echo %JAVA_HOME% returns %JAVA_HOME% - java

When I do
echo %JAVA_HOME%
it returns %JAVA_HOME% on windows 10 what did I do wrong?


If you are sure that you have set them properly, you can print your environment variables like JAVA_HOME using any of the below methods in Windows 10.
Windows Command prompt ( cmd.exe )
C:\>echo %JAVA_HOME%
C:\Program Files\Java\jdk1.7.0_80
Git Bash within windows, you need to use the bash format
user12231#TP-UN103 MINGW64 /c
$ echo $JAVA_HOME
C:\Program Files\Java\jdk1.7.0_80
From the conversation, it looks like you are using Windows 10 powershell.
To print the environment variable in windows powershell, use one of the following commands as below
PS C:\>Get-ChildItem Env:JAVA_HOME
Name Value
---- -----
JAVA_HOME C:\Program Files\Java\jdk1.7.0_80
or
PS C:\> echo $env:JAVA_HOME
C:\Program Files\Java\jdk1.7.0_80
You can refer the Powershell documentation here.
https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_environment_variables?view=powershell-6#displaying-environment-variables


There is high possibility that you used the Windows10 PowerShell terminal unknowingly instead of the standard windows command prompt.
In a standard Windows command prompt, when you type the below command, you would get the JAVA_HOME path as expected.
echo %JAVA_HOME%
Upon issuing the same command in PowerShell you would see %JAVA_HOME% written out.
PowerShell does things differently.
In this case to output environment variables, you need to use
echo $env:JAVA_HOME
Additional tip:
To print all environment variables dictionary use
dir env:


The syntax depends on the shell/terminal you are using.
Try
echo $JAVA_HOME
this is the syntax for bash, for instance if you are using Git Bash to run your commands.


In windows, Open powershell and try this command
echo $env:JAVA_HOME
Or if you have Git Bash installed then try
echo $JAVA_HOME


If you just added the System Variable you need to reboot for System to read it
if you are using an classic cmd command "echo %JAVA_HOME%" in windowsJAVA is fine


Your command is correct for a windows 10 machine. And the result tells us, that this variable is not set.
You can look for the settings for the environment variables in your start menu. You'll see settings for other variables like Path, TEMP and so on. There you can add JAVA_HOME (here without %). The path would be like this (from my pc): C:\Program Files\Java\jdk1.8.0_161


It prints "JAVA_HOME" because you didn't set JAVA_HOME variable or you have typo in variable name. Just go to your environment variables settings and check if it's correct. If you don't have JAVA_HOME there just look at this question: How to set JAVA_HOME


I'm not sure, but i thought you need $ for Environment Variables.
Try: echo $JAVA_HOME


I know this answer is well overdue, but after hours of searching, it solved the problem for me.
Reinstall everything (git, jdk/jre, potentially maven), but when you do, leave EVERYTHING as its default value. Do not change any of the settings, DO NOT CHOOSE A SPECIFIC SAVE LOCATION that is convenient for you, etc. Leave everything as their default values.
Turns out, git is particularly rigid when it comes to flexibility, and it doesn't play well if you change the install location. When I was installing git, I changed the save location. I had been installing and practicing a bunch of new tools, and I wanted to have them all in one isolated spot. Just goes to show that the default way is usually the best way.


For Windows Powershell use
$env:JAVA_HOME
For Windows Command Prompt use
echo %JAVA_HOME%


i think u have installed jre, install jdk, your problem should be solved.


Check that you've added JAVA_HOME variable in a corresponding block. If wrong, add in the bottom block and restart Windows.

Related

Not able to set JAVA_HOME variable in ubuntu 14.04 on manual installation

I've downloaded java jdk1.8.0.7.tar.gz file from the official website and unzipped it into my home directory. Now to set the $JAVA_HOME variable I used the follwing commands command nano .bashrc and then appending export $JAVA_HOME=/home/shivam/Java/jdk1.8.0.7 at the end of the file . But whenever I run the command sudo $CATALINA_HOME/bin/startup.sh I get an error message saying
Neither the JAVA_HOME nor the JRE_HOME environment variable is defined
At least one of these environment variable is needed to run this program
I don't understand why it is unable to find the java path though I've installed tomcat and set its home variable the this way, which worked.
I wan't to install Java manually without using apt-get. Kindly guide .

