I'm attempting to generate a Maven project via VSCode's Maven for Java extension.
Here's my issue: After I click "Create new Maven Project" in the Explorer, choose the quickstart option, and choose the folder I want to work in, I am given an error in terminal which reads as follows:
Error: JAVA_HOME not found in your environment.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation.
Currently, my JAVA_HOME system variable is set as C:\Progra~1\Java\jdk1.8.0_271.
Any suggestions for how to make this error go away? I'm not sure if it matters, but my JDK is installed on my C drive and I am attempting to create a project on my M drive.
Thanks!
1.Add java to PATH:
Control Panel-> System-> Advanced system settings-> Environment
Variables:
Under User variables, Choose Path, click New:
Copy the path of the JDK bin directory.
Open Command Prompt, and run java --version. If there's no error
shown and you get the right jdk information, turn to the next step;
2.Install Java Extension Pack in VS Code;
3.Press Ctrl+Shift+P to open Command Platte and choose Java: Configure Java Runtime:
Turn to Java Tooling Runtime and select your installed jdk, JDK
for Language Server is equivalent to java.home:
Then reload VS Code to make change effective.
The solution to this problem was setting both a user Path variable and a new system variable "JAVA_HOME" specifically to the address of the bin folder of my Java 11 installation.
In my case the path looked like this:
C:\Program Files\AdoptOpenJDK\jdk-11.0.8.10-hotspot\bin
I have a hunch that my issue may have related to the fact that I have two JDKs installed- one for Java 8 and one for Java 11- but I'm not sure.
Thank you to those who helped!
I have manage to configure this entirely through Visual Studio Code. Using the reference for the Maven extension: https://marketplace.visualstudio.com/items?itemName=vscjava.vscode-maven
I set my Java home path in Visual Studio Code, like this (inside of settings.json):
"java.home": "C:\\Program Files\\Java\\jdk-9.0.4"
And then you can enable Maven to use the same path with the settings below:
"maven.terminal.useJavaHome": true
I am newbie to MAC platform.
I need to know if I really need to set JAVA_HOME path on MAC OS.
Previously I have used windows and from what I have learned is, user need to specify JAVA_HOME path in "Environmental Variables" so that the system will know if JAVA is really installed in computer.
But is such thing not mandatory to do in MAC?. Can I code right away after java installation?
Can someone explain
NO,
you don't have to set JAVA_HOME path to run java code in eclipse. Though to run the code you will have to set the Run configuration, and specify the JRE you want to be used, to run the code (under JRE tab of Run Configuration). Here you will browse and point your system to access the required (Installed) JRE.
Though if you set JAVA_HOME path, you would be able to call the compile and run for java code from command line (Terminal) as well. and Eclipse will also pick the same without setting it up explicitly.
You can code right away; the eclipse oomph installer will hardcode a link to the location of your java vm for you in eclipse's config, which means eclipse will start regardless of your PATH or JAVA_HOME variables.
When running java apps from within eclipse, eclipse has its own registration of where java vms live. You can install various versions of java; you can tell eclipse about any or all of them and pick the VM that goes with a given project (the default is in windows | preferences, search for 'jre' in the filter – and you can also override this default in the project; right click on a project and select properties).
Any attempt to run stuff within the project will use the project's configured VM, and if there isn't one, the default as configured in the window|preferences dialog.
Millions of programmers have been able to do this; is there something so obvious as the nose on my face, which I'm missing here?
I've been using TextPad with Java for a dozen years. Everytime Windows changes versions, I have to reinstall them. Somehow, TextPad finds Java and I'm all set.
I don't know about PATH or environment variables (maybe this is the thing everyone else knows and I don't).
Anyway, I downloaded eclipse 1.7 and copied the files from the ZIP into C:\eclipse on my Windows 7 (64-bit version) machine. There are NO INSTALLATION INSTRUCTIONS in the download or at eclipse.org!
What am I supposed to put on a command line (for a batch file) on in the eclipse.ini file to allow Eclipse to find the Java virtual machine?
