Develop Reference

Windows 10 Gradle: JAVA_HOME is set to an invalid directory

I was trying to run ./gradlew bootRun in both Git Bash and PowerShell, and got this error: ERROR: JAVA_HOME is set to an invalid directory: C:\Program Files\Java\jre1.8.0_121
The gradlew file is inside the project directory that cloned from git. It is a practice project from Spring official guide. There's also a gradle.bat file with these lines:
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%\bin\java.exe
I also tried to run Eclipse EE, which got no problem. The environment setting should be no problem.

In addition to Ernest's answer, the JAVA_HOME it wants is the actual directory, not the bin folder like the path wants for javac. Took me a while to work that out

Looks like your JAVA_HOME variable resolves to a JRE installation directory. But as you're talking about Gradle, you're surely trying to build/compile code.
If you have a JDK installed, change JAVA_HOME variable to point to it. The folder name should typically start with "jdk". Otherwise, you have to install a Java Development Kit.
You could also try exporting the variable manually before running gradle on the command line (SET JAVA_HOME=<path to the jdk directory>)

Please set the JAVA_HOME variable location to the path to JDK instead of JRE.
If that is correctly set, check the environment variables in Edit mode.
In my case, I found that a semicolon was appended to the JAVA_HOME environment variable at the end.
To check:
Open the environment variables list.
Select the variable and click Edit.
Remove the semicolon and Save.
Closed the settings and checked the path in cmd using echo %JAVA_HOME%, and ran gradle -v.
It ran perfectly.
Note: Check the variable value by clicking the Edit button as we cannot see the semicolon instead. Windows adds a semicolon so that the same variable can be used as the path to multiple locations.
Added picture for reference:

Found a solution I hadn't seen before in my googling.
Open up your gradlew.bat in some editor. On line 34-ish you will see this:
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%\bin\java.exe
if exist "%JAVA_EXE%" goto init
echo.
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
add this line to the error message: echo %JAVA_EXE%
so it looks like this
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
echo %JAVA_EXE%
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
Then run your gradlew.bat file.
The error should now appear again, but with the added echo of the path to JAVA_EXE. In my case it was echoing \bin\java.exe and NOT the full path C:\...\Java\jre1.8.0_251\bin\java.exe
to fix this, I changed
set JAVA_EXE=%JAVA_HOME%\bin\java.exe
to
set JAVA_EXE=C:\...\Java\jdk1.8.0_261\bin\java.exe
The value is now hardcoded, true, but it worked. I don't know why gradle doesn't concat the variable name into the path.

I've found myself with the same issue, although my JAVA_HOME was set to the correct JDK path.
However Windows 10 appended a semicolon at the end of the path.
This way the JAVA_HOME variable would work anywhere but not with Gradle.
I'm posting this, because it might spare someone else the time I've been looking for it ;)

If you didn't have admin rights, override the JAVA_HOME in User Environment Variable. Avoid typo by selecting the Java home folder. You must include folder before the bin ( do not include /bin) for java home.

If none of the above works open the gradle.bat file in an editor and make sure that IT is correct , in my case gradle was the problem

Windows 7 command line jps not working

Others have asked this question but the answer is usually the same and not helpful to my problem. I installed JDK, and added C:\Program Files\Java\jdk1.7.0_25\bin to the path system variable. I checked, jps.exe is in that directory. I restarted my computer but still have had no luck. When I run jps I get the error:
'jps is not recognized as an internal or external command, operable command or batch file'
When I run C:\Program Files\Java\jdk1.7.0_25\bin\jps.exe on the command line it works fine. Working in Windows 7.

Mildly obvious mistake, but I realize that I had spaces in between the directories in my path and that caused them to not be recognized. So I had %OTHER_PATH%; C:\Program Files\Java\jdk1.7.0_25; %ANOTHER_PATH%, which I just had to switch to %OTHER_PATH%;C:\Program Files\Java\jdk1.7.0_25;%ANOTHER_PATH%

Your JDK bin directory does not exist in PATH variable.
To add this you need to do below steps.
Go to "Control Panel >> System >> Advanced system settings >>
Environment Variables
Click 'Path' from System variables
Click Edit.
Now add the path "C:\Program Files\Java\jdk1.8.0_72\bin"
Now open command window and write jps. It will work now.

In addition to the above solutions, still if you have issue with jps command, Please check whether the default system installed java(JRE) path is already available in the Path variable.
My case i faced the same issue and observed the following path already available in the path variable.
"C:\Program Files (x86)\Common Files\Oracle\Java\javapath"
So I had to change the position(move up) of my new JAVA_HOME path, new JAVA_HOME path is above the default oracle javapath.

