I am trying to follow a tutorial about how to use ant to build and run your application. I've followed all the steps and have created the build file, but when I try to run ant it gives me this error.
BUILD FAILED
/home/bilal/tmp/ant/build.xml:19: Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK.
It is currently set to "/usr/lib/jvm/java-6-openjdk/jre"
Any ideas how to resolve this issue ?
Make JAVA_HOME variable point to a jdk installation, not jre.
You are referencing the runtime environment, not the development kit - it can't find the compiler because its not there.
From the line you posted, which states you have open-jdk you can just remove the jre at end:
export JAVA_HOME='/usr/lib/jvm/java-6-openjdk/'
You installed java...
apt-get install default-jre
But not the JDK...
apt-get install default-jdk
This is by design. You cannot use ant's java.home (which is a java.lang.System property) interchangeably with how JAVA_HOME is set in the OS environment. You are probably trying to assert the location of the Java compiler with a fundamentally different value from a different property layer -- i.e. java.home (from Ant's Java internals) points to the Java Runtime Environment at <any_installed_java_pointed_to_by_ant>/jre while JDK_HOME (from the OS environment) is usually set to <DOWNLOADED_AND_INSTALLED_JAVA_DEVELOPMENT_KIT>.
See my question and answer here for more details: Where does Ant set its 'java.home' (and is it wrong) and is it supposed to append '/jre'?
The solution is to access the system environment property within Ant by using ${env.JAVA_HOME}. Specify which java to use explicitly in the Javac Task by setting the executable property to the javac path and the fork property to yes (see Ant's Javac Task Documentation). That way, it doesn't matter what Java environment Ant is running inside, the compiler is always clearly specified!
I know this question is old but the accepted answer does not work anymore and since this is the fist link on google search i'll tell how i solved this problem.
for eclipse using ubuntu:
go to Window->Preferences->Ant->Runtime->Select Ant_Home_Entries and click on add external jars then find in file explorer where your jdk is (default is in /usr/lib/jvm/) and in the lib folder of your jdk you will find the tool.jar. select this one and click apply.
try to build your project and things should work!
note: i hadn't used ant for a long time but needed it for ycsb couchbase workload generator (http://www.couchbase.com/wiki/display/couchbase/Load+Generator+Setup) if anyone is/was stuck on this.
It looks like you are currently pointing JAVA_HOME to /usr/lib/jvm/java-6-openjdk/jre which appears to be a JRE not a JDK. Try setting JAVA_HOME to /usr/lib/jvm/java-6-openjdk.
The JRE does not contain the Java compiler, only the JDK (Java Developer Kit) contains it.
I am using Windows 7 and have struggled with the same issue. I fixed it by changing my environment variables.
To change your environment variables click here
I added ";%JAVA_HOME%/bin" to the end of paths variable and added a new "JAVA_HOME" variable and set its value to the location of my JDK "C:\Program Files\Java\jdk1.8.0_11". After that I restarted my Node.js command prompt and it worked.
Please note you JDK directory may be different then mine. Also depending on your setup, you may need to restart you computer after setting the environment variables.
The JAVA_HOME you have above only points to the JRE, which does not contain the compiler. Set your JAVA_HOME to
/usr/lib/jvm/java-6-openjdk
...and try again.
I had a similar problem and it turned out the issue was having both versions 6 & 7 of OpenJDK. The answer comes from r-senior on ubuntu forums (http://ubuntuforums.org/showthread.php?t=1977619) --- just uninstall version 6:
sudo apt-get remove openjdk-6-*
make sure that JAVA_HOME and CLASSPATH aren't set to anything since that isn't actually the problem.
for centos yum -y install java-1.7.0-openjdk-devel.x86_64
and update JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk.x86-64
I just copied tools.jar file from JDK\lib folder to JRE\lib folder. Since then it worked like a champ.
Experienced this issue when trying to run the android emulator with Meteor 1.0 on elementary OS Luna (based on Ubuntu 12.04 LTS sources).
openjdk-6-jdk was installed, as well as the jre. In the end, not expecting any success, I tried:
sudo apt-get remove openjdk-6-*
this resulted in fully expected errors, so I followed up with
sudo apt-get install openjdk-6-jdk
and things worked. Go figure.
On Ubuntu 14.04, I found two parts to solving the problem:
Remove /jre from the environment variable. For me: export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64/
Install the JDK as well as the JRE: sudo apt-get install default-jdk
Once you update the JAVA_HOME path as stated in the answer, you should do this:
$source ~/.bashrc
This will refresh bashrc show the updated path in $JAVA_HOME when you check again.