The location of javaw.exe
The path of jvm.ell
... or what?
=> Tell me how, and I'll make a web page dedicated to this!!!
How about http://wiki.eclipse.org/FAQ_How_do_I_run_Eclipse%3F ?
Normally with a properly installed JRE, Eclipse will just run because the javaw.exe and java.exe proxies are added to your windows folder which is always in the path. But alternatively you can make eclipse use any other JRE/JDK by editing the eclipse.ini file and adding the following lines at the top of the file:
-vm
<path to jdk or jre>
Windows > Preferences > Java > Installed JREs lets you configure any number of JREs.
The online doc (accessible from Help > Help contents or on the web) explains this and all other settings.
Hope that helps.
I have a new laptop and attempted to install jdk-1_5_0_22-windows-amd64, jdk-1_5_0_22-windows-i586-p and jdk-6u22-windows-i586 without success.
I have used java before and I am familiar with environment variables.
However I cannot get the java version at command prompt or the java compiler to work.
Also I am using Blackberry JDE and it does not find the installed version to build.
Can anyone help me?
Add the path to the Java bin folder to your PATH environment variable.
In order to run any java from the command line, the bin folder of the java installation must be added to the PATH environment variable. Without this, the command prompt cannot find your java installation, so it cannot run your files. Make sure to open a new copy of the command line after you set the environment variable.
Right click on My Computer and choose Properties. Choose the Advanced tab, and then the Environment Variables button. There should be a "Path" under system variables. Add a semicolon to the end and add the path to your installation's bin folder after that.
I would imagine that the Blackberry JDE makes use of the JAVA_HOME variable. I am guessing that it is not set so the JDE doesnt know where to look on the file system.
I think that Erick is correct in verifying that the bin directory has been added to the PATH. If you used the installer, you might need to reboot your machine.
Finally, the JDE appears to be a slightly aged package. I cannot seem to find the statement saying that the Blackberry JDE supports 64 bit java.
I am trying to sign a jar file using an ANT script. I know this has to be pointed at the JDK directory for jarsigner.exe to run, but when I echo java.home it returns the JRE directory.
This isn't a problem for javac, because I can set the executable path. But, that does not exist for signjar.
How do I change the java.home path? When I right-click on MyComputer and go to:
Properties > Advanced > Environment Variables
The "PATH" variable is correctly pointed to the JDK (C:\program files\java\jdk\bin).
Update: The file now signs correctly after changing the PATH variable suggested below.
In Eclipse the Ant java.home variable is not based on the Windows JAVA_HOME environment variable. Instead it is set to the home directory of the project's JRE.
To change the default JRE (e.g. change it to a JDK) you can go to Windows->Preferences... and choose Java->Installed JREs.
To change just a single project's JRE you can go to Project->Properties and choose Java Build Path and choose the Libraries tab. Find the JRE System Library and click it, then choose Edit and choose the JRE (or JDK) that you want.
If that doesn't work then when running the build file you can choose Run as->Ant Build... and click the JRE tab, choose separate JRE and specify the JRE you want there.
For me, ant apparently refuses to listen to any configuration for eclipse default, project JDK, and the suggestion of "Ant Home Entries" just didn't have traction - there was nothing there referring to JDK.
However, this works:
Menu "Run" -> "External Tools" -> "External Tools Configuration".
Goto the node "Ant build", choose the ant buildfile in question.
Choose tab "JRE".
Select e.g. "Run in same JRE as workspace", or whatever you want.
Under Windows you need to follow:
Start -> Control Panel -> System -> Advanced -> Environment Variables.
... and you need to set JAVA_HOME (which is distinct from the PATH variable you mention) to reference the JDK home directory, not the bin sub-directory; e.g. "C:\program files\java\jdk".
Simply, to enforce JAVA version to Ant in Eclipse:
Use RunAs option on Ant file then select External Tool Configuration in JRE tab define your JDK/JRE version you want to use.