You want to append the following to .bashrc:
JAVA_HOME=/home/shivam/Java/jdk1.8.0.7
Note the missing $ at the start.
Also remember that the file won't effect your current shell without sourceing it first.
Also, when running a command with sudo, you are running it as the root user, not as yourself. So the environment variable needs to be set for the root user, not yourself.
You can run sudo env | grep JAVA_HOME to see whether it is set for root.

Have you run .bashrc ?
source .bashrc

Try add the following 2 lines in your .bashrc file:
JAVA_HOME=/home/shivam/Java/jdk1.8.0.7/
export JAVA_HOME

JAVA_HOME is not set. Unexpected result may occur. Set JAVA_HOME to the directory of your local JDK to avoid this message

I am trying to install jboss-as-7.1.1.Final.
First I remarqued that I can't access the administration page of JBoss. Then I tried to add user and password from the command prompt and I saw this message appear:
JAVA_HOME is not set. Unexpected result may occur. Set JAVA_HOME to the directory of your local JDK to avoid this message.
When I've search for the problem, I've understand that I have to set java_home in the run.bat. But my run.bat content is different:
#!/bin/sh
# Placeholder for people used to run.sh from older version redirecting them to read the readme
echo
echo ========================================================================================
echo
echo To start JBoss Application Server please see `pwd`/../README.txt
echo
echo ========================================================================================
echo

JAVA_HOME is generally set as a Environmental(classpath) variable in your OS.
Batch files generally pick up JAVA_HOME value dynamically from this variable.
In Windows OS :-
Right click on My Computer > Advanced system settings > Environment Variables > Environment Variables > New > Variable Name as JAVA_HOME > Variable Value as JDK installation home path.
As #laune mentioned, you need to run run.bat not run.sh
For creating user, refer this https://docs.jboss.org/author/display/AS71/add-user+utility

if you are working on Ubuntu, then the solution is:
export JAVA_HOME=/usr/lib/jvm/default-java
after that, you can continue your installation.

Why can't Git Follow my Java JDK installation path?

I'm trying to compile a project in using Git Bash, but i'm having a problem with java.
I have the JDK version 1.8.0.25 installed under the path T:\Program Files\Java\jdk1.8.0_25.
Initially, I tried to set the JAVA_HOME variable via the command in Git like so:
$ JAVA_HOME="T:\Program Files\Java\jdk1.8.0_25" Java -jar BuildTools.jar
This didn't work, I get an unable to locate directory error.
So I tried manually setting the environment variable via the command:
setx JAVA_HOME "C:\Program Files\Java\jdk1.8.0_25"
Then I ran the compile command without the first part and I get an error saying that the compiler tools were not found in my (JRE) directory. Almost as if its ignoring the environment variable I set and searching the JRE instead of the JDK anyway. Why won't it follow the path I specify?

Are you sure you need to set the actual JAVA_HOME variable? If I remember correctly, for git bash it looks at the $PATH variable for the java version. Maybe try appending your java location here.
also, to double check (sorry if you already know this), you can run the env command to list all your environment variables.
$ env
Try setting the path and run the java -v command to verify the installation is correct. If not, what is the exact error?
$ java -v
Edit
Some more info, to set the $PATH in git windows I think you have to update your $HOME. See this or some other posts (google) for an explanation
Git for Windows: .bashrc or equivalent config files for Git Bash shell

JAVA_HOME is not recognized as an internal/external command

I've tried just about everything but it will not recognize it.
I have the latest version of JDK installed, the path is located at "C:\Program Files\Java\jdk1.8.0_25". This is what I'm using for my "variable value" field when I add the new variable "JAVA_HOME"..
I also have a %JAVA_HOME%\bin; in my path variable. I've restarted multiple times, making small changes..
Help me :(
Keep in mind I don't have much of a clue of what I'm doing.. So I could be going about it completely wrong.. Running it in cmd

Change the path value %JAVA_HOME%\bin, instead of set this
C:\Program Files\Java\jdk1.8.0_25\bin
After setting that, open command prompt and check whether you have set JAVA_HOME correctly.
echo %JAVA_HOME%
java
echo %JAVA_HOME% will print the location where java installed and java will show the usage of java.
See here how to set JAVA_HOME

How to set JAVA_HOME environment variable on Mac OS X 10.9?

