I downloaded this Java JDK and installed it.
But when I go to the command prompt to check the version, it says it's not recognized.
Is anyone else experiencing this issue with the latest Java?
I might not have installed the right version. I need the java that works with grails
C:\>java
'java' is not recognized as an internal or external command,
operable program or batch file.
C:\>java -version
'java' is not recognized as an internal or external command,
operable program or batch file.
C:\>
when i do a search on my computer for java, it does not find anything
Windows 2k8 R2 server-
For both java [-option] or %JAVA_HOME% to work in the command line you need the following:
In Control Panel->System and Security->System->Advanced system setting->Advanced->Environment Variables->System Variables
Edit the Path variable and add a ";" after the last value and add the the path to the Java bin directory:
e.g.- C:\Progra~2\Java\jre6\bin\
Add the JAVA_HOME Variable with the value set to the path for the java executable:
e.g.- C:\Progra~2\Java\jre6\bin\java.exe
Press simultaneously the "windows" and "pause" buttons on your keyboard, this will bring up the System Preferences dialog.
In the Advanced tab, find Environment Variables.
Then, in the User (upper) section, create or update the following two variables :
JAVA_HOME = where you put your JDK, eg. C:/Java/SDK
PATH = %JAVA_HOME%/bin
Close the dialogs.
Then, in a new command-line console, try "javac -version" and see if it's detected.
It's important that you use a new console, because environment variables are read only when the console is launched.
Java is typically installed (on Windows) as C:\Program Files\Java\jdk<version>
That installation directory has a subdirectory bin which you need to append to your PATH environment variable via the control panel. Then, the commands like java, javac etc. will be available on the command line.
BTW, the same is true for Grails.
Is the -version flag not recognized, or is the "java" command not recognized? One way to test this is just to type 'java' by itself and run it and see what happens.
If the command is not recognized, make sure that the JDK's install path is in your windows PATH. If not, you won't be able to use any of the java executables from the command prompt. Here's another link that may help out.
You need to manually add the path to javac.exe and java.exe to your operating system path. The Java installation program doesn't do that for you.
You most likely don't have java.exe in your system's PATH variable.
For Linux:
check $PATH and $JAVA_HOME. You can configure it in /etc/environment
From console you can check it like:
$ echo $PATH
For Windows:
My Computer -> Properties -> Advanced -> Environment Variables
Check there PATH.
From console you can check it like:
echo %PATH%
You should have a Java icon in Windows Control Panel. Locate the Java tab and click the View button. That will show you the path to the Java executables.
Last but not least, make sure you have restarted the computer so changes in the PATH variable can take effect.
You installed the JDK. Isn't java.exe part of the JRE? Do you have that installed?
Maybe your system variables in the environment variables are not set properly. Follow the steps in the link below. Finally, make sure the path component in system variables has only one JDK path. Delete other JDK paths that you won't use.
https://docs.oracle.com/javase/tutorial/essential/environment/paths.html
You might have installed a previous or older version of Java so you can just uninstall it and directly download JDK from Java JDK
I was also facing the same issue but when I downloaded and installed the latest version the issue was resolved.
Also uninstall any other Java versions which may be present in the program files.
To get to know other versions which may be present in your computer use Windows File Explorer to go to:
Files > Windows C > Program Files > Java
All the JDK and JRE you have will be listed there. Uninstall any other Java versions other than what you installed. And then make sure you have set the path variable of the JDK.
For me, it was incorrect line in the PATH
(1) Check PATH: Type "Edit System Environment Variables" on the search -> System Properties -> Advance -> Environment Variables -> System variables -> Path
(2) On the list, mine was C:\Program Files (x86)\Common Files\Oracle\Java\javapath so I just add \ at the end (the exe files in the javapath folder)
OS: Windows 10 64 bit
IF you set the PATH and it's not showing up in cmd when you run %PATH%, try restarting your computer.
Related
I have the JDK 10.0.2 installed, have the cmd opened in the folder of the class files of my program and try the command: javap Simulation.class .
I get the error that the command javap is not found. What do I do wrong?
You must have your $JAVA_HOME/bin directory added to system PATH for javap command to be available without it's absolute path.
Alternatively you can call javap using the absolute path:
/usr/lib/.../bin/javap Simulation.class
Assuming you are on Windows, check in your environment variable PATH whether path to Java executables is set.
Ex. If you have installed Java on path,say, C:\Program Files\Java\jdk-10
Then you have to add C:\Program Files\Java\jdk-10\bin to your PATH environment variable to be able to execute java commands from anywhere on command line.
