I am installing ant on a Windows XP machine, and am following the instructions at Apache's manual site. It said to set JAVA_HOME, so I checked, saw there was no environment variable named JAVA_HOME, made one, and set it to "C:\Program Files\Java\jdk1.6.0_19"
When I try to run ant debug, however, it tells me that JAVA_HOME is currently set to "C:\Program Files\Java\jre6"
I'm guessing JAVA_HOME isn't an environment variable. But if it isn't one, I'm at a loss as to where to start looking for it. Anybody know?
Edit: Oh yeah - it's bugging me for tools.jar as well, but I'm guessing that when I fix the JAVA_HOME issue, that will help the terminal find tools.jar as well. Or maybe I'm wrong. Thanks
Following on Newtopian's suggestions, you can quickly confirm if that behavior is the problem by running in the terminal
C:\>set JAVA_HOME=C:\Program Files\Java\jdk1.6.0_19
C:\>ant debug
Also, I'm not sure if the text you entered into the JAVA_HOME environment variable is literally "C:\Program Files\Java\jdk1.6.0_19", i.e., with quotes, but if so, you should remove the quote marks as they'll throw off ant.bat.
Here's the relevant bit from ant.bat
:checkJava
set _JAVACMD=%JAVACMD%
if "%JAVA_HOME%" == "" goto noJavaHome
if not exist "%JAVA_HOME%\bin\java.exe" goto noJavaHome
if "%_JAVACMD%" == "" set _JAVACMD=%JAVA_HOME%\bin\java.exe
goto checkJikes
:noJavaHome
if "%_JAVACMD%" == "" set _JAVACMD=java.exe
... omitted ...
"%_JAVACMD%" %ANT_OPTS% -classpath "%ANT_HOME%\lib\ant-launcher.jar" "-Dant.home=%ANT_HOME%" org.apache.tools.ant.launch.Launcher %ANT_ARGS% %ANT_CMD_LINE_ARGS%
If that doesn't help, could you post your debug task?
Two options to make it permanent:
Run this:
C:\>REG delete HKCU\Environment /V JAVA_HOME
C:\>REG delete HKLM\Environment /V JAVA_HOME
C:\>REG add HKCU\Environment /V JAVA_HOME /d "C:\Program Files\Java\jdk1.6.0_19"
(basically, ensure you only have one JAVA_HOME set and it's correct; be sure to close and reopen the terminal after doing this)
If all else fails, the crappy batch file solution:
#echo off
set JAVA_HOME=C:\Program Files\Java\jdk1.6.0_19
ant %*
save as ant_wrapper.bat (or whatever) and you should be able to do ant_wrapper debug.
(Both of these solutions are untested)
Make sure you check both user and system scope environment Variables. I am not certain what is the precedence of one over the other here but most likely you checked as only one and created it there and it is being overridden by the other.
Also when you create the environment variable make sure you open a new command shell for the changes to take effect. then try 'set' that will list all environment variables seen in the environment for the command prompt you just created.
If all is well there but Ant still does not see the correct one then check the batch files that start ANT if the javahome is not set there too. If it is make sure it uses the environment variable and does not try and set it again.
Hope this helps
Related
As-salāmu ʿalaykum,
I'm having trouble setting JAVA_HOME correctly.
I know that the JAVA_HOME needs to be set to C:\Program Files\Java\jdk1.8.0_92
I know PATH has to be set toC:\Program Files\Java\jdk1.8.0_92\bin
I set both the JAVA_HOME and PATH as a user variable and as a system variable.
When I run Android Studio tells me it's invalid. When I echo out JAVA_HOME, it's set as expected. Any ideas?
You need to set your JAVA_HOME to: C:\Program Files\Java\jdk1.8.0_92\
And set PATH to: C:\Program Files\Java\jdk1.8.0_92\bin so that it can be accessible from cmd
Then you might need to restart the computer
Note:
In some cases JAVA_HOME is specified differently somewhere else such as gradle.properties file. In that case, the global value can be overridden by the project's JAVA_HOME for that specific project.
You didn't mention which windows version you are working on. However, you can try to set the JAVA_HOME variable via the command line as an alternate solution.
Open Command Prompt (make sure you Run as administrator so you're able to add a system environment variable).
Set the value of the environment variable to your JDK (or JRE) installation path as follows:
setx -m JAVA_HOME "C:\Progra~1\Java\jdk1.8.0_XX"
If the path contains spaces, use the shortened path name.