I just purchased a brand new MacBook Pro.
This is my first MAC ever and I'm still trying to get the hang of navigating my way around.
Anyway, I'm also new to Java and I've been practicing on my Windows PC before it permanently died.
Now that I'm on this MAC, I installed my JDK and now I need to set the JAVA_HOME environment variable.
I have no idea what to do.
I tried following some of these guides and didn't get very far.
Mkyong.com : How to set JAVA_HOME variable in Mac OSX
YouTube : How to set environment variables on mac, linux, solaris, rhel
YouTube : How to Set Environment Variables in Mac
I was able to locate the terminal and I think I created some multiple files. I'm getting messages like this:
(1) Another program may be editing the same file.
If this is the case, be careful not to end up with two
different instances of the same file when making changes.
Quit, or continue with caution.
(2) An edit session for this file crashed.
If this is the case, use ":recover" or "vim -r /Users/Erwin/.bash_profile"
to recover the changes (see ":help recovery").
If you did this already, delete the swap file "/Users/Erwin/.bash_profile.sw p"
to avoid this message.
Can somebody tell how to set Java in Mac OSX environment step by step?

If you're using bash, all you have to do is:
echo export "JAVA_HOME=\$(/usr/libexec/java_home)" >> ~/.bash_profile
If you're using zsh (which probably means you're running macOS Catalina or newer), then it should instead be:
echo export "JAVA_HOME=\$(/usr/libexec/java_home)" >> ~/.zshrc
In either case, restart your shell.
If you have multiple JDK versions installed and you want it to be a specific one, you can use the -v flag to java_home like so:
echo export "JAVA_HOME=\$(/usr/libexec/java_home -v 1.7)" >> ~/.bash_profile

I just spent 2 hours setting this variable. The other answers did not work properly for me. I'm using macOS Catalina 10.15.4.
First, find your actual Java SDK Home directory:
/usr/libexec/java_home
Manually navigate there to make sure you don't have any mistakes due to incorrect versions, etc. For me, this was:
/Library/Java/JavaVirtualMachines/jdk-13.0.2.jdk/Contents/Home
Next, edit your terminal's profile. If you're using zsh, this will be:
vim ~/.zshrc
If you're not using zsh, this will be:
vim ~/.bash_profile
Inside, add the following new line anywhere in the file:
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk-13.0.2.jdk/Contents/Home
Restart your terminal app (or source ~/.bash_profile), and it should work properly.

I did it by putting
export JAVA_HOME=`/usr/libexec/java_home`
(backtics) in my .bashrc. See my comment on Adrian's answer.

Set $JAVA_HOME environment variable on latest or older Mac OSX.
Download & Install install JDK
First, install JDK
Open terminal check java version
$ java -version
Set JAVA_HOME environment variable
Open .zprofile file
$ open -t .zprofile
Or create . zprofile file
$ open -t .zprofile
write in .zprofile
export JAVA_HOME=$(/usr/libexec/java_home)
Save .zprofile and close the bash file & then write in the terminal for work perfectly.
$ source .zprofile
Setup test in terminal
$ echo $JAVA_HOME
/Library/Java/JavaVirtualMachines/jdk-13.0.1.jdk/Contents/Home

In Mac OSX 10.5 or later, Apple recommends to set the $JAVA_HOME variable to /usr/libexec/java_home, just export $JAVA_HOME in file ~/. bash_profile or ~/.profile.
Open the terminal and run the below command.
$ vim .bash_profile
export JAVA_HOME=$(/usr/libexec/java_home)
save and exit from vim editor, then run the source command on .bash_profile
$ source .bash_profile
$ echo $JAVA_HOME
/Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home