References for Oracle Docs
https://docs.oracle.com/javase/10/install/installation-jdk-and-jre-microsoft-windows-platforms.htm#JSJIG-GUID-DAF345BA-B3E7-4CF2-B87A-B6662D691840
https://www.java.com/en/download/help/path.xml
On a sidenote, recommend you to move to Java 11 or 17 now that Java 10 is no longer supported. The above instructions would still remain same.
append $JAVA_HOME/bin to system $PATH variable. for example on linux
JAVA_HOME= "path of java installation on system"
export PATH = $JAVA_HOME/bin:$PATH
Open the control panel and type envir in search bar.
Click on edit the system environment variables.
Click on environment variables in the advanced system properties.
Click on path mentioned in user variables.
Edit the path, and click new and paste the path of java jdk.
In my system, the path is C:\Program Files\Java\jdk-17.0.2\bin, it could be different for your system.
Click ok, the problem must be solved now.
I am trying to install Java in Windows 10 Home (64 bit). Like many tutorials point out, I downloaded the Java jdk setup file, executed it and once installed changed the Path in the Environment Variables. But for some reason, when I execute the command 'javac' it returns the not internal/external command error in Command Prompt but runs absolutely fine in Powershell. I tried to rectify this by uninstalling Java and reinstalling it very carefully, following all the steps but still this keeps on happening.
Also, during installation of Java, I lost the original value to my Path variable. Could this be causing the problem?
Edit : I was able to get the java command running in the command prompt but javac still won't work. I've already tried the methods suggested on other forums and this one but no luck so far.
See there is no problem with Java installation if you can find JDK(Java development kit) and JRE(Server Java runtime environment) in programme files in windows in a JAVA folder.
The main problem is with the environment variable declaration.
Go to environment variables and make a new path for that.
JAVA_HOME = "YOUR JDK & JRE INSTALLATION PATH"
And another one is
JAVA = "YOUR JDK & JRE INSTALLATION PATH"
Hope that help to you. After doing that if still there problem persisist just restart your PC and check again.
Just add your variable location up to /bin/
Refer to this :
https://www.windows-commandline.com/javac-not-recognized-internal-external-command/
Open file explorer
Right click computer then click properties
click advanced system settings
click environmental variables
click path (for me there was one in user variables for admin and another in system variables)
find the directory for javac (for me it was here C:\Program Files (x86)\Java\jdk1.8.0_191\bin)
so go back to file explorer and open program files x86
then open the java folder
then open the jdk folder
then open the bin folder
highlight the path in the search bar and copy it
click edit on path and paste into the path in the environmental variable for both(if you have more than one path)
If no path exists then create one in user variables
If there is any existing text place a semicolon ; between the text you pasted in there and the preexisting text.
close command prompt and reopen it.
type javac -version
the version info should be listed
This problem comes up with the directory of your command prompt.
check your PowerShell and command prompt default directory.
We can run command prompt as WinKey+R then type cmd, Hit the enter button then check our java version cmd javac -version.
I have 3 java in my system 1.6, 1.7 and java 8.
I set my JAVA_HOME and path to 1.7, but when I run java -version using cmd administrator mode it return me 8.
Could anyone please tell me from where cmd pick java, and how i can change it to another version.
Updated: I already set java 7/bin in path variable
Start your cmd shell and type echo %PATH%.
OS would inspect listed directories and the first one that has java binary will be the one being used.
To change it - the PATH variable is set based on the settings in Control Panel -> System -> Advanced System Settings -> Environment Variables. You'd need to start a new cmd session to see updated changes.
When we run cmd as an administrator then it pick java.exe which is already available under C:/user/windows32 folder.
To resolve this issue, instead of appending my java at the end of the path, append in the starting of the path vaiable.
So here is the code used in cmd if run as administrator
set path=%JAVA_HOME%/bin;%path%;
java -version
I've been learning java on my own and I've come to a point where I need to pass arguments from the command prompt. I had previously been using Netbeans, which has become a bit of a crutch, but I want to learn how to program using notepad and the command prompt. I am running Windows 8.1. I downloaded the JDK 7 to my C:\ directory. I tried typing "java -version" and "javac -version" to check it out (as my book says to do) but it tells me "'java' is not recognized as an internal or external command, operable program or batch file." It says the same when I try javac. I do this from C:\ and from C:\Java> and get the same result. I uninstalled Netbeans, thinking maybe it was interfering somehow ... still not working. The book I'm using says it covers Java 7.
I don't understand why it doesn't work. Is there some compatibility issue with Java 7 and win 8.1? My java 7 is update 71 or 72. Did this update change something and now arguments are passed differently? Can anyone help me out? Thank you.