Restart Command Prompt to reload the environment variables then use the following command to check the it's been added correctly.
echo %JAVA_HOME%
You should see the path to your JDK (or JRE) installation.
Besides defining the path you need to enable Java in Windows Defender.
Hint: Disable windows defender and firewall (google it).
Put in the prompt "java -version" and "javac -version" commands again and have fun.
Sorry, english isn’t my first language.
I followed this thread to solve my problem, I have the same problem with a different version of JDK and for some reason it didn't work. I still get -bash: JAVA_HOME: command not found when I type JAVA_HOME to my terminal.
I have JDK1.8.0.45 located at Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home which I can access with /usr/libexec/java_home
Using
echo "export JAVA_HOME=/usr/libexec/java_home" >> ~/.profile
~/.profile
I do get
"export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home"
saved to ~/.profile, and I can check this using /usr/bin/open ~/.profile
But I do not understand why JAVA_HOME still doesn't work and I need this to install maven.
Thanks!
My ~/.bash_profile has this line in it, and it's been working fine.
export JAVA_HOME=$(/usr/libexec/java_home)
This line basically says "run the program named /usr/libexec/java_home and export its output as a variable named JAVA_HOME."
I suggest opening your .profile or .bash_profile in a text editor rather than using echo statements to append new lines to it. That way you can see everything that's in the file and make sure other old lines in the file aren't causing you issues.
After you make a change to .bash_profile, make sure you open a new terminal window before testing it.
You can check the value of any environment variable (including JAVA_HOME) by simply echo'ing its value:
echo $JAVA_HOME
In my case the output of that echo command is:
/Library/Java/JavaVirtualMachines/jdk1.8.0_40.jdk/Contents/Home
Probably you misunderstood things. JAVA_HOME is not a command, it's an environment variable. You can't call JAVA_HOME in your terminal since - in fact - there is no such command, what your error message says.
You can see this variable's value by:
echo $JAVA_HOME
If it is set and points to a proper location then it's fine. Some tools that expect this variable to be set (e.g. Maven or Java IDEs) will work well.
I did the following steps but java does not seem to be working for me, do I need to restart my system if yes then why?
1. Right click My Computer->Advence Option->Environment Varibles->System Variables
2. variable : Path->Edit
3. Copy your jdk bin directory i.e.C:\Program Files\Java\jdk1.7.0_51\bin
4. Paste it after putting a semi-colon(;) in value section
i am getting below error while running java in cmd
C:\Users\User>java -version
Error: opening registry key 'Software\JavaSoft\Java Runtime Environment'
Error: could not find java.dll
Error: Could not find Java SE Runtime Environment.
No, but you will need to close and recreate any cmd windows, running java programs, or the like.
To check it's correct, open a new cmd window and type set -> review the information for PATH and JAVA_HOME.
You should set two things:
JAVA_HOME
PATH
The first lies under the "User variables for [your user name]" section. Add the JAVA_HOME variable and set it to where your jdk is installed. i.e. C:\Program Files\Java\jdk1.7.0_51\
The second lies under the "System variables" section. You should find the "path" variable, and edit it. Then, append ";%JAVA_HOME%\bin" (minus the quotes) to the end of the path variable.
After you have done this, save the variables and close that window clicking the "ok" button. Close down all instances of the command prompt (and any IDE you may be developing with such as Eclipse or NetBeans), and reopen one command prompt. Then, if you would like to test whether or not your changes worked and are in effect, try the following:
echo %JAVA_HOME%
This should output where you set your java home variable to.
echo %PATH%
At the end of what is output, you should see your java home\bin addition to the path variable
java -version
If you can run this command from the command line, it means that your environment was set up correctly and java is now in your path.
Not necessary. Quit and Open the command prompt again (if any) that runs the java process and type java -version to check if it installed successfully.
If you are using mac, source ~/.bashrc or source ~/.zshrc should refresh your environmental variable. No need to re-start the terminal even.
No, you don't need to restart your system.
However, you have to restart your command prompt application to update the changes done on Environment variables.
NO.
You don't need to restart the system, but just the application like cmd or any IDE you are using for java development (i.e Eclipse) need to restart.
And to confirm that the java path is set that you have mentioned in JAVA_HOME environment variable, you can open cmd and you can check with commands echo %JAVA_HOME% or echo %PATH%.
I reinstall the JDK and set the JAVA_HOME and PATH variable again. now it's working.
