So you are trying to compile your Java source file and getting "'javac'
is not recognized as an internal or external command". If this is your
first Java program or HelloWorld than I suggest to go 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 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 does you get this error and from where does 'javac' is not recognized as an internal or external command comes.
This is an standard error in Windows command line 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 executing 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 is 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 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
Other 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 program and can not compile Java program because JRE doesn't
contain javac in there bin folder. To know more about JRE
and JDK, see difference
between JRE and JDK. In this case you need to download and install Java in
your System. You can download current version of Java from Oracle's site.
Another possible reason of " javac is not recognized as an
internal or external command " is
setting PATH with incorrect directory e.g. path may not contain forward slash
or missed something. Best way to verify this is just copy path of JDK from PATH
variable and execute in command line, if you can not get into that directory
which means path to JDK installation folder is incorrect. In this case go to bin
directory of JDK installation directory and copy its address from address bar
and add into PATH to make this work.
So root cause of "javac is not recognized as an internal or external command " is that system
is not able to find javac command from its PATH. just double check PATH and
add bin folder of JDK installation directory in path, if not included already.
Remember to close and re open command prompt once you make this change, this
will fix " javac is not recognized
as an internal or external command " error.
Other Java tutorials for Beginners
Source:http://javarevisited.blogspot.com/2012/12/javac-is-not-recognized-as-internal-or-external-command.html
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