Execute:
$ export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.141-3.b16.el6_9.x86_64
and set operating system environment:
vi /etc/environment
Then follow these steps:
Press i
Paste
JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.141-3.b16.el6_9.x86_64
Press esc
Press :wq
I met this issue in rhel, my "JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk"(which is a symbolic link), and ant complains.
MY solution for this is to use the real jdk path in JAVA_HOME, like:
JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-0.b14.el7_4.x86_64
It works for me.
Under Jenkins it complains like :
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-1.el7_6.x86_64/ doesn’t look like a JDK directory
Reason : Unable to found any Dev Kit for JDK.
Solution:
Please make sure to install openjdk-devel package as well along with your JDK-1.8* version and reexport with : # source ~/.bash_profile
Related
My question is similar to this. I am trying to work with Java in Remote-WSL using VSCode. According to VSCode guidelines, I should install the Java Extension Pack on WSL. However, when I try to install it I get the following error:
The java.home variable defined in Visual Studio Code settings points to a missing or inaccessible folder (C:\Program Files\Java\jdk-9.0.1)
This is what the Java Extension pack shows when I install it on WSL.
I have been able to resolve this issue if I change the path in java.home to be same as JAVA_HOME in settings.json. However, I need to toggle the path back to C:\Program Files\Java\jdk-9.0.1 manually when working on my local machine and not on Remote-WSL.
Is there a better way to make it work?
PS: I've no clue why it says that JDK_HOME is empty. If I echo $JDK_HOME inside WSL, it shows the path same as JAVA_HOME.
If you want to develop Java in WSL, you need to install JDK in WSL. Now from the way you frame your questions I would assume you have done that (it needs to be installed as a Linux program, so if your JAVA_HOME starts with anything like /mnt/c then you don't actually have it on WSL).
I have been able to resolve this issue if I change the path in java.home to be same as JAVA_HOME in settings.json. However, I need to toggle the path back to C:\Program Files\Java\jdk-9.0.1 manually when working on my local machine and not on Remote-WSL.
The problem you mentioned here is relatively simple to solve. All you need to do is to have a WSL specific settings for java.home, and have the normal setting (i.e. C:\Program Files\Java\jdk-9.0.1) remain in your normal VS Code settings. To access WSL specific settings, use CTRL+SHIFT+P then type "Open Remote Settings".
Copied answer to one possible problem/solution from the Q above for visibility here:
I have been able to resolve this issue if I change the path in java.home to be same as JAVA_HOME in settings.json. However, I need to toggle the path back to C:\Program Files\Java\jdk-9.0.1 manually when working on my local machine and not on Remote-WSL.
Before installing the Java Extension Pack on the WSL side of things you should have something similar to this (so, yeah --> Click that button!):
i solved my problem running this comand on WSL
sudo apt install default-jdk
I think you should install JDK in WSL.
When I run
sudo apt install gzip
I get the following error:
Unable to locate an executable at "/Library/Java/JavaVirtualMachines/jdk-11.0.4.jdk/Contents/Home/bin/apt" (-1)
None of the solutions from other questions solves the problem.
I think that the apt tool is not present anymore in the java version you have.
Try using referece
npm install node-gzip --save
I suggest you read the original answer given by #Axel to a similar question.
For simplicity, I quote it here:
Sorry, I just saw what's wrong...
There used to be an apt tool in Java, but it's gone now. Your
mistake is using the linux command line. On many linux systems,
another tool called apt is used for installing software.
Check the npm documentation on how to install nom on your Mac, as
there are different ways to do it.
Once npm is installed, run sudo npm install -g express-generator
(no apt here).
Explanation of the error message
The Java apt-tool was removed in JDK 8. But as JAVA_HOME/bin is normally not on your PATH on Mac, apple provides simple wrappers
for all the commands under JAVA_HOME. There still is such a wrapper
for apt that tries to run a program with the same name from your
Java installation. That's why you get that error message.
conflict between the pre-installed macOS Java-Version and the Orcalce Java-Version:
Apple stopped pre-installing Java in macOS 10.7 so this should not be an issue.
difference between java_home and JAVA_HOME:
JAVA_HOME is an environment variable that points to your Java installation. java_home is a utility program in macOS that makes it
easier to correctly set up your JAVA_HOME by listing installed Java
versions and the values to use for JAVA_HOME.
why do I get this? How can I fix it?