Setting up Tomcat through the Cmd line

I am presently trying to get tomcat to run on my computer for a servlet application. If i click the startup shell then the cmd line pops up then disappears. i tried to set up the Environmental variable with the lineJAVA_HOME=c:\Program Files\Java\JDK1.8.0_45 and JRE_HOME=c:\Program Files\Java\JDK1.8.0_45 and anytime i try to run startup i get the error:
The JRE_HOME environment variable is not defined correctly
This environment variable is needed to run the program
I have read through the tutorials and do not understand them, so if im missing something obvious please explain it simply

JRE_HOME is jre's path. Under \Java folder, you'll see jre7 probably. Copy its path to JRE_HOME section in environment variables.

"JAVA_HOME points to an invalid Java installation issue" with service install command in elastic search

I want to use elastic search with my PHP application.
after running service install command , I am getting fallowing error.
C:\elasticsearch-0.90.10\bin>service install
JAVA_HOME points to an invalid Java installation (no java.exe found in "C:\Progr
am Files (x86)\Java\jdk1.7.0_25\bin"). Existing...

Open up and Look into the service.bat file:
It searches for:
%JAVA_HOME%\bin\java.exe
hence your %JAVA_HOME% should not include bin in it.
A workaround if you do not have privileges to set up the environmental variables:
open the service.bat file,
a) Remove the line:
if NOT DEFINED JAVA_HOME goto err
b) Replace %JAVA_HOME% with your java jdk path, something like: C:\Program Files\Java\jdk1.7.0_51
Note: This is just a workaround which works all the time.

from your error message we can see your JAVA_HOME points to
C:\Program Files (x86)\Java\jdk1.7.0_25\bin
while it should point to
C:\Program Files (x86)\Java\jdk1.7.0_25

I think the error message is fairly descriptive , you should look in this folder
is java.exe there ? If not then your JAVA_HOME environment variable to point to the correct installation
heres a page showing how to do that
https://confluence.atlassian.com/display/DOC/Setting+the+JAVA_HOME+Variable+in+Windows
1st hit on google.

Either JAVA_HOME points to the wrong location or you don't have Java installed. Check and see if there's an install of Java in the location specified.
Also note that the JAVA_HOME variable should point to the root of the Java install not the /bin folder. This is being added by the program you're executing.
To change the JAVA_HOME variable to test further use the following in the command prompt:
set JAVA_HOME=c:\xxxx
Once you've established the correct value to use this can be permanently changed in Control Panel>>System>>Advanced System Settings>>Advanced>>Environment Variables

set JAVA_HOME=C:\Program Files (x86)\Java
Above must fix the issue, I came across the same issue while installing the elastic search.
i gave a try by giving "bin" part of path but it did not work, so i just give the top folder "java" in path, it worked.

Just to add my own experience.
i was setting JAVA_HOME using tab autocompletion.
It ends up something like "C:\Program files...:" and it didn't work saying that it cannot find the java program. I solved typing the JAVA_HOME path in the set command without using tab completion. The problem was probably related to the " in the env variable

Javac Command Not Working

My javac command is not working.
"javac is not recognized as an internal or external command, operable program or batch file."
-java version WORKS
I've tried setting classpath successfully in command prompt. SET CLASSPATH "C:\Program Files\Java\jdk1.7.0_09\bin";
Ive adding it in environment variables. ;C:\Program Files\Java\jdk1.7.0_09\bin ;C:\Program Files\Java\jre7\bin
Ive checked the bin folder java.exe is there aswell as javac.exe.
^ Tried all of these still doesn't work. I've also restarted command prompt still does not not work.
Why is not working?

You're using the correct path apparently, but you should assign it to the PATH variable, not to the CLASSPATH variable.
You're trying to set the access path to the executable files, not to the class files.

Just do this
In the same dialog, make sure that JAVA_HOME exists in your user variables or in the system variables and it is set to the location of your JDK,
e.g. C:\Program Files\Java\jdk1.5.0_02 and that %JAVA_HOME%\bin is in your Path environment variable.

Just set JAVA_HOME to
C:\Program Files\Java\jdk1.7.0_09

After adding the path to the jre7\bin-Folder to the PATH-Variable, you need to restart your Computer in most cases.

Did you tried to create a JAVA_HOME variable? The value should be the path of the java without the bin.
Also, try to open Eclipse.
If nothing helps, the last thing that you can do is install netbeans, it will configurate everything.