.
If you are using the pre-Windows 10 UI, make sure you have placed the semicolons correctly. There should be exactly one separating every path in the list.
There really isn't much else to say here. Simply add the path to
PATH and click OK.
While you're at it, you may as well set
JAVA_HOME as well. This is another environment variable that should also contain the Java path. Many Java and non-Java programs, including the popular Java build system Gradle, will throw errors if it is not correctly set.
If
JAVA_HOME does not exist, create it as a new system environment variable. Set it to the same Java path you added to PATH .
Remember to edit
JAVA_HOME after upgrading Java, too.
Though you have modified
PATH , all running programs, including cmd, only see the old PATH . This is because the list of all environment variables is only copied into a program when it begins executing; thereafter, it only consults the cached copy.
There is no good way to refresh cmd's environment variables, so simply close Command Prompt and open it again. If you are using an IDE, close and re-open it too.
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carlos c.carlos c.
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Sotirios Delimanolis
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Ahmad Azwar AnasAhmad Azwar Anas
You mistyped the MultiplyByZer0
set command – you missed the backslash after C: . It should be:
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RaghuramRaghuram
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Warhammer 40.000 dawn of war dark crusade download. Run the following from the command prompt:
set Path='C:Program FilesJavajdk1.7.0_09bin' or set PATH='C:Program FilesJavajdk1.7.0_09bin'
I have tried this and it works well.
Dacre Denny
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fresherfresher
If java command is working and getting problem with javac. then first check in jdk's bin directory javac.exe file is there or not.If javac.exe file is exist then set Erwin
JAVA_HOME as System variable.
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Umrao RawatUmrao Rawat
Check your environment variables.
In my case I had JAVA_HOME set in the System variables as well as in my User Account variables and the latter was set to a wrong version of Java. I also had the same problem with the Path variable.
After deleting JAVA_HOME from my User Account variables and removing the wrong path from the Path variable it worked correctly.
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