C:\Users\ash>java version
Error: Registry key 'Software\JavaSoft\Java Runtime Environment'\CurrentVersion'
has value '1.7.0_01', but '1.7' is required.
Error: could not find java.dll
Error: Could not find Java SE Runtime Environment.
The accepted solution for Reinstalling ALL JDKs was a bit harsh.
I too experienced this problem and here is my 2 cents:
This problem started happening since I installed JDK 8 and still had JDK 6 installed. I need for different projects I'm working on.
I noticed I had both a User and a System %JAVA_HOME%, so I removed my User %JAVA_HOME% variable and left only the system one.
I also noticed that in my Oracle installation there was some Java executables and I believe those where the ones conflicting since both my Oracle and Java installations were in my %PATH% variable.
I removed all Java paths from my %PATH% Variable and only left the %JAVA_HOME%\bin at the start of the variable for avoiding any conflicts with the Oracle installation.
I had a similar issue after installing the java 1.8.
To fix this go to Advance System setting --> path and remove
C:\ProgramData\Oracle\Java\javapath;
Removing
C:\ProgramData\Oracle\Java\javapath;
work like charm
Reinstall JDK and set system variable JAVA_HOME on your JDK. (e.g. C:\tools\jdk7)
And add JAVA_HOME variable to your PATH system variable
Type in command line
echo %JAVA_HOME%
and
java -version
To verify whether your installation was done successfully.
I had a similar issue after installing the java 10.0
To fix this go to Advance System setting --> path and remove
C:\ProgramData\Oracle\Java\javapath;
I had to remove the Common Files javapath from the 'Path' that was conflicting, in order to make it work. Now thankfully the java -version works just fine.
C:\Program Files (x86)\Common Files\Oracle\Java\javapath
Make sure your JDK Path variable is directing to the \bin folder and is at the top of the list, because it always uses the first match. By moving it to the top you can make sure that no other path is matched first.
If there's any other entry that has a file called java (such as C:\ProgramData\Oracle\Java\javapath) it will run the command against that file instead of the java file in your JDK. There's no need to reinstall the entire JDK unless your files are corrupt or damaged for some reason.
This problem generally occurs in Windows when your "Java Runtime Environment" registry entry is missing or mismatched with the installed JDK. The mismatch can be due to multiple JDKs.
Steps to resolve:
Open the Run window:
Press windows+R
Open registry window:
Type regedit and enter.
Go to: \HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\
If Java Runtime Environment is not present inside JavaSoft, then create a new Key and give the name Java Runtime Environment.
For Java Runtime Environment create "CurrentVersion" String Key and give appropriate version as value:
Create a new subkey of 1.8.
For 1.8 create a String Key with name JavaHome with the value of JRE home:
Ref: https://mybindirectory.blogspot.com/2019/05/error-could-not-find-javadll.html
I edited my path to put the Oracle JDK at the start of the path and that fixed it.
Problem:
We had the same problem in our Windows 2012 server. We used JAVA_HOME environmental system variable, an we used in the PATH this kind of settings: ...%JAVA_HOME%/bin;...
and no other java related settings was in the PATH.
The problem was we had a space at the end of the value of the JAVA_HOME variable. Like 'C:\Program Files\Java\Jdk 1.8.0_172 ' so the %JAVA_HOME%/bin meant 'C:\Program Files\Java\Jdk 1.8.0_172 \bin'. So because the value was split by space and the system tried to find java.exe at 'C:\Program Files\Java\Jdk 1.8.0_172' where it is obviously not.
Solution was: Delete the space from the end of value of the JAVA_HOME !
Uninstall Java from machine
Check Java folder is deleted from Program Files
Check Registry does not have any instance of Java
Open system Variables and delete the ONLY java path from PATH
Now install the new version again.
Set the Path in System Variables.
This process cleans up all the traces of java and then install fresh java.
Note: This issues occurs when there is multiple installation and uninstall done.
You could be using a 32 bit version of java on a 64 bit environment.
Export the registry hive form HKLM\Software\JavaSoft and import into HKLM\Software\Wow6432Node\JavaSoft. For 1.6 I only needed JavaHome and RuntimeLib values.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Javasoft]
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Javasoft\Java Runtime Environment]
"CurrentVersion"="1.6"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Javasoft\Java Runtime Environment\1.6]
"JavaHome"="C:\\Java\\jre"
"RuntimeLib"="C:\\Java\\jre\\bin\\client\\jvm.dll"
None of the above worked for me, unfortunately.