It is recommended to check default terminal shell before set JAVA_HOME environment variable, via following commands:
$ echo $SHELL
/bin/bash
If your default terminal is /bin/bash (Bash), then you should use #Adrian Petrescu method.
If your default terminal is /bin/zsh (Z Shell), then you should set these environment variable in ~/.zshenv file with following contents:
export JAVA_HOME="$(/usr/libexec/java_home)"
Similarly, any other terminal type not mentioned above, you should set environment variable in its respective terminal env file.

If you are using Zsh, then try to add this line in ~/.zshrc file & restart terminal.
export JAVA_HOME=$(/usr/libexec/java_home)

I got it working by adding to ~/.profile. Somehow after updating to El Capitan beta, it didnt work even though JAVA_HOME was defined in .bash_profile.
If there are any El Capitan beta users, try adding to .profile

Since I'm using openjdk managed with sdkman, I added
sudo ln -sfn /path/to/my/installed/jdk/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk.jdk
Adding this to your system lets java_home recognize your installed version of Java even when its not installed via standard packages

I checked my /Library/Java/JavaVirtualMachines/
directory and found the version to be jdk1.8.0_321.jdk/Contents/Home
and added this directly to my .bash_profile:
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_321.jdk/Contents/Home
but it's still complaining after sourcing the .bash_profile:The operation couldn’t be completed. Unable to locate a Java Runtime that supports apt.

In the latest Mac, you have to add the Set $JAVA_HOME environment variable in .zprofile. Here, we simple way to open it. Press ⌘ + Shift + . from keyboard. Just open it and add the $JAVA_HOME environment variable as explained here:

JAVA 11 via Homebrew - tested on macos Ventura 2022
.zshrc
export JAVA_HOME=/opt/homebrew/opt/openjdk#11/libexec/openjdk.jdk/Contents/Home

For Mac M1
Download & Install install JDK
Open terminal check java version
java -version
Now create a file
touch .zprofile
Open the file
open -t .zprofile
Add the below line
export JAVA_HOME=$(/usr/libexec/java_home)

I resolved it on macOS Monterey by using the option provided by Google
Under Gradle JDK, choose the Embedded JDK option.
https://developer.android.com/studio/intro/studio-config#:~:text=A%20copy%20of%20the%20latest,use%20for%20your%20Android%20projects.

I'm able to solve this issue by setting JAVA_HOME in .bash_profile file
export JAVA_HOME=/usr/local/opt/openjdk#17
Note:
I installed openjdk version 17 using 'brew'. I got this location from brew console. I'm using 'bash' instead of 'zsh' in my mac.

Open Terminal.
Confirm you have JDK by typing “which java”. ...
Check you have the needed version of Java, by typing
“java -version”.
Set JAVA_HOME using this command in Terminal: export
JAVA_HOME=/Library/Java/Home.
echo $JAVA_HOME on Terminal to confirm
the path.

More simply on a mac terminal with a modern OSX
$ vim ~/.zshrc
Type "a" to being editing, and then paste (ctrl + v):
$ JAVA_HOME=/usr/libexec/java_home
then hit "escape" and type exactly ":wq" in order to write to the file and quit vim mode.
Finally, when out of vim mode and back in your terminal, type
$ source ~/.zshrc
This will refresh so that your terminal is aware of the changes.
IMPORTANT * If you don't "source" the file, you won't see the changes in this terminal session.
Check the changes by typing
$ echo $JAVA_HOME
and you should see /usr/libexec/java_home

Quick Guide for M1
Add java sdk into your m1
check version
java --version
Get all java versions installed in ur mac
/usr/libexec/java_home -V
Execute for Java path from library
/usr/libexec/java_home
(specify java version if you have multiple version, In my case -v17.0.5
/usr/libexec/java_home -v17.0.5
Mac>User>'YourUserName/Home'>.zshrc
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk-17.0.5.jdk/Contents/Home

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