Setting JAVA_HOME and PATH variables¶

Windows¶

We’ll explain here how to set up JAVA_HOME and PATH variables on Windows.

Setting the JAVA_HOME variable¶

Open Search and type “advanced system settings” and hit Enter.
Find the Advanced tab and click on the Environment Variables.
In the System variables section click on New if you want to set JAVA_HOME system wide. To set JAVA_HOME for a single user click on New under User variables.
In the opened modal window for Variable name type JAVA_HOME and for the Variable value set the path to the JDK installation. Click OK once you’re done.
Click OK and click Apply to apply the changes.

Setting the PATH variable¶

If you have downloaded and installed the DAML SDK using our Windows installer your PATH variable is already set up.

Mac OS¶

We’ll explain here how to set up JAVA_HOME and PATH variables on Mac OS with zsh shell. If you are using bash all of the instructions are quite similar, except that you will be doing all of the changes in the .bash_profile file.

Setting the JAVA_HOME variable¶

Run the following command in your terminal:

echo 'export JAVA_HOME="$(/usr/libexec/java_home)"' >> ~/.zprofile

Setting the PATH variable¶

Run the following command in your terminal:

echo 'export PATH="$HOME/.daml/bin:$PATH"' >> ~/.zprofile

Verifying the changes¶

In order for the changes to take effect you will need to restart your computer, or, if you’re using the macOS Terminal app, you only need to quit the Terminal app (Command+Q in the Terminal window) and reopen it. Afterward, please follow the instructions below to verify that everything was set up correctly.

Please verify the JAVA_HOME variable by running:

echo $JAVA_HOME

You should see the path to the JDK installation, which is something like /Library/Java/JavaVirtualMachines/jdk_version_number/Contents/Home.

Next, please verify the PATH variable by running:

echo $PATH

You should see a series of paths which includes the path to the DAML SDK, which is something like /Users/your_username/.daml/bin.

If you do not see the changes, you may be using bash as your default shell instead of zsh. Please try these instructions again, but replace the ~/.zprofile with ~/.bash_profile in the commands above.

Linux¶

We’ll explain here how to set up JAVA_HOME and PATH variables on Linux for bash.

Setting the JAVA_HOME variable¶

Java should be installed typically in a folder like /usr/lib/jvm/java-version. Before running the following command make sure to change the java-version with the actual folder found on your computer:

echo "export JAVA_HOME=/usr/lib/jvm/java-version" >> ~/.bash_profile

Setting the PATH variable¶

Run the following command:

echo 'export PATH="$HOME/.daml/bin:$PATH"' >> ~/.bash_profile

Verifying the changes¶

In order for the changes to take effect you will need to restart your computer. After the restart, please follow the instructions below to verify that everything was set up correctly.

Please verify the JAVA_HOME variable by running:

echo $JAVA_HOME

You should see the path you gave for the JDK installation, which is something like /usr/lib/jvm/java-version.

Next, please verify the PATH variable by running:

echo $PATH

You should see a series of paths which includes the path to the DAML SDK, which is something like /home/your_username/.daml/bin.