The error solved when I uninstalled the old JDK versions that were installed on my computer. I did it simply with the "Uninstall or change a program" tool (under the Control Panel).
I removed the "C:\Program Files (x86)\Heroku\bin" from PATH variable and the problem has gone. I think it is probably the Heroku require different version of Java. So check all directories in your PATH variable, remove the possible ones may have confliction.
If you face this error in cmd with another error as "could not find runtime environment" after you have done all settings in Environment Variable. Then you just need to run jre.exe in your jdk folder and reinstall it and then recheck it by java -version command. Hope it will help you.
rename file "C:\Windows\System32\java.exe" to "C:\Windows\System32\java_old.exe"
CMD --> java -version
done.
In my case the regedit information was correct and the problem was solved by doing the below:
1) setting JAVA_HOME to jdk - set JAVA_HOME=C:\Program Files\Java\\bin
2) setting PATH to jre - set PATH="C:\Program Files\Java\\bin"
after adding the requirements path as illustrated up and deleting C:\ProgramData\Oracle\Java\javapath;. don't forget to reopen your editor.
Go to CMD and type the following:
SET PATH=C:\Program Files\Java\jdk1.8.0_291\bin
(here jdk1.8.0_291 represents your java version, it may differ for you)
I am building a project in Java.
I have this error:
Unable to locate tools.jar. Expected to find it in C:\Program Files\Java\jre6\lib\tools.jar
I have installed a JDK and the folder: C:\Program Files\Java\jre6\lib is in my system but the file tools.jar is not there.
Yes, you've downloaded and installed the Java Runtime Environment (JRE) instead of the Java Development Kit (JDK). The latter has the tools.jar, java.exe, javac.exe, etc.
In case this is still an issue for anyone, I have a bit of clarification on the previous answers. I was running into this same issue using ant with only a JDK installed. Although, the JDK installer gave me a directory structure like this:
Directory of C:\Program Files\Java
05/08/2012 09:43 AM <DIR> .
05/08/2012 09:43 AM <DIR> ..
05/08/2012 09:46 AM <DIR> jdk1.7.0_04
05/08/2012 09:19 AM <DIR> jre6
05/08/2012 09:44 AM <DIR> jre7
0 File(s) 0 bytes
and when I ran ant, it complained about not finding tools.jar under the jre7 subdirectory. It wasn't until I set "JAVA_HOME=C:\Program Files\Java\jdk1.7.0_04" that the error went away.
Install the Java SDK.
Add a System Environment Variable called JAVA_HOME with the value of JDK location.
Go to Control Panel\System and Security\System. Advanced System Settings, Environment Variables, System Variables, New... Example:
Variable Name:JAVA_HOME
Variable Value: C:\Program Files\Java\jdk1.7.0_21
Close/reopen your CMD window so that the new variable takes effect before attempting to re-run the ant command.
I had the same problem and copying C:\Program Files\Java\jdk1.6.0_26\lib\tools.jar to C:\Program Files\Java\jre6\lib\ext worked for me
If you have installed JDK 9.0.1 you will also have this problem as the tools.jar has been deprecated. See migration document.
Set your JAVA_HOME environmental variable to point to C:\Program Files\Java\jdk1.7.0_02.
If you are in Linux you can solve this by installing java on the system:
sudo apt-get install openjdk-7-jdk openjdk-7-jre
No, according to your directory structure, you have installed a JRE, not a JDK. There's a difference.
C:\Program Files\Java\jre6\lib
^^^^
It should be something like:
C:\Program Files\Java\jdk1.6.0_24
Don't spend too much time looking for tools.jar. If you get an error like that, don't be upset.
If you already have java JDK 1.5, go to your lib folder, and the tools.jar should be available there. Copy and paste it in your ant bin folder, then try to use the command ant -version.
You should see the expected result.
I had the same issue on a linux machine. I was quite frustrated at first, because I have installed both the JDK and JRE. I am using version 1.6, 1.7 and 1.8 simultaneously, and I have played a lot with the alternatives to have everything set properly.
The problem was quite stupid to solve, yet counter-intuitive. While I was using the correct JDK, I paid attention to the path of the tools jar maven complained about - it was expecting it to be
$JAVA_HOME\..\lib\tools.jar
The $JAVA_HOME variable pointed directly to my jdk folder (/usr/local/java which was also the correct $PATH entry and alternative sym link). It actually searches for the lib folder outside the java directory, because:
$JAVA_HOME\..\lib\tools.jar
will resolve to
/usr/local/lib/tools.jar
and that is not a valid location.
