'javac' is not recognized as an internal or external command

Question

I have to convert my Matlab algorithm in Java. For this I\'m using matlab builder ja toolbox, after following all the necessary steps, the build fails and this error is disp

Answer 1

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 HelloWorld.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 website

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.

Answer 2

Set Following Environment Variables It will works

JAVA_HOME=C:\Program Files\Java\jdk1.7.0_09
set PATH=%JAVA_HOME%\bin

Answer 3

To solve the aforementioned problem follow the mentioned steps:

1) Copy the address location of your Java\jdk\bin folder usually installed in your C: drive. It should look something like this:

C:\Program Files (x86)\Java\jdk1.8.0_65\bin

2) Right click on My Computer-->Properties-->Change settings--> Advanced-->Environment Variables.. -->New..

3) Now,

 Set Variable name: PATH
 Variable value: C:\Program Files (x86)\Java\jdk1.8.0_65\bin

4) Press OK, re-open your cmd and compile your program.

Hopefully it worked!

Answer 4

You need to make sure that Java SDK is installed and also PATH is set properly so that windows would be able to know where the executable is. Detailed steps on how to debug this issue is explained here: http://www.windows-commandline.com/javac-not-recognized-internal-external-command/

Answer 5

If you want javac (the compiler), you'll need to download the Java Development Kit (JDK), not just the Java Runtime Environment (JRE). Note that the JDK includes a JRE.

This tutorial give instructions to install JDK to your computer.

Answer 6

Path is defined as the filename. Ex, C://aklsej;dlfkj/blahblah

You will need to specify the full path in the system control panel, advanced system settings, edit variables, edit path, put a semicolon after the last entry and don't delete anything, and then add the full path wherever you installed java to.

to make this easy, do a search for javac in the search panel and then just add the full path to the environmental variables from there.