Javac не является внутренней или внешней командой windows 10

задан 3 авг 2017 в 17:24

Причина ошибки — заданы некорректные «переменные среды». Соответственно, необходимо указать правильные.

На рабочем столе откройте «Этот компьютер»:

1. Нажмите слева вверху «Свойства», затем слева в меню —
   «Дополнительные параметры системы».
2. В открывшейся вкладке «Дополнительно» в самом низу выберите
   «Переменные среды».
3. Откроется содержимое. Нажмите в каждом окне поочередно «Создать».
4. В окне «Новая пользовательская переменная» пропишите CLASSPATH.
5. Затем в окне «Новая системная переменная» укажите переменную PATH. В
   поле «Значение» пропишите директорию к пакету JDK.
6. Перезагрузите Windows.

Кроме того, чтобы выполнить Javac, вы можете в командной строке прописать полный путь к консоли. К примеру: C:\Program Files\Java\jdk1.8.0_102\bin\javac.exe" MyFile.java

Источник

ответ дан 3 авг 2017 в 17:28

ответ дан 24 ноя 2017 в 16:50

ответ дан 26 авг 2018 в 10:03

asked Nov 5, 2009 at 5:26

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.

answered Nov 5, 2009 at 5:29

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:

1. Control Panel ⇒ System ⇒ Advanced system settings

2. Switch to «Advanced» tab ⇒ Environment Variables

3. 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...]

answered Apr 6, 2012 at 17:07

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 the path points to bin inside jre folder

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?

answered Dec 31, 2013 at 15:06

SamSam

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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.

answered Aug 3, 2013 at 7:32

Try the solutions here: http://techdem.centerkey.com/2009/05/javahome-command-script.html

These are much more robust to change — like when you upgrade the JDK or JRE, since there is no hard coded path.

The quick solution (if you don’t want to read the blog) is

C:\>for /d %i in ("\Program Files\Java\jdk*") do set JAVA_HOME=%i
C:\>set PATH=%PATH%;%JAVA_HOME%

You can then add these lines to a startup/login script.

answered Nov 4, 2013 at 15:10

I just had to do this to get this to work on windows 7 64.

Open up a command prompt (cmd.exe) and type:

set CLASSPATH=C:\Program Files\Java\jdk1.7.0_01\bin

Make sure you reopen all running command prompt Windows to get the environment variable updated as well.

answered Sep 15, 2014 at 11:24

answered Jan 27, 2015 at 2:05

answered Mar 31, 2014 at 15:49

NeilNeil

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for /d %i in ("\Program Files\Java\jdk*") do set JAVA_HOME=%i
set JAVA_HOME

this solution worked to me

answered Sep 2, 2017 at 6:45

answered Nov 5, 2009 at 5:31