To solve this, the $JAVA_HOME variable should instead point to this location /usr/local/java/jre (assuming the JDK path is /usr/local/java) -- there is actually jre folder inside the JDK installation directory, that comes with each JDK. This new setup will cause maven to look at the JRE directory, that is part of the JDK:
$JAVA_HOME\..\lib\tools
which now resolves to
/usr/local/java/jre/../lib/tools.jar
and finally to
/usr/local/java/lib/tools.jar
which is where the tools.jar really resides.
So, even if you are indeed using the JDK instead of the JRE, the $JAVA_HOME has to point to the JRE. Remember, the OS alternative should still refer to the JDK.
go to your jdk path where you installed your java
For e.g In my PC JDK installed in the following path
"C:\Program Files\Java\jdk1.7.0_17\";
After go to the lib folder e.g "C:\Program Files\Java\jdk1.7.0_17\lib"
in the lib directory there is tool.jar file
Copy this file and past it in the lib forlder of jre7 directory
for e.g
"C:\Program Files\Java\jre7\lib"
You may face similar problem on Ubuntu:
Embedded error: tools.jar not found: /usr/lib/jvm/java-7-openjdk-amd64/jre/../lib/tools.jar
The problem is with JAVA_HOME that is not set properly.
So, on Ubuntu 14.04 x64 using Java8:
sudo apt-get install openjdk-8-jdk openjdk-8-jre
export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
As many people mentioned, it looks like you are looking in your JRE instead of the JDK for the tools.jar file.
I would also like to mention that on recent versions of the JDK, there is no more tools.jar file. I downloaded the most recent JDK as of today (JDK version 12) and I could not find any tools.jar. I had to download JDK version 8 (1.8.0) here https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html to get the tools.jar file. I downloaded that version, took the tools.jar file and put it into my recent version's lib folder.
It's worth observing that tools.jar has been removed from the JDK since Java 9. https://docs.oracle.com/javase/9/migrate/toc.htm#JSMIG-GUID-055EA9F4-835E-463F-B9E1-9081B3D9E55D
If people are facing this issue compiling a Java program with JDK 9+, you may need to review the dependencies of your projects.
In my case, I was trying to compile a project using AspectJ and the Maven plugin org.codehaus.mojo:aspectj-maven-plugin:1.11. After searching online, I found an alternative that supports Java 9+: dev.aspectj:aspectj-maven-plugin:1.13.M3.
I had the same problem even after installing Java JDK and set JAVA_HOME to ..\jdk1.6.0_45\bin folder.
Ant is still trying to find tools.jar in C:\Program Files\Java\jre6\lib folder.
I've fixed it by adding JAVACMD environment variable and set path for it to java.exe in the jdk folder.
In my case it was C:\Program Files\Java\jdk1.6.0_45\bin\java.exe
it has been solved with me in windows os by setting the JAVA_HOME variable before running as follows:
set JAVA_HOME=C:\Program Files\Java\jdk1.8.0_111
Make sure that both the %JAVA_HOME% and %JAVA_HOME%/bin paths are added to your PATH variable.
All the answers about copying tools.jar into the correct position is a poor idea at best.
Make sure that your IDE can find these jars the way it was designed and intended for.
In eclipse window> preferences>Java> Installed JRE, I pointed the directory to the jre directory in the jdk 1.7 and i worked file for me
e.g C:\Program Files\Java\jdk1.7.0_71\jre
I had my JDK_path (C:\Program Files\Java\jdk1.7.0_79) in my JAVA_HOME and also the JDK_path\bin in my PATH. But, still my ant was using the JRE instead of JDK.
The issue was I had C:\ProgramData\Oracle\Java\javapathbefore my JDK_path in PATH variable. I simply moved my JDK_path before the oracle one and the issue solved.
solving this problem I have simply copied the tools.jar file from C:\Program Files\Java\jre1.8.0_112\lib to C:\Program Files\Java\jdk1.8.0_112\lib so that I have two tools.jar files instead of one and problem disappeared.
Expected to find it in C:\Program Files\Java\jre6\lib\tools.jar
if you have installed jdk then
..Java/jdkx.x.x
folder must exist there so in stall it and give full path like
C:\Program Files\Java\jdk1.6.0\lib\tools.jar
Make sure that your classpath is set correctly and pointing to the correct version of the JDK that you have installed. Also, are you using Open JDK? I have had this issue before after I tried to move from open JDK to Suns JDK. This is an example of how that issue could be fixed.
maven-compiler-plugin use jdk ,not jre,
tools.jar is in C:\Program Files\Java\jdk1.6.0\lib\tools.jar
you must config project JRE System Libary with jdk,not jar. This is the simplest solution.
