javac not working in windows command prompt
Solution 1:
If you added it in the control panel while your command prompt was open, that won't affect your current command prompt. You'll need to exit and re-open or simply do:
set "path=%path%;c:\program files\java\jdk1.6.0_16\bin"
By way of checking, execute:
echo %path%
from your command prompt and let us know what it is.
Otherwise, make sure there is a javac in that directory by trying:
"c:\program files\java\jdk1.6.0_16\bin\javac.exe"
from the command prompt. You can also tell which executable (if any) is being used with the command:
for %i in (javac.exe) do @echo %~$PATH:i
This is a neat trick similar to the which and/or whence commands in some UNIX-type operating systems.
Solution 2:
Windows OS searches the current directory and the directories listed in the PATH environment variable for executable programs. JDK's programs (such as Java compiler javac.exe and Java runtime java.exe) reside in directory "\bin" (where denotes the JDK installed directory, e.g., C:\Program Files\Java\jdk1.8.0_xx). You need to include the "\bin" directory in the PATH.
To edit the PATH environment variable in Windows XP/Vista/7/8:
Control Panel ⇒ System ⇒ Advanced system settings
Switch to "Advanced" tab ⇒ Environment Variables
In "System Variables", scroll down to select "PATH" ⇒ Edit
(( now read the following 3 times before proceeding, THERE IS NO UNDO ))
In "Variable value" field, INSERT "c:\Program Files\Java\jdk1.8.0_xx\bin" (Replace xx with the upgrade number and VERIFY that this is your JDK's binary directory!!!) IN FRONT of all the existing directories, followed by a semi-colon (;) which separates the JDK's binary directory from the rest of the existing directories. DO NOT DELETE any existing entries; otherwise, some existing applications may not run.
Variable name : PATH
Variable value : c:\Program Files\Java\jdk1.8.0_xx\bin;[existing entries...]
Solution 3:
After a long Google, I came to know that javac.exe will be inside JDK(C:\Program Files\Java\jdk(version number)\bin) not inside JRE (C:\Program Files (x86)\Java\jre7\bin) "JRE doesn't come with a compiler. It(JRE) is simply a java runtime environment. What you need is the Java development kit." in order to use compiler javac
javac will not work if you are pointing bin inside jre
In order to use javac in cmd , JDK must be installed in your system...
For javac path
path = C:\Program Files (x86)\Java\jre7\bin this is wrong
path = C:\Program Files\Java\jdk(version number)\bin this is correct
Make sure that "javac.exe" is inside your "C:\Program Files\Java\jdk(version number)\bin"
Don't get confused with JRE and JDK both are totally different
if you don't have JDK pls download from this link
https://jdk.java.net/
or
http://www.oracle.com/technetwork/java/javase/downloads/index.html
reference thread for JDK VS JRE What is the difference between JDK and JRE?
Solution 4:
I know this may not be your specific error, but I once had a leading space in my path and java would work but javac would not.
For what it's worth, I offer the sage advice: "Examine your Path closely".
Solution 5:
Okay this can not be the case always but many of us have done this mistake in the past and few out of those are still not aware of it, which is, every time you append a path (any path) of any environment variable, you're likely to hit the space bar right after the "semicolon" (as you normally would, after the "period" while typing in an editor).
This will create a leading space in the path e.g " C:\Program Files\Java\jdk1.6.0\bin" and therefore "javac.exe" won't be found by the system.