export java_home inconsistent type for assignment

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JAVA_HOME is not set correctly after adding and appending to PATH

Ubuntu 14.04 LTS Bash version 4.3.11(1)-release

I've added $JAVA_HOME to ~/.profile (and .bash_profile) like this:

But still typing echo $JAVA_HOME yields:

• The most likely explanation is that JAVA_HOME is set again later in the initialisation file sequence. Try grep JAVA_HOME .profile .bash* to check. However, JAVA_HOME=$(/usr/bin/java) is wrong: this sets JAVA_HOME to the first token in the output from running /usr/bin/java , but this generates help text on standard error and nothing on standard output, so JAVA_HOME is set to an empty string. –  AFH Nov 14, 2018 at 14:07

Using the variable assignment with a $() tells Linux to do a command substitution. So, it is trying to run the command /usr/bin/java and assign the output to the variable.

You should use:

Then to make the new variables live, execute your profile script:

Note the extra . at the beginning. Without it the variable assignment would only persist within the scope of the script.

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Chapter 5. configuring the java_home environment variable on rhel.

Some applications require you to set the JAVA_HOME environment variable so that they can find the Red Hat build of OpenJDK installation.

Prerequisites

• You know where you installed Red Hat build of OpenJDK on your system. For example, /opt/jdk/11 .

Set the value of JAVA_HOME .

Verify that JAVA_HOME is set correctly.

You can make the value of JAVA_HOME persistent by exporting the environment variable in ~/.bashrc for single users or /etc/bashrc for system-wide settings. Persistent means that if you close your terminal or reboot your computer, you do not need to reset a value for the JAVA_HOME environment variable.

The following example demonstrates using a text editor to enter commands for exporting JAVA_HOME in ~/.bashrc for a single user:

Additional resources

• Be aware of the exact meaning of JAVA_HOME . For more information, see Changes/Decouple system java setting from java command setting .

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How to set JAVA_HOME environment variable on Windows 10

Here, the home of JDK is under C:\Program Files\Java\jdk1.80_201 . The version number may vary, depending on the JDK you installed.

The System Properties dialog appears, click the button Environment Variables .

Then you will see this dialog:

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How to set JAVA_HOME for Java?

I've installed a version of Java. How can we set the $JAVA_HOME environment variable correctly?

4 Answers 4

You can set your JAVA_HOME in /etc/profile as Petronilla Escarabajo suggests. But the preferred location for JAVA_HOME or any system variable is /etc/environment .

Open /etc/environment in any text editor like nano or gedit and add the following line:

(java path could be different)

Use source to load the variables, by running this command:

Then check the variable, by running this command:

Usually most linux systems source /etc/environment by default. If your system doesn't do that add the following line to ~/.bashrc (Thanks @pje)

• 2 When i tried to run Android Studio (that has IntelliJ IDEA as a base), i had an error message very similar to @advocate's: "'tools.jar' seems to be not in Android Studio classpath." After fiddling a lot with JAVA_HOME without success, i decided to take a look at studio.sh, the shellscript that starts Android Studio. As a wild guess, i set JDK_HOME to the same value expected for JAVA_HOME, and voila! It installed without great problems. –  Hilton Fernandes Mar 7, 2015 at 23:20
• 6 For those doing software development, don't put your JAVA_HOME in /etc/environment unless you want to reboot everytime you switch JDK versions. –  Dave Sep 20, 2016 at 19:03
• 3 This is a temporary solution, as others pointed out. No one would want to run source every time they restart their bash. –  yuranos Feb 19, 2017 at 21:49
• 7 As others have pointed out, this doesn't stick between terminal sessions. What I did to address this is just added the line source /etc/environment to the top of my bash config file ~/.bashrc so that it loads all my environment settings on startup. Working for me so far. –  pje Mar 11, 2017 at 22:31
• 2 @sedulam I updated the answer –  Manula Waidyanatha Apr 20, 2017 at 6:20

To set JAVA_HOME environment variable, do the following:

• Launch Terminal by pressing Ctrl + Alt + T on your keyboard.
• Enter the following command: $ gksudo gedit /etc/environment
• Depending on where you installed your Java, you will need to provide the full path. For this example, I installed Oracle JDK 7 in the /usr/lib/jvm/java-7-oracle directory. Scroll to the end of the file and enter the following: JAVA_HOME=/usr/lib/jvm/java-7-oracle export JAVA_HOME
• Save your file and exit gedit .
• Lastly, reload the system PATH with the following command: $ . /etc/environment

The above method will save you the hassle in having to run the commands every time you log in to your computer.