In my case under user variable section(for particularuser) JAVA_HOME set to jre not jdk path . I change it to JDK path , It worked for me
yes need to restart cmd prompt after env variable change
I have downloaded both Java jdk1.7.0_06 and Java jre7. and i added the following system variable JAVA_HOME C:\Program Files\Java\jdk1.7.0_06\bin to my windows 7. But when I type the following in the CMD command line on my windows 7 C:\activiti-5.10\activiti-5.10\setup>ant demo.start to run a demo application I got the following error in the command line '
"java.exe"' is not recognized as an internal or external command, operable program or batch file
So does anyone know how i can solve this problem ?
BR
If you look at the "ant.bat" file, you will see that it looks for the "java" command in the following way:
If the %JAVACMD% environment variable is set, then it uses that.
Otherwise, if the %JAVA_HOME% environment variable is set, it tries to use %JAVA_HOME%\bin\java.exe
Otherwise, it tries to use java.exe; i.e. it will look on your %PATH%.
In your case, you have %JAVA_HOME% set ... but set to the Java installation's "bin" directory, not to the root of the installation. So the Ant.bat script looks in the wrong place for java.exe.
Just set %JAVA_HOME% correctly, and it should work.
JAVA_HOME C:\Program Files\Java\jdk1.7.0_06
As you can see from the above, you do not need to have the Java "bin" directory on your %PATH% for Ant to work, but it is a good idea to set it anyway. That way you can run the Java commands simply from the command line.
The setting of %CLASSPATH% is not relevant to this problem. Indeed, unless the build.xml file is broken, Ant will ignore your %CLASSPATH% environment variable.
You need to put the file java.exe in your PATH variable but the JRE in JAVA_HOME
JAVA_HOME is the path of JDK root folder.eg: C:\Program Files\Java\jdk1.7.0_06 but path define C:\Program Files\Java\jdk1.7.0_06\bin
JAVA_HOME C:\Program Files\Java\jdk1.7.0_06
JRE_HOME C:\Program Files\Java\jre1.7.0_06
path = C:\Program Files\Java\jdk1.7.0_06\bin;C:\Program Files\Java\jre1.7.0_06\bin
Typically JAVA_HOME should be the parent directory of the "bin" folder.(jre or jdk)
In this case ant expects the java to be from the JDK.
try following in a cmd window
set JAVA_HOME=C:\Program Files\Java\jdk1.7.0_06
set path="%JAVA_HOME%/bin;%path%;
ant
(side note: adding java.exe to path is not a requirement for ant; it is a convenience thing for the user)
Just delete the following set of files from your %windir/System32 folder. Actually deleting java.exe is enough but for consistency sake just delete all the java related binaries.
java.exe
javaw.exe
javaws.exe
Actually oracle windows installer places a copy of these files into %windir/System32 folder (which I don't understand why) but looks like they are not needed (as they are available anyway under JDK folder where you install them).
I have tried all the various solutions posted in the SO and other forums as well but none of them worked for me. I have also set all the relevant environment variables (JAVA_PATH, CLASS_PATH etc) correctly as well. Finally this is the only solution that has worked for me.
Go to the \squirrel-sql-3.9.0>squirrel-sql.bat .open that squirrel-sql.bat in Notepad and comment out the existing logic which is
=======================================
if exist "%IZPACK_JAVA%\bin\javaw.exe" (
set LOCAL_JAVA=%IZPACK_JAVA%\bin\javaw.exe
) else (
set LOCAL_JAVA=javaw.exe
)
echo Using java: %LOCAL_JAVA%
=================================
and add the below logic
#echo off
set LOCAL_JAVA=C:\Program Files (x86)\Java\jre7\bin\javaw.exe
echo Using java: %LOCAL_JAVA%
================================
make sure you add the correct path of javax.exe while adding above logic set LOCAL_JAVA=
and start the .bat file from CMD ..that's it. It should work. It worked for me.
I started getting this error in Android Studio after I updated it to version "Electric Eel".
It happened because Android Studio has changed where they put their JRE:
it used to be C:\Program Files\Android\Android Studio\jre
but now it is C:\Program Files\Android\Android Studio\jbr
To fix:
updated my JAVA_HOME environment variable to point to the new java location (C:\Program Files\Android\Android Studio\jre)
and then restarted Android Studio, and now it is fixed.
I agree with the above explanation but if the problem still persists try setting:
CLASSPATH = C:\Program Files\Java\jdk1.7.0_06\bin
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