You need to download the JDK (if you don't already have it) and add the location to the end of your PATH. In a single command line session you can do this with PATH=%PATH%;<jdk location> where <jdk location> is the bin folder of the jdk.
Some installs of java manage environment variables and some do not. It appears yours has not. or you have not installed it correctly.
many applications understand JAVA_HOME, so you should set that to the root of the installation in your environment variables.
You will also need to add the bin folder to your path.
Generally, when using windows, you can install a windows exe version, which will manage all of this for you. Other installations just copy themselves to the c drive and expect java applications to know where to look.
Go to System environment variable. Select Variable PATH. Click on edit button. Append a ; after current value of Variable value. Copy jdk's bin folder path. In my PC it is "C:\Program Files\Java\jdk1.8.0_20\bin" without quotes. Then paste jdk's bin path. Copy jre's bin folder path. In my PC it is "C:\Program Files\Java\jdk1.8.0_20\jre\bin". Append a ; then paste jre's bin folder path. Click OK.
Download the JDK from this page. Run the installer.
Open the Command Prompt. Try it. It works. Yay!
If you use the full path to your java.exe, you dont need to set up any PATH and JAVA_HOME:
c:\> cd \work
c:\work> c:\java\bin\java.exe -cp classes\ your.Main
If your book does not use the normal JDK installers it really is supposed to explain that. (However it is normal behaviour for any executable).
(The above example asumes you compile into c:\work\classes\your\Main.class and your JDK is installed (installer does the unpack) in C:\java (typically you would use default locations like C:\Program Files\Java\jdk1.8.0\bin\java.exe).
I am getting error while doing 'play run'
"Could not execute the Java executable, please make sure the JAVA_HOME environment variable is set properly (the Java executable should reside at JAVA_HOME/bin/java)."
But I can confirm that , JAVA_HOME is set correctly, as I am able to run 'java' command from console i.e. DOS prompt.
Can anyone please guide me on this?
Set user variable
JAVA_HOME to C:\Progra~1\Java\jdk1.7.0_04
and
extend the system variable
Path with %JAVA_HOME%\bin;
works for me
I had the same problem on Windows 7. echo %JAVA_HOME% returned C:\Programmes\Java\jdk1.7.0, which seemed correct. However, in Windows 7, even though path looks like that in explorer, the "real" path to use with cmd is C:\Program Files\Java\jdk1.7.0.
I updated JAVA_HOME and restarted cmd — otherwise, the terminal wouldn't refresh its variables — and it worked smoothly.
Being able to run java from your command line does NOT indicate that you have set the JAVA_HOME variable. Do you know how to do that?? Or do you know how to check if this variable exist?
Here is a quick way IF you are using Windows: Right click My Computer (or Computer in Windows 7) then click the tab Advanced then environment variables. In the System variables check if there is an entry with the variable JAVA_HOME. If NOT create one (by clicking new) giving JAVA_HOME in variable name and the path of your jdk in the variable value. IF let's say, your jdk is installed on the following path: c:\jdk6 in your pc THEN this should be your variable value. Click Ok, Ok again and then run your app again!
Have you done echo %JAVA_HOME%?
Several issues:
JAVA_HOME (a variable used by the JVM) is not the same than PATH (a variable used by the OS to locate directories where to find executables). Doing java.exe just shows that the bin directory of Java is in PATH, not that JAVA_HOME points where it should (or even it exists)
Also, Windows usually does not use the PATH variable, but instead treats java specially and stores its location in the register (do an echo %PATH% to check this).
In conclussion: You cannot assume JAVA_HOME is set; check for it directly and set it (Control Panel-> System -> Advanced).
Make sure you use a DOS-Path in JAVA-Home. Meaning no fakes from Win-7 C:\Programme in real C:\Program Files and no blank in path.
C:\>dir /x Prog*
09.08.2011 13:55 <DIR> PROGRA~1 Program Files
21.08.2011 20:25 <DIR> PROGRA~2 Program Files (x86)
This is a safe solution.
echo %JAVA_HOME% is indeed always a good idea to.
If you have a 64 bit Windows version, make sure you have both the 32bit and 64bit version of Java installed (so there must be a Java directory in both Program Files and Program Files (x86). That was my problem.
I updated my jdk from 1.6.0_14 to 1.7.0_10 and my jre6 to jre7 and had the same problem on XP.
I then deleted JAVA_HOME and added it again and it worked.
I also added JRE_HOME as a System Variable
JAVA_HOME --> C:\Program Files\Java\jdk1.7.0_10
JRE_HOME --> C:\Program Files\Java\jre7