Also be sure to set your JAVA_HOME environment variable. In fact, I usually set the JAVA_HOME, then prepend the string "%JAVA_HOME%\bin" to the system's PATH environment variable so that if Java ever gets upgraded or changed, only the JAVA_HOME variable will need to be changed.
And make sure that you close any command prompt windows or open applications that may read your environment variables, as changes to environment variables are normally not noticed until an application is re-launched.
In addition to verifying that the executables are in your path, you should also make sure that Ant can find tools.jar in your JDK. The easiest way to fix this is to add the tools.jar to the Ant classpath:
If you are using Eclipse, try the following:
Right click on the ant build file, then choose "Properties".
Click on the "Run/Debug Settings", then click on the launch configuration file. You should be able to edit it then.
After you click "Edit", you should see a new window with a "Properties" tab which will show you a list of Ant build properties. There is a "java.home" property in the list. Make sure it refers to the correct path.
Spent a few hours facing this issue this morning. I am likely to be the least technical person on these forums. Like the requester, I endured every reminder to set %JAVA_HOME%, biting my tongue each time I saw this non luminary advice. Finally I pondered whether my laptop's JRE was versions ahead of my JDK (as JREs are regularly updated automatically) and I installed the latest JDK. The difference was minor, emanating from a matter of weeks of different versions. I started with this error on jdk v 1.0865. The JRE was 1.0866. After installation, I had jdk v1.0874 and the equivalent JRE. At that point, I directed the Eclipse JRE to focus on my JDK and all was well. My println of java.home even reflected the correct JRE.
So much feedback repeated the wrong responses. I would strongly request that people read the feedback from others to avoid useless redundancy. Take care all, SG
Go to Environment variable and add
JAVA_HOME=C:\Program Files (x86)\Java\jdk1.6.0_37
till jdk path (exclude bin folder)
now set JAVA_HOME into path as PATH=%JAVA_HOME%\bin;
This will set java path to all the applications which are using java.
For ANT use,
ANT_HOME=C:\Program Files (x86)\apache-ant-1.8.2\bin;
and include ANT_HOME into PATH, so path will look like PATH=%JAVA_HOME%\bin;%ANT_HOME%;
Set environment variables
This is the part that I always forget. Because you’re installing Ant by hand, you also need to deal with setting environment variables by hand.
For Windows XP: To set environment variables on Windows XP, right click on My Computer and select Properties. Then go to the Advanced tab and click the Environment Variables button at the bottom.
For Windows 7: To set environment variables on Windows 7, right click on Computer and select Properties. Click on Advanced System Settings and click the Environment Variables button at the bottom.
The dialog for both Windows XP and Windows 7 is the same. Make sure you’re only working on system variables and not user variables.
The only environment variable that you absolutely need is JAVA_HOME, which tells Ant the location of your JRE. If you’ve installed the JDK, this is likely c:\Program Files\Java\jdk1.x.x\jre on Windows XP and c:\Program Files(x86)\Java\jdk1.x.x\jre on Windows 7. You’ll note that both have spaces in their paths, which causes a problem. You need to use the mangled name[3] instead of the complete name. So for Windows XP, use C:\Progra~1\Java\jdk1.x.x\jre and for Windows 7, use C:\Progra~2\Java\jdk1.6.0_26\jre if it’s installed in the Program Files(x86) folder (otherwise use the same as Windows XP).
That alone is enough to get Ant to work, but for convenience, it’s a good idea to add the Ant binary path to the PATH variable. This variable is a semicolon-delimited list of directories to search for executables. To be able to run ant in any directory, Windows needs to know both the location for the ant binary and for the java binary. You’ll need to add both of these to the end of the PATH variable. For Windows XP, you’ll likely add something like this:
;c:\java\ant\bin;C:\Progra~1\Java\jdk1.x.x\jre\bin
For Windows 7, it will look something like this:
;c:\java\ant\bin;C:\Progra~2\Java\jdk1.x.x\jre\bin
Done
Once you’ve done that and applied the changes, you’ll need to open a new command prompt to see if the variables are set properly. You should be able to simply run ant and see something like this:
Buildfile: build.xml does not exist!
Build failed