You have to install the full JDK, not only the JRE.

I had the same issue and solved by installing JDK.

Please use this link to download the latest JDK version 22.

It seems that you are missing Java environment variable to make your program work.

What you can try:

Solution 1

Try to run caver_analyst with the --jdkhome switch, followed by (I guess) the path to a valid JDK as suggested in your error message. It should solve your problem.

Solution 2

Usually, the path to Java must be defined in a JAVA_HOME environment variable. Yours is obviously not defined, so let's define it manually :

1. Open a Terminal
2. Go to your home directory with command cd
3. Look for a file called ".zshrc" in this directory:

you@yourmac ~ % ls .zshrc
.zshrc

4. If it does not exist i.e. if the command ls .zshrc gives you a "No such file or directory" message, create the file: touch .zshrc
5. Get the path to Java and keep it somewhere : which java
6. Open the newly created file (it's a hidden file so you will have to show hidden files. Alternatively, you can edit the file in command line with nano .zshrc)
7. At the end of the file, add the following line : export JAVA_HOME="/Path/to/your/java/home" and replace /Path/to/your/java/home with the path that you got at step 5.
8. Save, close the file, reboot your laptop.

This file will be automatically read and its instructions executed when you open your profile. The "export" instruction creates an environment variable. You can verify if it was successfully created with echo $JAVA_HOME, echo being a command to display something. The "$" in front of the variable tells echo to look for a variable.

I hope this helps, but if it doesn't, please don't hesitate to share the error messages and step where it fails here...

I also ran into this today.

After installing openjdk with brew install openjdk, I got this too:

java --version

The operation couldn’t be completed. Unable to locate a Java Runtime.
Please visit http://www.java.com for information on installing Java.

It seems there is already system-wide default java command/alias (I had no previous Java install), so let's show the details:

which java

/usr/bin/java

However reading the output of the brew install log one can see:

==> openjdk

For the system Java wrappers to find this JDK, symlink it with
  sudo ln -sfn /opt/homebrew/opt/openjdk/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk.jdk

so, if you do not have another existing Java system-wide installation just run (and type your mac user password):

sudo ln -sfn /opt/homebrew/opt/openjdk/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk.jdk

Password:

Now it works:

java --version

openjdk 21.0.2 2024-01-16
OpenJDK Runtime Environment Homebrew (build 21.0.2)
OpenJDK 64-Bit Server VM Homebrew (build 21.0.2, mixed mode, sharing)

Turns out java has been moved into brew core recently, so the correct command as of August 2022 is:

brew install java

Then check your installation by running

java -version

If the result does not looks like this:

openjdk 18.0.2 2022-07-19
OpenJDK Runtime Environment Homebrew (build 18.0.2+0)
OpenJDK 64-Bit Server VM Homebrew (build 18.0.2+0, mixed mode, sharing)

but like this:

The operation couldn’t be completed. Unable to locate a Java Runtime.
Please visit http://www.java.com for information on installing Java.

Then you also need to create a symlink for the system Java wrappers to find this JDK:

sudo ln -sfn /opt/homebrew/opt/openjdk/libexec/openjdk.jdk \
     /Library/Java/JavaVirtualMachines/openjdk.jdk

The answer to your question can be found by running:

brew info openjdk@11

Part of the output is:

For the system Java wrappers to find this JDK, symlink it with
  sudo ln -sfn /opt/homebrew/opt/openjdk@11/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk-11.jdk

openjdk@11 is keg-only, which means it was not symlinked into /opt/homebrew,
because this is an alternate version of another formula.

If you need to have openjdk@11 first in your PATH, run:
  echo 'export PATH="/opt/homebrew/opt/openjdk@11/bin:$PATH"' >> ~/.zshrc