Right click on your ant file
Go to "Run as" then click on "Ant Build..."
Go to the "JRE" tab
Select a JDK and not a JRE
For me what's working: I downloaded an old version of Java 1.7
I actually set my JAVA_HOME from C:/program files X86/Java BUT after I installed the 1.7 version I had another Java in program files/Java. And at this moment I found the tools.jar here. Then I changed for this new path and it's working
I was also facing the same error.
This was removed after setting Java_Home path to C:\Program Files\Java\jdk1.8.0_121.
Please ensure bin is not included in the path and no slash is there after jdk1.8.0_121 after you have defined %JAVA_HOME%\bin in the system path variable.
If you're in a RHEL environment the package name containing tools.jar would end with "openjdk-devel".
This is the solution for Windows: in Computer > Advanced system settings > Advanced > Environment variables..., add this in System variables:
I have downloaded tools.jar and after that I copied it into path in error message.
C:\Program Files\Java\jdk-11.0.1\bin > paste here tools.jar
After that I have restarted Spring Tool Suit 4 and everything was working.
When I was trying to fix that problem I have made new environmental variable:
Control Panel / System / Advenced / Environmental variables / new
Name : JAVA_HOME
Value: C:\Program Files\Java\jdk-11.0.1
But I do not know is it necessary.
maybe you have updated the JREs in the OS, and the addition has added in the "path" of the environment variables an entry ".../Oracle/jer" that overwrites your JAVA_HOME.
try to remove it from the "path" by leaving JAVA_HOME.
I have recently downloaded Maven and followed the instructions given on this this page. I already have ant installed on my machine.
Now, if I want to verify that Maven is installed perfectly or not it is giving me error that JAVA_HOME is not set correctly, but same works perfectly fine for ANT.
For Maven I tried :
1. open cmd
2. type mvn -version
3. Error appeared :
C:\Users\Admin>mvn -version
ERROR: JAVA_HOME is set to an invalid directory.
JAVA_HOME = "C:\Program Files\Java\jre7\bin"
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation
For ANT I tried and worked :
1. open cmd
2. type mvn -version
3. Apache Ant(TM) version 1.9.1 compiled on May 15 2013
I went to the directory to check that java.exe is actually there in that directory or not and it was there. I checked the environment variables they set fine. I restarted the system and checked again but same problem. Please let me know what am I missing.
JAVA_HOME should point to jdk directory and not to jre directory. Also JAVA_HOME should point to the home jdk directory and not to jdk/bin directory.
Assuming that you have JDK installed in your program files directory then you need to set the JAVA_HOME like this:
JAVA_HOME="C:\Program Files\Java\jdkxxx"
xxx is the jdk version
Follow this link to learn more about setting JAVA_HOME:
http://docs.oracle.com/cd/E19182-01/820-7851/inst_cli_jdk_javahome_t/index.html
Do not include bin in your JAVA_HOME env variable
Follow the instruction in here.
JAVA_HOMEshould be like this
JAVA_HOME=C:\Program Files\Java\jdk1.7.0_07
JAVA_HOME = C:\Program Files\Java\jdk(JDK version number)
Example: C:\Program Files\Java\jdk-10
And then restart you command prompt it works.
Just remember to add quotes into the path if you have a space in your path to java home.
C:\Program Files\java\javaxxx\ doesn't work
but
"C:\Program Files\java\javaxxx\" does.
The JAVA_HOME should point to the JDK home rather than the JRE home if you are going to be compiling stuff, likewise - I would try and install the JDK in a directory that doesn't include a space. Even if this is not your problem now, it can cause problems in the future!
You are pointing your JAVA_HOME to the JRE which is the Java Runtime Environment. The runtime environment doesn't have a java compiler in its bin folder.
You should download the JDK which is the Java Development Kit. Once you've installed that, you can see in your bin folder that there's a file called javac.exe. That's your compiler.
JAVA_HOME should point to jdk directory like in the image with new variable, like below
PATH should point to jdk bin like below
Run the below command in your terminal and restart it.
> set JAVA_HOME="C:\Program Files\Java\jdk-xx.xx"
xx.xx is the java version