• 7 How does . /etc/environment work? –  Sudip Bhandari Sep 13, 2016 at 13:36
• 1 Is the addition of the export command necessary in the /etc/environment ? –  pkaramol Nov 23, 2016 at 10:01
• @pkaramol I've had to add export JAVA_HOME on 16.04LTS to make it load at startup. –  adeen-s Jan 20, 2017 at 6:20
• 4 @adeen-s You added export to a line in /etc/environment and it helped? That file contains variable definitions parsed as = -delimited name-value pairs; its contents are not executed as commands. (See man pam_env .) So unless you're separately treating the file as though it were a script (such as by passing /etc/environment to bash's . / source builtin), I wouldn't expect that to work. –  Eliah Kagan Aug 17, 2017 at 16:02
• 1 > How does . /etc/environment work? -- . (dot) loads commands from a file askubuntu.com/a/232938/189965 –  Roman Bekkiev Sep 22, 2018 at 7:32

If you do not know the path and you only have openJDK installed, you can type update-alternatives --config java and you should find the path. To set the variable you can write JAVA_HOME=<PATH> followed by export JAVA_HOME . Notice there's no space when declaring the variable. To check if the variable is stored you simply type echo $JAVA_HOME to verify.

• 1 This seems like it would be static. If I remove openjdk-7 and install openjdk-9, won't the JAVA_HOME then point to the wrong place? How can it be made dynamic? –  DavidJ Jul 20, 2016 at 18:49
• 3 By you manually changing it. Once again, YOU are the way it becomes dynamic.... –  Dave Sep 20, 2016 at 19:04
• What @HDave means is that In certain cases, you may want JAVA_HOME to point to a specific java version, so making the update of JAVA_HOME dynamic may not be what you want. –  Maciej Oct 9, 2016 at 15:31
• i like this answer. I tested with echo and see my path. However, I am confused why I am still getting JAVA_HOME environment variable is not set when I run mvn -version –  Winnemucca Apr 11, 2017 at 22:19
• 3 I wrote this answer back when I was more ignorant. Setting the variable as described will only affect your current terminal session, and will not be persisted. The correct way is to run update-alternatives --install <link> <name> <target> <priority> for example: update-alternatives --install /usr/bin/java java /usr/lib/jvm/default-runtime/bin/java 1 –  Erro May 14, 2017 at 12:26

This is the best option if you always want to use the latest one installed. Nowadays (Ubuntu 23.10) you should probably have it installed through apt like:

In this case, you should find it at /usr/lib/jvm/default-java . It's a symlink that points to whichever the current JVM is on the same folder. So, just run this to add the environment as a separate file:

Add this line and save:

Then reboot or login again, or source /etc/environment.d/90java.conf to load it on the current shell.

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Fixing "zsh: bad assignment" error in Linux

The other day I was trying to create an alias in Linux for repetitive commands. An alias is a name that is translated as another name or command (or a set of commands).

So, I tried to create the alias in the following manner:

And it threw me the following error:

If you are a regular user of the Linux command line, you must have identified the error on the previous command. But I was preoccupied with my program in C++ and I did not notice the obvious error here.

In fact, I thought it to be an error with the way I used the combination of error for the alias. So, I fiddled for a couple of minutes and just to make sure what I was doing wrong, tried this command:

Now, I was certain that there was no error with the commands this time but I git the same result as above:

And that’s when I realized my mistake. You see, I have been working a lot with C++ and was following the standard of using spaces before and after the assignment operator (=). And that is what I used here as well. And shell does not like the wastage of “space”.

I removed the extra white spaces before and after the = and voilà! There it worked like a charm.

In fact, the same error can be encountered with the export command as well or any other variable assignments in the shell. There should not be spaces before and after equals sign.

This taught me a lesson to not waste white space while dealing with shell scripts and Linux commands. It’s not the same as writing programs in other languages.

I would add this tiny learning lesson to my list of things to know about the Linux terminal.

I hope you would not have to waste your time with this problem if you mind those spaces before and after the equals sign.

Abhishek Prakash

Created It's FOSS 11 years ago to share my Linux adventures. Have a Master's degree in Engineering and years of IT industry experience. Huge fan of Agatha Christie detective mysteries 🕵️‍♂️

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JAVA_HOME: inconsistent type for assignment, why this issue occurs after updating the JAVA_HOME in zshrc and how to fix it?

I am switching between java 8 and java 11 for some reason recently after updating the JAVA_HOME, I see a problem in IntelliJ IDEA for my Gradle project. so I am trying from scratch to setup java in Mac. but stuck with this inconsistent issue.

Process 'command '/Applications/IntelliJ IDEA CE.app/Contents/jbr/Contents/Home/bin/java'' finished with non-zero exit value 1

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